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REVIEW 2 major objections 5 minor 54 references

Ultrafast electron heating as the dominant driving force of photoinduced terahertz spin currents

T0 review · 2 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash

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Pith's one-line read Photon energy does not change terahertz spin current dynamics across a wide range of magnetic stacks.

desk verdict The dynamics null result is solid and broadens the wavelength-insensitivity claim to new material classes, but the amplitude part of the claim is weakened by a normalization factor that may absorb the very efficiency change under test. read the letter →

arxiv 2507.00977 v1 pith:KEI3OCFT submitted 2025-07-01 cond-mat.mes-hall

Reza Rouzegar , Pilar Jimenez-Cavero , Oliver Gueckstock , Mohamed Amine Wahada , Quentin Remy , Irene Lucas , Gerhard Jacob , Mathias Kläui
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Michel Hehn Georg Woltersdorf Tobias Kampfrath Tom. S. Seifert
This is my paper · ORCID
classification cond-mat.mes-hall
keywords terahertzspincurrentsultrafastspintronicsphoton-energydependenceelectronheatingSeebeckeffectpyrospintronicemissionspectroscopyferrimagneticinsulators
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper sets out to settle whether the photon energy of the excitation pulse controls the initial step of terahertz spin current generation in ferromagnet/heavy-metal stacks. By comparing 1.5 eV and 3 eV pump pulses on a deliberately broad family of systems (metallic ferromagnets, ferrimagnetic insulators, half-metals, rare-earth alloys, and MgO tunnel barriers), it finds that the emitted THz waveforms are essentially identical in shape and only mildly different in amplitude. The authors conclude that the dominant driving force is ultrafast heating of the electron system by the pump, while highly excited primary photoelectrons contribute less than the noise floor. If true, the microscopic generation step is controlled by how much energy is deposited into the electrons, not by the energy of each photon.

What carries the argument

The central object is the terahertz spin current emitted by an F|HM bilayer and detected by electro-optic sampling as the magnetization-odd THz signal $S(t) = [S(t,+M_0)-S(t,-M_0)]/2$. The comparison loop is: 1.5 eV pulses from a Ti:sapphire oscillator, 3 eV pulses by second-harmonic generation in a BBO crystal with identical beam geometry, signals normalized by absorbed pump fluence, and 3 eV traces scaled by a factor stated to absorb absorption differences, setup sensitivity, and possibly injection efficiency. The two generation laws under test are the spin Seebeck relation $j_s^{SSE} \propto (T_e^{HM}-T_{mag}^{FI})$ and the pyrospintronic relation $j_s^{PSE} \propto (\mu_s^{HM}-\mu_s^{FM})$; the invariance across photon energy is what pins the driving force to electron heating.

What would settle it

Measure the absolute THz amplitude per absorbed photon at 1.5 eV and 3 eV with the detection transfer function calibrated independently for each wavelength. If the ratio at equal absorbed energy differs from unity by more than the experiment's ~1% noise floor, then at least part of the photon-energy dependence was being absorbed into the normalization factor, and the amplitude part of the claim fails. A second falsifier: observe any wavelength-dependent dynamics, such as an extra slow component when 3 eV excites 4f states in Tb30Fe70, in a higher signal-to-noise version of the same measurement.

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Extended reading notes

Core claim

The central claim is that, in all F|HM stacks studied, switching the pump photon energy from 1.5 eV to 3 eV leaves the dynamics of the generated terahertz spin currents unchanged and changes only the amplitude slightly, once traces are normalized by absorbed fluence and a trace-specific factor. This is presented as evidence that the spin Seebeck effect (driven by the electronic temperature difference between HM and magnetic layer) and the pyrospintronic effect (driven by a transient spin-voltage difference) are set by the hot-electron population near the Fermi level, not by the initially excited photoelectrons. Cases engineered to be sensitive to photon energy—above-gap excitation of maghemite and magnetite, direct 4f excitation in Tb30Fe70, and resonant tunneling through MgO defect states—all show the same insensitivity.

Load-bearing premise

The conclusion rests on the assumption that the normalization factor applied to the 3 eV traces accounts only for absorption and setup sensitivity, not for genuine photon-energy-dependent changes in spin-current generation efficiency; if it quietly absorbs such changes, the amplitude comparison is circular.

Editorial extensions

If this is right

  • Spintronic THz emitters do not need a specific pump wavelength, so cheaper and simpler laser sources can be used without changing emission dynamics.
  • Models of TSC generation can treat the pump as heating the electron system; resonant features in the band structure within one pump photon of the Fermi level do not need to be included to reproduce the observed dynamics.
  • Direct optical excitation of 4f states in rare-earth ferrimagnets, or of carriers across the band gap in ferrimagnetic insulators, does not produce a measurable signal at the sensitivity of the present experiment.
  • Energy-dependent tunneling through MgO defect states is not the rate-limiting step: the THz spin-current waveform is the same at 1.5 eV and 3 eV.
  • The population of primary hot electrons is estimated at about one percent or less, so pushing sensitivity beyond the current noise floor may reveal their signatures.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A direct test of the heating picture would compare one-photon 3 eV excitation with two-photon 1.5 eV excitation at equal absorbed energy: the heating model predicts similar TSC amplitudes, while a model with primary-electron sensitivity predicts differences.
  • The normalization freedom means the amplitude statement is weaker than the dynamics statement; a calibrated absolute-amplitude measurement would cleanly separate photon-energy-dependent generation efficiency from absorption.
  • The result suggests that optically induced spin transfer and superdiffusive hot-electron spin currents will be hard to isolate in these stacks; experiments aiming at them should use detection below the current ~1% noise floor or use stacks designed to suppress thermal currents.
  • Extending the pump range to lower or higher photon energies (for example, 0.95 eV or 4.7 eV) would test whether the thermal bottleneck holds across a wider bandwidth.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

2 major / 5 minor

Summary. The manuscript reports terahertz-emission spectroscopy measurements of laser-induced spin currents in a broad set of ferromagnet/heavy-metal (F/HM) heterostructures, including metallic ferromagnets (Fe, CoFeB), ferrimagnetic insulators (maghemite, YIG, GIG), a half-metal (magnetite), a rare-earth alloy (Tb30Fe70), and CoFeB|MgO|Pt tunnel-barrier samples. For each system, the authors compare the THz emission excited at 1.5 eV and 3 eV photon energies. They find that the time-domain waveforms are nearly identical at the two photon energies, and, after applying a normalization factor to the 3 eV traces, that the signal amplitudes differ only moderately. The paper interprets these observations as evidence that ultrafast laser-induced electron heating is the dominant driving force of THz spin-current generation, while highly excited primary photoelectrons play a minor role.

Significance. If the result holds, the paper establishes a useful experimental fact: the dynamics of THz spin currents in a wide range of F/HM stacks are robust against changes in pump photon energy, which strengthens the case for electron-heating-mediated generation and simplifies practical use of spintronic THz sources across wavelengths. The systematic material coverage is a clear strength, as it explicitly addresses previously proposed photon-energy-sensitive scenarios: band-gap excitation in oxides, resonant 4f excitation in rare-earth alloys, and energy-dependent tunneling through MgO barriers. The dynamics comparison is clean because the waveforms are compared without any time scaling or reshaping, so the null result for the temporal shape carries real evidential weight. The main weakness is that the amplitude comparison is partly circular because the normalization factor allowed for the 3 eV traces includes the very spin-current-generation efficiency that is under test; the paper needs to address this for the amplitude part of the central claim to be credible.

major comments (2)
  1. [Section 3 (Results)] The amplitude claim that the TSC amplitude is 'only slightly' different at 3 eV is weakened by the normalization procedure. The text states that all 3 eV traces are multiplied by a normalization factor that accounts for '(iii) potential changes in the efficiency of spin-current generation and injection.' Since this efficiency is exactly the quantity the amplitude comparison is meant to test, allowing it into the normalization permits the scaling to absorb any photon-energy-dependent amplitude difference. For the amplitude part of the central claim to be falsifiable, the paper must either determine the factor independently (e.g., from measured absorptance and a separate calibration of the setup transfer function) and report its value with uncertainty, or explicitly restrict the claim to the dynamics null result. As written, the report that the maghemite signal is a factor of two smaller at 3 eV and attributed to Pt absorptance (Section 4.1) cannot be verified because the scaling factor is free and no error bars or statistics are given.
  2. [Sections 4.4 and 5 (and Supplementary Materials)] The quantitative estimates used to support the central interpretation—that the fraction of primary high-energy electrons is less than 1%, and that the number of spins generated by electron heating is 2-3 orders of magnitude larger than the number of primary excited carriers—are referenced to the Supplementary Materials but are not presented or derived in the manuscript text. These numbers are load-bearing because they are used to explain why primary-photoelectron contributions are below the noise level and why OISTR signatures are undetectable. The derivation should be included in the submission (or clearly stated in the main text with the key assumptions), otherwise the main text cannot be fully evaluated by a reader. If the Supplementary Material already contains these details, please confirm that it is part of the submitted version.
minor comments (5)
  1. [Section numbering] The section numbering is inconsistent: after Section 4.1, the text introduces '3.3 Excitation of spin-polarized 4f-type electrons...' and '4.4 Energy-dependent tunneling...', which appear to be misnumbered and should be sequential (e.g., 4.2, 4.3, 4.4).
  2. [Figure 4 caption] The caption of Figure 4 repeats the panel label '(a)' twice ('(a) THz-emission signal ... (a) THz signals for various MgO thicknesses'); the second should presumably be '(b)' or a different label to match the figure panels.
  3. [Section 3 (Results), normalization wording] The phrase 'all THz signals are normalized by the absorbed pump fluence' is potentially misleading because the additional normalization factor applied to the 3 eV traces also includes effects (i)-(iii); please clarify which normalization is applied first and how the absorbed pump fluence is determined for each photon energy.
  4. [Abstract and Conclusions] The abstract and conclusions state that amplitudes are 'only slightly' different, but for maghemite the difference is about a factor of two. Please specify whether 'slightly' refers to the amplitude after the normalization factor or to the raw measured amplitudes, and quantify the range of amplitude differences observed across all samples.
  5. [References 15 and 47] References 15 and 47 are arXiv preprints; for a formal publication, please provide peer-reviewed versions if available, or clearly mark them as preprints.

Circularity Check

1 steps flagged · score 6.0 of 10

Amplitude-invariance claim is partly constructed: the 3 eV normalization factor is allowed to absorb the very spin-current generation/injection efficiency the comparison aims to test.

  1. fitted input called prediction [Section 3, Results (normalization procedure, Figs. 2-4)]
    "The signals corresponding to the 3 eV excitation (blue curves) are multiplied by a normalization factor (indicated adjacent to each curve in the first column of Figs. 2-4) to facilitate direct comparison with the 1.5 eV data."

    The paper's headline amplitude claim is that the induced TSC amplitude changes only slightly with photon energy. But the normalization factor is explicitly allowed to include '(iii) potential changes in the efficiency of spin-current generation and injection,' which is exactly the quantity the amplitude comparison is supposed to measure. If the factor can absorb photon-energy-dependent changes in generation/injection efficiency, then the similarity of the scaled 1.5 eV and 3 eV amplitudes is partly an input to the analysis rather than an independent outcome. The paper even attributes the maghemite factor-of-two difference to Pt absorptance, yet with a free scaling factor that already includes absorption-related terms, that attribution is not falsifiable from the presented data.

full rationale

The strongest and only load-bearing circular step is the normalization of the 3 eV THz traces. After the paper states that all signals are normalized by absorbed pump fluence, it multiplies the 3 eV traces by a factor that is explicitly allowed to include '(iii) potential changes in the efficiency of spin-current generation and injection.' This makes the amplitude part of the central claim ('only slightly the amplitude') at least partially circular: any efficiency difference can be absorbed into the normalization factor, so the resulting amplitude similarity is not a fully independent measurement. The paper gives no error bars or independent calibration for these factors, and the maghemite amplitude attribution to Pt absorptance cannot be falsified once absorption and efficiency effects are included in the same flexible multiplier. The dynamics comparison, by contrast, is independent and convincing because normalization does not alter waveform shape or timing; the identical TSC dynamics at 1.5 eV and 3 eV genuinely support the conclusion that ultrafast electron heating, rather than the energy of individual photons, controls the spin-current dynamics. The mechanistic estimates in Section 4 and the Conclusions are supporting rather than circular, and no load-bearing self-citation chain or uniqueness-import argument appears. The central claim therefore retains substantial independent content, but the amplitude-invariance result is partially circular by construction, warranting a score of 6 rather than 0 or 2.

Assumptions & free parameters 1 free parameters · 4 assumptions · 0 invented entities

The central claim rests on the standard SSE/PSE models, the assumption of linear DOS near the Fermi level, the assumption that THz emission is proportional to the spin current via ISHE, and the per-sample normalization factors used to compare the two photon energies. The quantitative estimates that support the heating-dominance interpretation are not in the main text.

free parameters (1)
  • normalization factor for 3 eV traces (per sample) = Varying values, e.g., Fe ~1.55, maghemite ~2, magnetite ~1.0, Tb30Fe70 ~1.1, CoFeB|MgO(0 nm) ~1, CoFeB|MgO(0.4 nm)…
    Each 3 eV trace is multiplied by a factor chosen to compare with the 1.5 eV trace. The factor is allowed to include efficiency changes, so the claim of amplitude invariance depends on these choices.
assumptions (4)
  • domain assumption Spin current generation is described by SSE and PSE mechanisms with driving forces Te_HM - Tmag_FI and mu_s_HM - mu_s_FM (Eqs. 1-2).
    The interpretation of unchanged THz signals as unchanged spin currents assumes these mechanisms and that THz emission is proportional to spin current via ISHE.
  • domain assumption Density of states near the Fermi level varies approximately linearly.
    This is a key assumption from Ref. 31 used in both SSE and PSE models; the paper notes it may break down for resonances within one pump photon energy.
  • domain assumption The THz detection transfer function is identical for both photon energies up to a constant scale factor.
    The comparison of waveforms after applying a per-sample normalization assumes no photon-energy-dependent distortion of the THz signal except a multiplicative constant.
  • domain assumption Supplementary estimates of absorbed fluence and spin counts are correct.
    Key quantitative claims (fraction of high-energy electrons <1%, spin counts 6.5 vs 0.16 spins/nm2) are only in Supplementary, not in main text.

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Cite this review

Pith. "Pith review of Ultrafast electron heating as the dominant driving force of photoinduced terahertz spin currents." pith.science (2026). https://pith.science/paper/KEI3OCFT

@misc{pith2026250700977,
  author       = {Pith},
  title        = {Pith review of: Ultrafast electron heating as the dominant driving force of photoinduced terahertz spin currents},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/KEI3OCFT}},
  note         = {Machine review of arXiv:2507.00977}
}
read the original abstract

Ultrafast spintronics strongly relies on the generation, transport, manipulation and detection of terahertz spin currents (TSCs). In F|HM stacks consisting of a ferromagnetic layer F and a heavy-metal layer HM, ultrafast spin currents are typically triggered by femtosecond optical laser pulses. A key open question is whether the initial step, optical excitation and injection of spin currents, can be controlled by tuning the photon energy of the femtosecond pulse. While many theoretical works suggest a marked impact of photon-energy and of highly excited non-thermal electrons, profound experimental evidence is lacking. Here, we use terahertz-emission spectroscopy to study TSCs triggered with two different photon energies of 1.5 eV and 3 eV. We study a wide range of magnetic systems covering metallic ferromagnets, ferrimagnetic insulators, half-metals, as well as systems including tunneling barriers, and rare-earth metallic alloys. We find that variation of the exciting photon energy does not change the dynamics and only slightly the amplitude of the induced TSC in all sample systems. Our results reveal that the ultrafast pump-induced heating of electrons is a highly efficient process for generating TSCs, whereas highly excited primary photoelectrons are of minor importance.

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Reference graph

Works this paper leans on

54 extracted references · 54 canonical work pages

  1. [1]

    26 Tbit s−1 line-rate super-channel transmission utilizing all-optical fast Fourier transform processing

    Hillerkuss, D.; Schmogrow, R.; Schellinger, T.; Jordan, M.; Winter, M.; Huber, G.; Vallaitis, T.; Bonk, R.; Kleinow, P .; Frey, F.; Roeger, M.; Koenig, S.; Ludwig, A.; Marculescu, A.; Li, J.; Hoh, M.; Dreschmann, M.; Meyer, J.; Ben Ezra, S.; Narkiss, N.; Nebendahl, B.; Parmigiani, F.; Petropoulos, P .; Resan, B.; Oehler, A.; Weingarten, K.; Ellermeyer, T....

    work page 2011

  2. [2]

    S.; Kampfrath, T.; Kono, J.; Castro-Camus, E.; Peng, K.; Qureshi, N.; Turchinovich, D.; Tanaka, K.; Markelz, A

    Leitenstorfer, A.; Moskalenko, A. S.; Kampfrath, T.; Kono, J.; Castro-Camus, E.; Peng, K.; Qureshi, N.; Turchinovich, D.; Tanaka, K.; Markelz, A. G.; Havenith, M.; Hough, C.; Joyce, H. J.; Padilla, W. J.; Zhou, B.; Kim, K.-Y .; Zhang, X.-C.; Jepsen, P . U.; Dhillon, S.; Vitiello, M.; Linfield, E.; Davies, A. G.; Hoffmann, M. C.; Lewis, R.; Tonouchi, M.; K...

    work page 2023

  3. [3]

    Y .; Kawakami, R

    Vedmedenko, E. Y .; Kawakami, R. K.; Sheka, D. D.; Gambardella, P .; Kirilyuk, A.; Hirohata, A.; Binek, C.; Chubykalo-Fesenko, O.; Sanvito, S.; Kirby, B. J.; Grollier, J.; Everschor-Sitte, K.; Kampfrath, T.; You, C. Y .; Berger, A. The 2020 magnetism roadmap. Journal of Physics D: Applied Physics 2020, 53, (45), 453001

    work page 2020

  4. [4]

    Ultrafast and terahertz spintronics: Guest editorial

    Kampfrath, T.; Kirilyuk, A.; Mangin, S.; Sharma, S.; Weinelt, M. Ultrafast and terahertz spintronics: Guest editorial. Applied Physics Letters 2023, 123, (5)

    work page 2023

  5. [5]

    Perspective: Ultrafast magnetism and THz spintronics

    Walowski, J.; Münzenberg, M. Perspective: Ultrafast magnetism and THz spintronics. Journal of Applied Physics 2016, 120, (14)

    work page 2016

  6. [6]

    M.; Ji, R.; Lin, C.-H.; Thomson, T.; Graham, D

    Bull, C.; Hewett, S. M.; Ji, R.; Lin, C.-H.; Thomson, T.; Graham, D. M.; Nutter, P . W. Spintronic terahertz emitters: Status and prospects from a materials perspective. APL Materials 2021, 9, (9), 090701

    work page 2021

  7. [7]

    D.; Hansteen, F.; Kimel, A

    Stanciu, C. D.; Hansteen, F.; Kimel, A. V.; Kirilyuk, A.; Tsukamoto, A.; Itoh, A.; Rasing, T. All-Optical Magnetic Recording with Circularly Polarized Light. Physical Review Letters 2007, 99, (4), 047601

    work page 2007

  8. [8]

    Accelerating ultrafast magnetization reversal by non -local spin transfer

    Remy, Q.; Hohlfeld, J.; Vergès, M.; Le Guen, Y .; Gorchon, J.; Malinowski, G.; Mangin, S.; Hehn, M. Accelerating ultrafast magnetization reversal by non -local spin transfer . Nature Communications 2023, 14, (1), 445

    work page 2023

Show all 54 references
  1. [9]

    A.; Förster, J.; Reeve, R

    Litzius, K.; Lemesh, I.; Krüger, B.; Bassirian, P .; Caretta, L.; Richter, K.; Büttner, F.; Sato, K.; Tretiakov, O. A.; Förster, J.; Reeve, R. M.; Weigand, M.; Bykova, I.; Stoll, H.; Schütz, G.; Beach, G. S. D.; Kläui, M. Skyrmion Hall effect revealed by direct time-resolved X...

    2017

  2. [10]

    Parkin, S. S. P .; Hayashi, M.; Thomas, L. Magnetic Domain-Wall Racetrack Memory. Science 2008, 320, (5873), 190-194

    2008

  3. [11]

    S.; Cheng, L.; Wei, Z.; Kampfrath, T.; Qi, J

    Seifert, T. S.; Cheng, L.; Wei, Z.; Kampfrath, T.; Qi, J. Spintronic sources of ultrashort terahertz electromagnetic pulses. Applied Physics Letters 2022, 120, (18)

    2022

  4. [12]

    L.; Behovits, Y .; Serrano, B

    Rouzegar, R.; Chekhov, A. L.; Behovits, Y .; Serrano, B. R.; Syskaki, M. A.; Lambert, C. H.; Engel, D.; Martens, U.; Münzenberg, M.; Wolf, M.; Jakob, G.; Kläui, M.; Seifert, T. S.; Kampfrath, T. Broadband Spintronic Terahertz Source with Peak Electric Fields Exceeding 1.5 MV/c...

    2023

  5. [13]

    A.; Chekhov, A

    Rouzegar, R.; Wahada, M. A.; Chekhov, A. L.; Hoppe, W.; Bierhance, G.; Jechumtál, J.; Nádvorník, L.; Wolf, M.; Seifert, T. S.; Parkin, S. S. P .; Woltersdorf, G.; Brouwer, P . W.; Kampfrath, T. Terahertz Spin - Conductance Spectroscopy: Probing Coherent and Incoherent Ultrafas...

    2024

  6. [14]

    S.; Kubaščík, P .; Woltersdorf, G.; Brouwer, P

    Jechumtál, J.; Rouzegar, R.; Gueckstock, O.; Denker, C.; Hoppe, W.; Remy, Q.; Seifert, T. S.; Kubaščík, P .; Woltersdorf, G.; Brouwer, P . W.; Münzenberg, M.; Kampfrath, T.; Nádvorník, L. Accessing Ultrafast Spin- Transport Dynamics in Copper Using Broadband Terahertz Spectros...

    2024

  7. [15]

    F., Yuanzhe Tian, Zdeněk Kašpar, Reza Rouzegar, Oliver Gueckstock, Ji Wu, Maguang Zhu, Biaobing Jin, Yongbing Xu, Tom S

    Hongsong Qiu, O. F., Yuanzhe Tian, Zdeněk Kašpar, Reza Rouzegar, Oliver Gueckstock, Ji Wu, Maguang Zhu, Biaobing Jin, Yongbing Xu, Tom S. Seifert, Di Wu, Piet W. Brouwer, Tobias Kampfrath. Hallmarks of terahertz magnon currents in an antiferromagnetic insulator. ArXiv preprint...

    2025 arXiv

  8. [16]

    Ultrafast spin transport and control of spin current pulse shape in metallic multilayers

    Melnikov, A.; Brandt, L.; Liebing, N.; Ribow, M.; Mertig, I.; Woltersdorf, G. Ultrafast spin transport and control of spin current pulse shape in metallic multilayers. Physical Review B 2022, 106, (10), 104417

    2022

  9. [17]

    V.; Spada, F

    Li, G.; Medapalli, R.; Mikhaylovskiy, R. V.; Spada, F. E.; Rasing, T.; Fullerton, E. E.; Kimel, A. V. THz emission from Co/Pt bilayers with varied roughness, crystal structure, and interface intermixing . Physical Review Materials 2019, 3, (8), 084415

    2019

  10. [18]

    J.; Mikhaylovskiy, R

    Huisman, T. J.; Mikhaylovskiy, R. V.; Costa, J. D.; Freimuth, F.; Paz, E.; Ventura, J.; Freitas, P . P .; Blügel, S.; Mokrousov, Y .; Rasing, T.; Kimel, A. V. Femtosecond control of electric currents in metallic ferromagnetic heterostructures. Nature Nanotechnology 2016, 11, (...

    2016

  11. [19]

    J.; Ciccarelli, C.; Tsukamoto, A.; Mikhaylovskiy, R

    Huisman, T. J.; Ciccarelli, C.; Tsukamoto, A.; Mikhaylovskiy, R. V.; Rasing, T.; Kimel, A. V. Spin-photo- currents generated by femtosecond laser pulses in a ferrimagnetic GdFeCo/Pt bilayer. Applied Physics Letters 2017, 110, (7), 072402

    2017

  12. [20]

    V.; Kimel, A

    Sasaki, Y .; Li, G.; Moriyama, T.; Ono, T.; Mikhaylovskiy, R. V.; Kimel, A. V.; Mizukami, S. Laser stimulated THz emission from Pt/CoO/FeCoB. Applied Physics Letters 2020, 117, (19)

    2020

  13. [21]

    M.; Jourdan, M.; Jakob, G.; Turchinovich, D.; Hayden, L

    Seifert, T.; Jaiswal, S.; Martens, U.; Hannegan, J.; Braun, L.; Maldonado, P .; Freimuth, F.; Kronenberg, A.; Henrizi, J.; Radu, I.; Beaurepaire, E.; Mokrousov, Y .; Oppeneer, P . M.; Jourdan, M.; Jakob, G.; Turchinovich, D.; Hayden, L. M.; Wolf, M.; Münzenberg, M.; Kläui, M.;...

    2016

  14. [22]

    S.; Martens, U.; Radu, F.; Ribow, M.; Berritta, M.; Nádvorník, L.; Starke, R.; Jungwirth, T.; Wolf, M.; Radu, I.; Münzenberg, M.; Oppeneer, P

    Seifert, T. S.; Martens, U.; Radu, F.; Ribow, M.; Berritta, M.; Nádvorník, L.; Starke, R.; Jungwirth, T.; Wolf, M.; Radu, I.; Münzenberg, M.; Oppeneer, P . M.; Woltersdorf, G.; Kampfrath, T. Frequency-Independent Terahertz Anomalous Hall Effect in DyCo5, Co32Fe68, and Gd27Fe73...

    2021

  15. [23]

    S.; Bierhance, G.; Rouzegar, R.; Wolf, M.; Vafaee, M.; Cramer, J.; Syskaki, M

    Gueckstock, O.; Nádvorník, L.; Gradhand, M.; Seifert, T. S.; Bierhance, G.; Rouzegar, R.; Wolf, M.; Vafaee, M.; Cramer, J.; Syskaki, M. A.; Woltersdorf, G.; Mertig, I.; Jakob, G.; Kläui, M.; Kampfrath, T. Terahertz Spin-to-Charge Conversion by Interfacial Skew Scattering in Me...

    2021

  16. [24]

    P .; Wang, Z.; Ma, S

    Zhou, C.; Liu, Y . P .; Wang, Z.; Ma, S. J.; Jia, M. W.; Wu, R. Q.; Zhou, L.; Zhang, W.; Liu, M. K.; Wu, Y . Z.; Qi, J. Broadband Terahertz Generation via the Interface Inverse Rashba -Edelstein Effect. Physical Review Letters 2018, 121, (8), 086801

    2018

  17. [25]

    H.; Hawecker, J.; Rongione, E.; Baez Flores, G.; To, D

    Dang, T. H.; Hawecker, J.; Rongione, E.; Baez Flores, G.; To, D. Q.; Rojas -Sanchez, J. C.; Nong, H.; Mangeney, J.; Tignon, J.; Godel, F.; Collin, S.; Seneor, P .; Bibes, M.; Fert, A.; Anane, M.; George, J.-M.; Vila, L.; Cosset-Cheneau, M.; Dolfi, D.; Lebrun, R.; Bortolotti, P...

    2020

  18. [26]

    B.; Zhang, Q.; Zhang, W.; Pearson, J

    Jungfleisch, M. B.; Zhang, Q.; Zhang, W.; Pearson, J. E.; Schaller, R. D.; Wen, H.; Hoffmann, A. Control of Terahertz Emission by Ultrafast Spin -Charge Current Conversion at Rashba Interfaces . Physical Review Letters 2018, 120, (20), 207207

    2018

  19. [27]

    High-Performance THz Emitters Based on Ferromagnetic/Nonmagnetic Heterostructures

    Wu, Y .; Elyasi, M.; Qiu, X.; Chen, M.; Liu, Y .; Ke, L.; Yang, H. High-Performance THz Emitters Based on Ferromagnetic/Nonmagnetic Heterostructures. Advanced Materials 2017, 29, (4), 1603031

    2017

  20. [28]

    Laser pulse induced efficient terahertz emission from Co/Al heterostructures

    Zhang, H.; Feng, Z.; Zhang, J.; Bai, H.; Yang, H.; Cai, J.; Zhao, W.; Tan, W.; Hu, F.; Shen, B.; Sun, J. Laser pulse induced efficient terahertz emission from Co/Al heterostructures . Physical Review B 2020, 102, (2), 024435

    2020

  21. [29]

    S.; Jaiswal, S.; Barker, J.; Weber, S

    Seifert, T. S.; Jaiswal, S.; Barker, J.; Weber, S. T.; Razdolski, I.; Cramer, J.; Gueckstock, O.; Maehrlein, S. F.; Nadvornik, L.; Watanabe, S.; Ciccarelli, C.; Melnikov, A.; Jakob, G.; Münzenberg, M.; Goennenwein, S. T. B.; Woltersdorf, G.; Rethfeld, B.; Brouwer, P . W.; Wolf...

    2018

  22. [30]

    S.; Wolf, M.; Rouzegar, R.; Brouwer, P

    Jiménez-Cavero, P .; Gueckstock, O.; Nádvorník, L.; Lucas, I.; Seifert, T. S.; Wolf, M.; Rouzegar, R.; Brouwer, P . W.; Becker, S.; Jakob, G.; Kläui, M.; Guo, C.; Wan, C.; Han, X.; Jin, Z.; Zhao, H.; Wu, D.; Morellón, L.; Kampfrath, T. Transition of laser -induced terahertz sp...

    2022

  23. [31]

    A.; Chekhov, A

    Rouzegar, R.; Brandt, L.; Nádvorník, L.; Reiss, D. A.; Chekhov, A. L.; G ueckstock, O.; In, C.; Wolf, M.; Seifert, T. S.; Brouwer, P . W.; Woltersdorf, G.; Kampfrath, T. Laser-induced terahertz spin transport in magnetic nanostructures arises from the same force as ultrafast d...

    2022

  24. [32]

    L.; Wolf, M.; Seifert, T

    Bierhance, G.; Markou, A.; Gueckstock, O.; Rouzegar, R.; Behovits, Y .; Chekhov, A. L.; Wolf, M.; Seifert, T. S.; Felser, C.; Kampfrath, T. Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co2MnGa and Co2MnAl. Applied Physics Letters 2022...

    2022

  25. [33]

    K.; Baer, Y .; Cox, P

    Lang, J. K.; Baer, Y .; Cox, P . A. Study of the 4f and valence band density of states in rare-earth metals. II. Experiment and results. Journal of Physics F: Metal Physics 1981, 11, (1), 121

    1981

  26. [34]

    Magnetic-Field-Dependent THz Emission of Spintronic TbFe/Pt Layers

    Schneider, R.; Fix, M.; Heming, R.; Michaelis de Vasconcellos, S.; Albrecht, M.; Bratschitsch, R. Magnetic-Field-Dependent THz Emission of Spintronic TbFe/Pt Layers. ACS Photonics 2018, 5, (10), 3936-3942

    2018

  27. [35]

    J.; Mikhaylovskiy, R

    Huisman, T. J.; Mikhaylovskiy, R. V.; Tsukamoto, A.; Rasing, T.; Kimel, A. V. Simultaneous measurements of terahertz emission and magneto -optical Kerr effect for resolving ultrafast laser -induced demagnetization dynamics. Physical Review B 2015, 92, (10), 104419

    2015

  28. [36]

    A.; Şaşıoğlu, E.; Hoppe, W.; Zhou, X.; Deniz, H.; Rouzegar, R.; Kampfrath, T.; Mertig, I.; Parkin, S

    Wahada, M. A.; Şaşıoğlu, E.; Hoppe, W.; Zhou, X.; Deniz, H.; Rouzegar, R.; Kampfrath, T.; Mertig, I.; Parkin, S. S. P .; Woltersdorf, G. Atomic Scale Control of Spin Current Transmission at Interfaces. Nano Letters 2022, 22, (9), 3539-3544

    2022

  29. [37]

    Battiato, M.; Carva, K.; Oppeneer, P . M. Superdiffusive Spin Transport as a Mechanism of Ultrafast Demagnetization. Physical Review Letters 2010, 105, (2), 027203

    2010

  30. [38]

    M.; Stamm, C

    Eschenlohr, A.; Battiato, M.; Maldonado, P .; Pontius, N.; Kachel, T.; Holldack, K.; Mitzner, R.; Föhlisch, A.; Oppeneer, P . M.; Stamm, C. Ultrafast spin transport as key to femtosecond demagnetization . Nature Materials 2013, 12, (4), 332-336

    2013

  31. [39]

    A.; Duine, R

    Beens, M.; de Mare, K. A.; Duine, R. A.; Koopmans, B. Spin-polarized hot electron transport versu s spin pumping mediated by local heating. Journal of Physics: Condensed Matter 2023, 35, (3), 035803

    2023

  32. [40]

    P .; Krauß, M.; Andreyev, O.; Schneider, H

    Cinchetti, M.; Sánchez Albaneda, M.; Hoffmann, D.; Roth, T.; Wüstenberg, J. P .; Krauß, M.; Andreyev, O.; Schneider, H. C.; Bauer, M.; Aeschlimann, M. Spin-Flip Processes and Ultrafast Magnetization Dynamics in Co: Unifying the Microscopic and Macroscopic View of Femtosecond M...

    2006

  33. [41]

    A.; Kim, J

    Shim, J.-H.; Syed, A. A.; Kim, J. -I.; Piao, H.-G.; Lee, S.-H.; Park, S.-Y .; Choi, Y . S.; Lee, K. M.; Kim, H.-J.; Jeong, J.-R.; Hong, J. -I.; Kim, D. E.; Kim, D. -H. Role of non -thermal electrons in ultrafast spin dynamics of ferromagnetic multilayer. Scientific Reports 202...

    2020

  34. [42]

    C.; Knox, W

    Leitenstorfer, A.; Hunsche, S.; Shah, J.; Nuss, M. C.; Knox, W. H. Detectors and sources for ultrabroadband electro-optic sampling: Experiment and theory. Applied Physics Letters 1999, 74, (11), 1516- 1518

    1999

  35. [43]

    Two-photon photoemission spectroscopy of $\mathrm{Ti}{\mathrm{O}}_{2}(110)$ surfaces modified by defects and ${ \mathrm{O}}_{2}$ or ${\mathrm{H}}_{2}\mathrm{O}$ adsorbates

    Onda, K.; Li, B.; Petek, H. Two-photon photoemission spectroscopy of $\mathrm{Ti}{\mathrm{O}}_{2}(110)$ surfaces modified by defects and ${ \mathrm{O}}_{2}$ or ${\mathrm{H}}_{2}\mathrm{O}$ adsorbates. Physical Review B 2004, 70, (4), 045415

    2004

  36. [44]

    I.; Hornett, S

    Herapath, R. I.; Hornett, S. M.; Seifert, T. S.; Jakob, G.; Kläui, M.; Bertolotti, J.; Kampfrath, T.; Hendry, E. Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer. Applied Physics Letters 2019, 114, (4), 041107

    2019

  37. [45]

    L.; Behovits, Y .; Heitz, J

    Chekhov, A. L.; Behovits, Y .; Heitz, J. J. F.; Denker, C.; Reiss, D. A.; Wolf, M.; Weinelt, M.; Brouwer, P . W.; Münzenberg, M.; Kampfrath, T. Ultrafast Demagnetization of Iron Induced by Optical versus Terahertz Pulses. Physical Review X 2021, 11, (4), 041055

    2021

  38. [46]

    T.; Torosyan, G.; Keller, S.; Scheuer, L.; Battiato, M.; Mag-Usara, V

    Papaioannou, E. T.; Torosyan, G.; Keller, S.; Scheuer, L.; Battiato, M.; Mag-Usara, V. K.; L’huillier, J.; Tani, M.; Beigang, R. Efficient Terahertz Generation Using Fe/Pt Spintronic Emitters Pumped at Different Wavelengths. IEEE Transactions on Magnetics 2018, 54, (11), 1-5

    2018

  39. [47]

    A., Beatrice Andres, Pilar Jiménez-Cavero, Cornelius Gahl, Tom S

    Oliver Gueckstock, T. A., Beatrice Andres, Pilar Jiménez-Cavero, Cornelius Gahl, Tom S. Seifert, Reza Rouzegar, Ilie Radu, Irene Lucas, Marko Wietstruk, Luis Morellón, Martin Weinelt, Tobias Kampfrath, Nele Thielemann-Kühn. Magnon-mediated terahertz spin t ransport in metallic...

    2025 arXiv

  40. [48]

    Maghemite thin films prepared using atmospheric-pressure plasma annealing

    Chen, H.-Y .; Yang, S.-H. Maghemite thin films prepared using atmospheric-pressure plasma annealing. Journal of Vacuum Science & Technology A 2018, 36, (4)

    2018

  41. [49]

    -S.; Lin, C

    Lee, J.-S.; Song, Y.-J.; Hsu, H. -S.; Lin, C. -R.; Huang, J. -Y .; Chen, J. Magnetic enhancement of carbon - encapsulated magnetite nanoparticles. Journal of Alloys and Compounds 2019, 790, 716-722

    2019

  42. [50]

    Fan, Y .; Lin, Y .; Wang, K.; Zhang, K. H. L.; Yang, Y . Intrinsic polaronic photocarrier dynamics in hematite. Physical Review B 2021, 103, (8), 085206

    2021

  43. [51]

    R.; McClelland, E

    Muxworthy, A. R.; McClelland, E. Review of the low -temperature magnetic properties of magnetite from a rock magnetic perspective. Geophysical Journal International 2000, 140, (1), 101-114

    2000

  44. [52]

    A.; Ostler, T

    Radu, I.; Vahaplar, K.; Stamm, C.; Kachel, T.; Pontius, N.; Dürr, H. A.; Ostler, T. A.; Barker, J.; Evans, R. F. L.; Chantrell, R. W.; Tsukamoto, A.; Itoh, A.; Kirilyuk, A.; Rasing, T.; Kimel, A. V. Transient ferromagnetic-like state mediating ultrafast reversal of antiferroma...

    2011

  45. [53]

    O.; Chirac, T.; Rousseau, O.; Solignac, A.; Vaudel, G.; Ruello, P .; Chauleau, J.-Y .; Viret, M

    Levchuk, A.; Juvé, V.; Otomalo, T. O.; Chirac, T.; Rousseau, O.; Solignac, A.; Vaudel, G.; Ruello, P .; Chauleau, J.-Y .; Viret, M. Pump wavelength-dependent terahertz spin -to-charge conversion in CoFeB/MgO Rashba interface. Applied Physics Letters 2023, 123, (1)

    2023

  46. [54]

    S.; Güdde, J.; Conrad, U.; Jähnke, V.; Matthias, E

    Hohlfeld, J.; Wellershoff, S. S.; Güdde, J.; Conrad, U.; Jähnke, V.; Matthias, E. Electron and lattice dynamics following optical excitation of metals. Chemical Physics 2000, 251, (1), 237-258

    2000

Pith tools

Reviewed August 6, 2026 · model on record in the stance chip above.