pith. sign in

arxiv: 2605.03982 · v1 · submitted 2026-05-05 · ❄️ cond-mat.mtrl-sci

Magneto Transport and Spin Reorientation in Pt Co78Ho22 Heterostructures Near the Sublattice Compensation Temperature

Rajeev Nepal , Jose Flores , Aurain Seaton , Michael Newburger , John Derek Demaree , Ramesh C Budhani This is my paper

Pith reviewed 2026-05-07 15:29 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords amorphous ferrimagnetscompensation temperatureanomalous Hall effectspin Hall magnetoresistancespin reorientationCoHo alloysheterostructuressublattice moments
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The pith

The anomalous Hall resistivity reverses sign and forms wing-shaped loops near the sublattice compensation temperature in Co78Ho22 films and Pt heterostructures.

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

The authors study magneto-transport in amorphous Co78Ho22 alloy films and Pt/Co78Ho22/Al heterostructures. They observe that the Hall resistivity reverses sign and develops wing-shaped hysteresis loops near the compensation temperature where cobalt and holmium moments cancel, at which point net magnetization is minimum. The spin Hall magnetoresistance increases with the added platinum layer. These features are interpreted through spin flop transitions, spin-orbit torque at interfaces, and possible formation of separate magnetic clusters. A reader might care because the temperature and composition can be adjusted to control the sign and shape of the magnetic response in these rare-earth alloys.

Core claim

The Hall resistivity of both the Co78Ho22.Al film and the Pt.Co78Ho22.Al heterostructure shows a distinct sign reversal and prominent wing-shaped hysteresis loops near the compensation temperature Tcomp, accompanied by minimum saturation magnetization, while the SHMR is enhanced by the Pt layer; these magneto-transport features are addressed using existing theories of spin flop transitions, spin orbit torque, and microscopic phase separation.

What carries the argument

Sublattice compensation temperature Tcomp at which opposing Co and Ho moments yield zero net magnetization, producing Hall sign reversal and altered hysteresis shape through spin reorientation.

If this is right

  • The Hall sign change and wing loops appear only near Tcomp and track the magnetization minimum.
  • The platinum layer strengthens spin Hall magnetoresistance through interfacial spin-orbit effects.
  • Spin flop transitions and phase separation into 3d-4f clusters consistently explain the observed loops.
  • Changing the cobalt-to-holmium ratio shifts Tcomp and thereby moves the temperature window of the transport anomalies.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Similar Hall sign flips and reorientation signatures may occur in other transition-metal rare-earth alloys that have large unquenched orbital moments.
  • Temperature-tuned transport changes could support devices whose magnetic response switches at a chosen operating point.
  • Real-space imaging of domains or clusters near Tcomp would test whether phase separation is required for the wing loops.

Load-bearing premise

The sign reversal, wing-shaped loops, and SHMR enhancement arise from standard spin flop transitions, spin-orbit torque, and microscopic phase separation without needing mechanisms specific to the Ho-based alloy.

What would settle it

Hall resistivity measurements showing no sign reversal or wing loops at temperatures well away from Tcomp, or no SHMR increase in the Pt-containing sample, would break the claimed link to compensation and the Pt interface.

Figures

Figures reproduced from arXiv: 2605.03982 by Aurain Seaton, John Derek Demaree, Jose Flores, Michael Newburger, Rajeev Nepal, Ramesh C Budhani.

Figure 1
Figure 1. Figure 1: Topographical and magnetic textures of a 25 nm HoCo film deposited on a 9 nm Pt view at source ↗
Figure 2
Figure 2. Figure 2: Magnetization and Hall resistivity measurements on HoCo film and HoCo/Pt bilayer, with the magnetic field applied perpendicular to the film plane (out-of-plane). (a) Hall resistivity ρxy as a function of temperature of the bare 25 nm thick HoCo film measured at 2 tesla, showing a polarity reversal at the magnetic compensation temperature (Tcomp) ~ 192 K. All ρxy data have been antisymmetrized to isolate th… view at source ↗
Figure 3
Figure 3. Figure 3: (a) Hall resistivity (ρₓᵧ) of HoCo film over a temperature range of 150 to 250 K. A dramatic change in the shape of the xy loops, along with a sign reversal are seen in the figure. A distinct triple-loop (pointed by the red arrow) in the xy (H) is observed near the compensation temperature of Tcomp  190 K. (b) Corresponding out-of-plane magnetization (M–H) loops of the same sample at T = 150, 180, 190, … view at source ↗
Figure 4
Figure 4. Figure 4: (a) Anomalous Hall hysteresis loops (ρₓy(H)) of Pt/Ho–Co films measured across temperatures from 116 to 148 K. A distinct triple-loop structure is observed around the compensation temperature of ≈ 135 K. (b) Corresponding out-of-plane magnetization (M(H)) view at source ↗
Figure 5
Figure 5. Figure 5: (a) Hall resistivity shown for the positive field branches (0 to +5 T) at T = 140 K, highlighting the region between H1, H2 , and H3 switching fields of the two-loop Hall signal and corresponding schematics of spin configurations. Red and blue arrows represent the relative orientation and magnitude of Co and Ho moments, respectively. (b) Representative Phase diagram of Pt/HoCo thin films constructed from t… view at source ↗
Figure 7
Figure 7. Figure 7: Angular magnetoresistance of a Ho22Co78 (25 nm) film measured at 2 tesla. The (a) and (b) panels display the evolution of the OMR and SMR components as a function of angle  and  respectively over the temperature range 10 to 300 K. The rotation geometry for α and β is displayed in view at source ↗
Figure 8
Figure 8. Figure 8: Angular magnetoresistance of the HoCo/Pt film. The (a) and (b) panels display the view at source ↗
read the original abstract

Metallic amorphous ferrimagnets of 3d transition metals (TM) and rare earths (RE) with 4f electrons exhibit rich magneto transport behavior due to the interplay between the 3d and 4f magnetic sublattices and their interaction with mobile charges. Tuning the TM and RE concentrations in the alloy can effectively modulate the compensation temperature, where the moments of the two sublattices point in opposite direction leading to a net zero magnetization. Despite extensive magnetotransport studies in Gd and Tb based 3d 4f systems, Ho based alloys remain comparatively underexplored, even though Ho possesses the largest orbital angular momentum (OAM) among the lanthanides. This unquenched OAM can strongly impact magnetic anisotropy and magnetotransport in ferrimagnetic heterostructures. Here, we have investigated the anomalous Hall resistivity , dc magnetization, and spin Hall magnetoresistance (SHMR) of Co78Ho22.Al film and a Pt.Co78Ho22.Al heterostructure deposited using multitarget magnetron sputtering. The Hall resistivity of both systems shows a distinct sign reversal and prominent wing-shaped hysteresis loops in the vicinity of the compensation temperature (Tcomp), which is accompanied by the minimum saturation magnetization near Tcomp. Furthermore, the SHMR in Pt.Co78Ho22.Al film is enhanced due to the Pt layer. These HM interface-induced prominent features of magneto-transport are addressed in the light of the existing theories of spin flop transitions, spin orbit torque, and microscopic phase separation, which may lead to the formation of 3d and 4f magnetic clusters in the film.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. The manuscript reports magnetotransport and magnetization measurements on amorphous Co78Ho22/Al films and Pt/Co78Ho22/Al heterostructures prepared by multitarget magnetron sputtering. It observes a sign reversal in the anomalous Hall resistivity accompanied by wing-shaped hysteresis loops near the compensation temperature Tcomp (where saturation magnetization is minimized), and an enhancement of spin Hall magnetoresistance due to the Pt layer. These features are qualitatively interpreted using existing models of spin-flop transitions, spin-orbit torque, and microscopic 3d/4f phase separation without invoking new Ho-specific mechanisms.

Significance. If the interpretations hold with quantitative support, the work is significant for extending magneto-transport studies of 3d-4f amorphous ferrimagnets to Ho-based alloys, which remain underexplored despite Ho having the largest unquenched orbital angular momentum among lanthanides. This could influence anisotropy and scattering in heterostructures, and the Pt-interface SHMR enhancement may inform spintronic device design near compensation points.

major comments (1)
  1. [Discussion] Discussion section: The central claim that the Hall sign reversal, wing-shaped loops, and SHMR enhancement are accounted for by standard spin-flop/SOT/phase-separation models without Ho-specific mechanisms is presented only qualitatively. No model fits to the data, calculated AHE curves, or direct comparisons of measured vs. predicted loop widths/coercivities or temperature dependences are shown, leaving the assumption untested especially given Ho's large OAM which can alter anisotropy beyond Gd/Tb analogs. This is load-bearing for the interpretive conclusions.
minor comments (2)
  1. [Results] Results/Methods: The abstract and summary lack details on error bars for Hall resistivity and magnetization data, temperature control precision, and film quality characterization (e.g., confirmation of amorphous structure), which would strengthen the experimental support for the observed features near Tcomp.
  2. [Abstract] Abstract: The statement that features 'are addressed in the light of the existing theories' should be expanded in the main text with at least schematic comparisons to model predictions to avoid appearing as post-hoc attribution.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading and constructive feedback on our manuscript. We address the major comment point by point below and will revise the Discussion section accordingly to strengthen the interpretive claims.

read point-by-point responses

  1. Referee: [Discussion] Discussion section: The central claim that the Hall sign reversal, wing-shaped loops, and SHMR enhancement are accounted for by standard spin-flop/SOT/phase-separation models without Ho-specific mechanisms is presented only qualitatively. No model fits to the data, calculated AHE curves, or direct comparisons of measured vs. predicted loop widths/coercivities or temperature dependences are shown, leaving the assumption untested especially given Ho's large OAM which can alter anisotropy beyond Gd/Tb analogs. This is load-bearing for the interpretive conclusions.

    Authors: We agree that the current Discussion relies on qualitative consistency with established models rather than quantitative fits. The observed AHE sign reversal and wing-shaped loops near Tcomp align with the standard picture of spin-flop transitions in ferrimagnets (where net magnetization approaches zero and sublattice reorientation occurs), while the SHMR enhancement follows directly from Pt-induced spin current absorption at the interface. These features match reports on Gd- and Tb-based analogs without requiring new Ho-specific physics, even though we explicitly note Ho's large OAM in the Introduction. To address the referee's valid concern, the revised manuscript will expand the Discussion with a semi-quantitative comparison: we will include a mean-field two-sublattice calculation of M(T) fitted to our magnetization data to predict the temperature range of the sign reversal, and we will estimate loop widths using literature spin-flop parameters for similar alloys. Direct overlays of these estimates against the measured AHE and hysteresis data will be added, along with references to prior quantitative modeling in 3d-4f systems. This will test the applicability of the standard models and clarify that Ho's OAM influences anisotropy magnitude but does not alter the underlying mechanisms invoked. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental observations with qualitative discussion of standard models

full rationale

The manuscript reports measurements of anomalous Hall resistivity, dc magnetization, and spin Hall magnetoresistance in Co78Ho22/Al and Pt/Co78Ho22/Al films. The sign reversal, wing-shaped loops near Tcomp, and SHMR enhancement are noted as experimental facts and then interpreted by reference to pre-existing literature on spin-flop transitions, spin-orbit torque, and microscopic phase separation. No equations, fitted parameters, predictions, or derivations appear in the provided text; the central claims are direct observations rather than model outputs that reduce to the inputs by construction. Self-citations, if present, are not load-bearing for any claimed derivation.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The paper is experimental and invokes standard condensed-matter models to interpret results rather than introducing new theoretical constructs.

axioms (1)
  • domain assumption Standard models of ferrimagnetism, spin-orbit coupling, and spin Hall effects apply to amorphous Co-Ho alloys and Pt interfaces.
    Used to link observed sign reversal and SHMR enhancement to spin flop transitions and phase separation.

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