Roughness-robust surface altermagnetism is allowed only in PT-symmetric antiferromagnets and can be generated or suppressed by roughness averaging over compensated or uncompensated terminations.
Altermagnetic spintronics
14 Pith papers cite this work, alongside 1 external citations. Polarity classification is still indexing.
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abstract
The research landscape of magnetism has been recently enriched by the discovery of altermagnetism. It is an unconventional phase of matter characterized by a d-wave (or higher even-parity-wave) collinear compensated spin ordering, which enables strongly spin-polarized currents in the absence of magnetization, and features fast spin dynamics. Simultaneously, on the applied magnetism front, spintronic memories based on conventional ferromagnets are currently turning from a niche to a mass produced integrated-circuit technology as they start to complement semiconductors on advanced-node microprocessor chips. Our review connects these two rapidly developing science and technology fields by discussing how the unique signatures of altermagnetism can impact the functionality and scalability of future spintronic devices. As a reference, we first briefly recall the merits and physical limitations of the present ferromagnetic spintronic technology, and of proof-of-concept spintronic devices based on conventional collinear antiferromagnets and non-collinear compensated magnets. The main part of the review then focuses on physical concepts of the altermagnetic spintronics, and its potential interplay with ferroelectricity or superconductivity. We conclude with an outlook on the nascent experimental research of altermagnetic spintronics, and on the role of relativistic phenomena.
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Monolayer V2O in a buckled Lieb structure is proposed as a room-temperature 2D altermagnet with 1.2 eV momentum-dependent spin splitting, out-of-plane anisotropy, and ~40 (ħ/e) S cm^{-1} spin Hall conductivity.
Localized Ce 4f electrons suppress p-wave altermagnetic band splitting in CeNiAsO's Ni 3d conduction bands to the few-meV scale.
DFT+DMFT reveals RuO2 sits near the paramagnetic-altermagnetic boundary and itinerant-localized crossover, making its magnetic state tunable by minimal strain due to dynamical correlations.
Strain continuously rotates the Néel vector in altermagnetic MnTe, tuning its magnetic point group symmetry.
Surface altermagnetism with d-wave spin splitting occurs in centrosymmetric collinear antiferromagnets only when no sublattice-exchanging antiunitary symmetry survives at the surface, as shown by symmetry analysis and first-principles calculations on V3Al and BaMn2Sb2 versus MnPt.
Extended s-wave altermagnets are introduced as fully gapped spin-compensated states with isotropic spin splitting arising from valley-exchange symmetries, shown via effective two-valley and microscopic models with guiding principles for identification.
Checkerboard-lattice Hubbard electrons are unstable to weak-coupling altermagnetism whose magnons display alternating chirality splitting.
Floquet driving in 2D d-wave altermagnets with Rashba SOC induces out-of-plane magnetization and equilibrium-forbidden AMR and AHE.
Rolling 2D d-wave altermagnets into nanotubes converts momentum-dependent spin splitting into chiral-angle-controlled 1D splitting via dimensional projection, shown with tight-binding and first-principles methods.
Phonon excitations in 2D altermagnets produce magnon spin currents with d-wave symmetry that reverse direction when phonon frequency is tuned.
P-wave orbital magnetism protected by combined translation and time-reversal symmetry is proposed to originate from loop-current-induced orbital textures in a 2D Dirac lattice model, measurable via orbital Hall conductivity.
Symmetry analysis predicts anisotropic thermomagnonic torques in insulating altermagnets that induce domain-wall precession and direction-selective skyrmion motion under temperature gradients.
Magnetic instabilities in generic two-orbital systems are governed by the full interplay of the bare susceptibility tensor and spin interaction matrix, not solely by the quantum geometry of a single-channel susceptibility.
citing papers explorer
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Roughness-robust surface altermagnetism in $PT$ antiferromagnets
Roughness-robust surface altermagnetism is allowed only in PT-symmetric antiferromagnets and can be generated or suppressed by roughness averaging over compensated or uncompensated terminations.
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Novel 2D Altermagnetic Vanadium Oxide with a Buckled Lieb Structure
Monolayer V2O in a buckled Lieb structure is proposed as a room-temperature 2D altermagnet with 1.2 eV momentum-dependent spin splitting, out-of-plane anisotropy, and ~40 (ħ/e) S cm^{-1} spin Hall conductivity.
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Suppression of p-Wave Altermagnetism by Localized 4f Electrons in CeNiAsO
Localized Ce 4f electrons suppress p-wave altermagnetic band splitting in CeNiAsO's Ni 3d conduction bands to the few-meV scale.
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Correlation-driven tunability of altermagnetism in RuO$_2$
DFT+DMFT reveals RuO2 sits near the paramagnetic-altermagnetic boundary and itinerant-localized crossover, making its magnetic state tunable by minimal strain due to dynamical correlations.
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Strain continuously rotates the N\'eel vector in altermagnetic MnTe
Strain continuously rotates the Néel vector in altermagnetic MnTe, tuning its magnetic point group symmetry.
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$d$-wave Surface Altermagnetism in Centrosymmetric Collinear Antiferromagnets
Surface altermagnetism with d-wave spin splitting occurs in centrosymmetric collinear antiferromagnets only when no sublattice-exchanging antiunitary symmetry survives at the surface, as shown by symmetry analysis and first-principles calculations on V3Al and BaMn2Sb2 versus MnPt.
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Extended s-wave altermagnets
Extended s-wave altermagnets are introduced as fully gapped spin-compensated states with isotropic spin splitting arising from valley-exchange symmetries, shown via effective two-valley and microscopic models with guiding principles for identification.
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Weak-coupling altermagnetism and chiral magnetic excitations in a checkerboard lattice
Checkerboard-lattice Hubbard electrons are unstable to weak-coupling altermagnetism whose magnons display alternating chirality splitting.
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Floquet-induced anisotropic magnetoresistance and anomalous Hall effect in 2D $d$-wave altermagnets with Rashba spin-orbit coupling
Floquet driving in 2D d-wave altermagnets with Rashba SOC induces out-of-plane magnetization and equilibrium-forbidden AMR and AHE.
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Chiral-Angle-Controlled Altermagnetic Spin Splitting in Nanotubes
Rolling 2D d-wave altermagnets into nanotubes converts momentum-dependent spin splitting into chiral-angle-controlled 1D splitting via dimensional projection, shown with tight-binding and first-principles methods.
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Tunable Phonon-Driven Magnon Spin Currents in Altermagnets
Phonon excitations in 2D altermagnets produce magnon spin currents with d-wave symmetry that reverse direction when phonon frequency is tuned.
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$P$-wave Orbital Magnetism
P-wave orbital magnetism protected by combined translation and time-reversal symmetry is proposed to originate from loop-current-induced orbital textures in a 2D Dirac lattice model, measurable via orbital Hall conductivity.
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Thermomagnonic Torques in Insulating Altermagnets
Symmetry analysis predicts anisotropic thermomagnonic torques in insulating altermagnets that induce domain-wall precession and direction-selective skyrmion motion under temperature gradients.
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Reevaluating Quantum Geometric Criteria for Itinerant Magnetic Instabilities
Magnetic instabilities in generic two-orbital systems are governed by the full interplay of the bare susceptibility tensor and spin interaction matrix, not solely by the quantum geometry of a single-channel susceptibility.