Predictable gate-field control of spin in altermagnets with spin-layer coupling

Abstract

Spintronics, a technology harnessing electron spin for information transmission, offers a promising avenue to surpass the limitations of conventional electronic devices. While the spin directly interacts with the magnetic field, its control through the electric field is generally more practical, and has become a focal point in the field of spintronics. Current methodologies for generating spin polarization via an electric field generally necessitate spin-orbit coupling. Here, we propose an innovative mechanism that accomplishes this task without dependence on spin-orbit coupling. Our method employs two-dimensional altermagnets with valley-mediated spin-layer coupling (SLC), in which electronic states display symmetry-protected and valley-contrasted spin and layer polarization. The SLC facilitates predictable, continuous, and reversible control of spin polarization using a gate electric field. Through symmetry analysis and ab initio calculations, we pinpoint high-quality material candidates that exhibit SLC. We ascertain that applying a gate field of $0.2$ eV/Å~ to monolayer Ca(CoN)${}_2$ can induce significant spin splitting up to 123 meV. As a result, perfect and switchable spin/valley-currents, and substantial tunneling magnetoresistance can be achieved in these materials using only a gate field. These findings provide new opportunities for generating predictable spin polarization and designing novel spintronic devices based on coupled spin, valley and layer physics.

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• Spin-Polarized Antiferromagnetic Spintronics
• Coulomb Drag in Altermagnets
• Crystal valley Hall effect
• Electrical switching of altermagnetism
• Topological responses from gapped Weyl points in 2D altermagnets
• Design of altermagnetic models from spin clusters
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• Contrasting Light-Induced Spin Torque in Antiferromagnetic and Altermagnetic Systems
• Quasi-one-dimensional spin transport in altermagnetic $Z^3$ nodal net metals
• All-electrically controlled spintronics in altermagnetic heterostructures
• Dynamical Generation of Higher-order Spin-Orbit Couplings, Topology and Persistent Spin Texture in Light-Irradiated Altermagnets
• Transition from antiferromagnets to altermagnets: Symmetry-Breaking Theory
• Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations
• From local spin nematicity to altermagnets: Footprints of band topology
• Ferroelectric Antiferromagnetic Lifting of Spin-Valley Degeneracy
• Quantum geometry and $X$-wave magnets with $X=p,d,f,g,i$
• Valley-dependent electronic properties in two-dimensional altermagnetic iron-based transition metal chalcogenides
• Unconventional compensated magnetic material LaMn${}_2$SbO${}_6$
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• Electrical Control of the Exchange Bias Effect at Model Ferromagnet-Altermagnet Junctions
• Zeeman-type spin splittings in strained d-wave altermagnets
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• Topological switching in bilayer magnons via electrical control
• Altermagnetism and Anomalous Transport in Ag${}^{2+}$ Fluorides: KAgF${}_3$ and K${}_2$AgF${}_4$
• Tunneling magnetoresistance in a junction made of $X$-wave magnets with $X=p,d,f,g,i$
• Realizing giant valley polarization effect based on monolayer altermagnets
• Tailoring Corner States and Exceptional Points in Altermagnets
• Electrically switchable non-relativistic Zeeman spin splittings in collinear antiferromagnets
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• Geometric Interpretation of Sensitivity to Structured Uncertainties in Spintronic Networks
• Ferroelectric Switchable Topological Magnon Hall Effect in Type-I Multiferroics
• Altermagnetism from the viewpoint of chemistry
• Antiferroaxial altermagnetism