Spin-transfer torques in antiferromagnets: efficiency and quantification method
arXiv:1604.05277 · doi:10.1103/PhysRevB.94.054409
Abstract
We formulate a theory of spin-transfer torques in antiferromagnets, which covers the small to large limits of the exchange coupling energy relative to the kinetic energy of the inter-sublattice electron dynamics. Our theory suggests a natural definition of the efficiency of spin-transfer torques in antiferromagnets in terms of well-defined material parameters, revealing that the charge current couples predominantly to the antiferromagnetic order parameter and the sublattice-canting moment in, respectively, the limits of large and small exchange coupling. The effects can be quantified by analyzing the antiferromagnetic spin-wave dispersions in the presence of charge current: in the limit of large exchange coupling the spin-wave Doppler shift always occurs, whereas, in the opposite limit, the only spin-wave modes to react to the charge current are ones that carry a pronounced sublattice-canting moment. The findings offer a framework for understanding and designing spin-transfer torques in antiferromagnets belonging to different classes of sublattice structures such as, e.g., bipartite and layered antiferromagnets.
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- Spin-Transfer Torque in Altermagnets with Magnetic Textures
- Numerical Computation of Spin-Transfer Torques for Antiferromagnetic Domain walls
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- Microscopic Calculation of Spin Torques in Textured Antiferromagnets
- Cross effect of magnetic field and charge current on antiferromagnetic dynamics
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- Spin-transport, spin-torque and memory in antiferromagnetic devices: Part of a collection of reviews on antiferromagnetic spintronics
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- Current-Induced Spin-Wave Doppler Shift in Antiferromagnets
- Fast reversal of Néel vectors in antiferromagnets via domain-wall motion driven by vertically injected spin currents