Giant and Tunneling Magnetoresistance in Unconventional Collinear Antiferromagnets with Nonrelativistic Spin-Momentum Coupling
By L. Šmejkal, A. B. Hellenes, R. González-Hernández, J. Sinova, T. Jungwirth. Physical Review X, 2021
381 citations recorded by the source corpus.
Giant or tunneling magnetoresistance are physical phenomena used for reading information in commercial spintronic devices. The effects rely on a conserved spin current passing between a reference and a sensing ferromagnetic electrode in a multilayer structure. Recently, we have proposed that these fundamental spintronic effects can be realized in collinear antiferromagnets with staggered spin-momentum exchange interaction, which generates conserved spin currents in the absence of a net equilibrium magnetization. Here we elaborate on the proposal by presenting archetype model mechanisms for the antiferromagnetic giant and tunneling magnetoresistance effects. The models are based, respectively, on anisotropic and valley-dependent forms of the non-relativistic staggered spin-momentum interaction. Using first principles calculations we link these model mechanisms to real antiferromagnetic materials and predict a $\sim$100\% scale for the effects. We point out that besides the GMR/TMR detection, our models directly imply the possibility of spin-transfer-torques excitation of the antiferromagnets.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/4098ece4f5ada59a4b49833e1a6dce4ed4b17739
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In Atomic and Molecular Physics, and Optics
In Condensed Matter Physics
Citations in the corpus
- Topological superconductivity in two-dimensional altermagnetic metals (2023, background): “Recently, it has been observed in a series of materials with compensated magnetization that a third basic collinear magnetic order 16–29 , referred to as altermagnetism (AM) 30–32 , exists beyond the conventional dichotomy between ferromag-netism and antiferromagnetism.”