Kavli Affiliate: Mamoru Matsuo
| First 5 Authors: Xin Theng Lee, Xin Theng Lee, , ,
| Summary:
Altermagnets and compensated ferrimagnets have attracted considerable
attention as key building blocks in spintronics devices, owing to their dual
advantages of ferromagnets and antiferromagnets. In particular, compensated
ferrimagnets exhibit isotropic spin splitting in their electronic and magnon
dispersions, despite having zero net magnetization. This characteristic feature
enables spin transport phenomena analogous to those in ferromagnets. However,
quantitative evaluations of such spin transport phenomena, particularly in
comparison to conventional ferromagnets, remain unexplored. Here we investigate
spin pumping and spin Seebeck effects in a junction between a compensated
ferrimagnet and a normal metal using the non-equilibrium Green’s function
method. We find that the isotropic spin splitting in magnon dispersions gives
rise to spin transport phenomena similar to those observed in ferromagnets. Our
results provide a solid theoretical foundation for the applications of exotic
collinear antiferromagnets with spin splitting to spintronics devices.
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