Generation of electric-field-induced unconventional spin current

Abstract

Efficient generation of spin current is one of the primary goals of spintronics. In the first part, I shall talk about the electric-current-driven unconventional spin-current generation [1] using the novel spin-split bands of altermagnet RuO₂ [2], which could be a potential root to achieve the field-free switching of perpendicular magnet for high-density memory applications. In the next part of my talk, I shall discuss our recent results of thermal generation of spin current due to the spin Nernst torque of heavy metals such as Pt and W [3], which could be useful for energy harvesting spin-caloritronic research applications.

[1] A. Bose, N. J. Schreiber, R. Jain, D.-F. Shao, H. P. Nair, J. Sun, X. S. Zhang, D. A. Muller, E. Y. Tsymbal, D. G. Schlom, and D. C. Ralph, Tilted Spin Current Generated by the Collinear Antiferromagnet Ruthenium Dioxide, Nat. Electron. 5, 267 (2022).

[2] R. González-Hernández, L. Šmejkal, K. Výborný, Y. Yahagi, J. Sinova, T. Jungwirth, and J. Železný, Efficient Electrical Spin Splitter Based on Nonrelativistic Collinear Antiferromagnetism, Phys. Rev. Lett. 126, 127701 (2021).

[3] A. Bose, R. Jain, J. J. Bauer, R. A. Buhrman, C. A. Ross, and D. C. Ralph, Origin of Transverse Voltages Generated by Thermal Gradients and Electric Fields in Ferrimagnetic-Insulator/Heavy-Metal Bilayers, Phys. Rev. B 105, L100408 (2022).

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