Speaker : 加藤岳生氏（ISSP）

Date: May 2nd 17:00- 

Title: Spin pumping and spin Hall magnetoresistance as a probe of spin excitation

Abstract: Recently, various experimental techniques such as spin pumping and spin Hall magnetoresistance (SMR) have attracted interest as a probe of spin excitation in target materials [1]. After brief introduction of physical phenomena in spintronics, we present a theoretical framework for spin pumping and SMR and propose experimental setups for their application. We explain three examples; (i) spin pumping into superconductors [2], (ii) spin current noise in spin pumping [3], and (iii) SMR for a bilayer system composed of a metal layer and an antiferromagnetic layer [4]. We stress that our theoretical description is based on an analogy between spintronic and electronic transports.

[1] W. Han, S. Maekawa, and X.-C. Xie, Nat. Mater. 19, 139 (2020).

[2] T. Kato, Y. Ohnuma, M. Matsuo, J. Rech, T. Jonckheere, and T. Martin, Phys. Rev. B 99, 144411 (2019).

[3] M. Matsuo, Y. Ohnuma, T. Kato and S. Maekawa, Phys. Rev. Lett. 120, 235120 (2018).

[4] T. Kato, Y. Ohnuma, and M. Matsuo, Phys. Rev. B 102, 094437 (2020).