Spin mechatronics: Mechanical generation of spin current

Seminar

  • Datum: 07.12.2018
  • Uhrzeit: 10:30
  • Vortragender: Prof. Sadamichi Maekawa
  • RIKEN Center for Emergent Matter Science, Wako, Japan and Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing, China
  • Ort: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle (Saale)
  • Raum: Lecture Hall, B.1.11
Spin mechatronics: Mechanical generation of spin current

The study on coupling between magnetism and mechanical rotation has a long history [1,2]. The phenomena due to the coupling are caused by the angular momentum conservation between electron spin and mechanical rotation, which has been proved in the general relativistic quantum mechanics [3]. We introduce mechanical effects in spintronics and propose a variety of novel spintronics phenomena [4]. We have observed the generation of spin current by the flow of liquid metals [5]. Combining this effect with the spin Hall effect, the spin-hydrodynamic generation of electricity is obtained [6]. We also show the spin current generation by surface acoustic waves in normal metals [7]. The mechanical generation of spin current opens a door from “Spintronics” to "Spin-Mechatronics".

[1] A.Einstein and W.J.de Haas, Verhandl.Deut.Physik.Ges, 17,154 (1915).

[2] S.J.Barnett, Phys. Rev. 6, 239 (1915).

[3] M.Matsuo, J.Ieda and S.Maekawa, Phys. Rev. Lett. 106, 076601 (2011).

[4] Spin Current (Second Edition), eds. S. Maekawa et al. (Oxford University Press, 2017).

[5] R.Takahashi, M.Ono, K.Harii, S.Okayasu, M.Matsuo, J.Ieda, S.Takahashi, S.Maekawa and E.Saitoh, Nature Phys. 12, 52 (2015).

[6] M.Matsuo, Y.Ohnuma and S.Maekawa: Phys. Rev. B96, 020401(R)(2017).

[7] D.Kobayashi,T.Yoshikawa,M.Matsuo,R.Iguchi,S.Maekawa,E.Saitoh and Y.Nozaki, Phys. Rev. Lett. 119, 077202 (2017).

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