January 2019

Sadamichi Maekawa RIKEN, Japan - Seminar


PRESENTER:   Prof. Sadamichi Maekawa

INSTITUTE:     RIKEN Center for Emergent Matter Science, Wako, 351-0198, Japan,

                     Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.

DATE:             Tuesday, January 8th, 2018

TIME:             2 p.m. - 3.30 p.m.

LOCATION:     Ibn Sina Building B3/L5/R5220

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] See, for example, 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).



Sadamichi Maekawa is the Director of Advanced Science Research Center, Japan Atomic Energy Agency. He received his PhD degree from Tohoku University. He was a Post Doctoral Fellow at IBM Watson Research Center, Professor at Nagoya University and Tohoku University. He has been awarded a Humboldt Award in 2001, the title of Honda Professor in 2005, a Fellow of the American Physical Society in 2007, and the title of the Distinguished Professor in 2008. His main research topics are solid state theory including theory of electronic properties in strongly correlated electron systems and theory of transport in magnetic nanostructures.