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Power Spintronics

#dynamics#spintronics #magnetic-materials

The flow of electron spins, the so-called “spin current”, is a key concept in the recent progress in

spintronics [1,2]. In ferromagnetic metals and semiconductors, the spin current interacts with

magnetization by the exchange interaction and induces the motion of the magnetization due to the angular

momentum conservation, the so-called spin transfer torque. Its inverse effect is called the spin-motive force

which is the electric voltage generated by the magnetization dynamics due to the energy conservation

between electrical current and magnetization [2,3]. The spin motive-force is derived by introducing spin

Berry phase in the Faraday’s law of electro-magnetism. Spin current is induced and manipulated by heat [4]

and mechanical motion [5-7] as well. The interconversion between various energies through spin current ,

the so-called “power spintronics”, will be discussed.

[1] “Spin Current” eds. S. Maekawa, et al. (Oxford University Press, 2012 and 2017),

[2] S. Maekawa, T. Kikkawa, H. Chudo, J. Ieda and E. Saitoh: J. Appl. Phys. 133, 020902 (2023).

[3] S.E. Barnes and S. Maekawa,: Phys. Rev. Lett. 98, 246601 (2007),

[4] K. Uchida, S. Maekawa, et al: IEEE Proc. 104, 1946 (2016),

[5] R. Takahashi, S. Maekawa, et al.: Nature Phys. 12, 52 (2016),

[6] R. Takahashi, S. Maekawa, et al.: Nature Commun. 11, 3009 (2020).

[7] J. Fujimoto, S. Maekawa, et al., Phys. Rev. B103, L220404 (2021) and PNAS Nexus 3 547 (2024).

BIO

Professor Sadamichi Maekawa is a renowned condensed matter physicist and a pioneer in

the field of spintronics. He received his Doctor of Science degree from Tohoku University in

1975 and has made groundbreaking contributions to the theory of strongly correlated

electron systems, spin transport, and magnetic nanostructures. His research has

significantly advanced the understanding of spin-dependent phenomena and their

applications in modern information technologies. Professor Maekawa has held numerous

leadership positions, including Director of the Advanced Science Research Center at the

Japan Atomic Energy Agency and Senior Advisor at the RIKEN Center for Emergent Matter

Science. He is currently Professor Emeritus at Tohoku University and serves as Science and Technology Advisor

to the Minister of Defense of Japan. His scientific excellence has been recognized through many prestigious

honors, including the IUPAP Magnetism Award and Néel Medal, the Humboldt Award, the Honda Memorial

Award, and fellowship in the American Physical Society. A Clarivate Highly Cited Researcher, Professor Maekawa

remains one of the most influential figures in condensed matter physics and spintronics worldwide.

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