MSE Colloquium - Prof. Sadamichi Maekawa
Date: November 22, 2013 from 11:00 am to 12:00 pm EST
Location: Room 833, S.W. Mudd
Contact: For further information regarding this event, please contact Wesley Hattan by sending email to or by calling 2128547860.
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"Spin-Motive Force as a New Energy Conversion Mechanism"

Sadamichi Maekawa
Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
CREST, Japan Science and Technology Agency, Tokyo 102-0075, Japan

The force acting on the electric charge of an electron gives rise to the electro-motive force. This is the Faraday's law in the classical electromagnetism discovered in 1831. It is noted that the modern electric industry started with this law [1].

Here we show that the force acting on the electron spin gives rise to a motive force, i.e., "spin-motive force". This generalized Faraday's law [2,3] reflects the conservation of the magnetic energy of a ferromagnet with the electrical energy of the conduction electrons via the mutual exchange interaction.

We discuss that the spin-motive force may play a key role in spin-electronics, i.e., spintronics [4].


[1] The Feynman Lecture on Physics, Vol.12 (1964).

[2] Concepts in Spin Electronics, ed. S. Maekawa (Oxford University Press, 2006).

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

[4] Spin Current, eds. S. Maekawa et al. (Oxford University Press, 2012).