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Journal of Electron Microscopy 2005 54(supplement 1):i69-i74; doi:10.1093/jmicro/54.suppl_1.i69
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© The Author 2005. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please email: journals.permissions@oupjournals.org

Article

Microscopic theory of current-driven domain wall motion

Gen Tatara1,* and Hiroshi Kohno2

1 PRESTO, JST and Tokyo Metropolitan University, 1–1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan and 2 Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

* To whom correspondence should be addressed. E-mail: tatara{at}phys.metro-u.ac.jp

Abstract

The dynamics of a domain wall in ferromagnetic nanowires under electric current is theoretically studied. The driving mechanism is shown to depend on wall thickness. Thick walls, as in metallic wires, are propelled by the spin torque arising from spin polarization of current, while thin walls, as in nanocontacts and magnetic semiconductors, are driven by the pressure from charge current. The condition for small-current operation, which is a key issue when integrated into devices, is discussed.

Keywords     domain wall, spin torque, spin current

Received      7 August 2004, accepted 15 October 2004


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