Nanometer scale observation of high efficiency thermally assisted current-driven domain wall depinning.
Nanometer scale observation of the depinning of a narrow domain wall (DW) under a spin current is reported. We studied approximately 12 nm wide 1D Bloch DWs created in thin films exhibiting perpendicular magnetic anisotropy. Magnetotransport measurements reveal thermally assisted current-driven DW motion between pinning sites separated by as little as 20 nm. The efficiency of current-driven DW motion assisted by thermal fluctuations is measured to be orders of magnitude higher than has been found for in-plane magnetized films, allowing us to control DW motion on a nanometer scale at low current densities.
Ravelosona
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Hitachi Global Storage Technologies, San Jose Research Center, 650 Harry Road, San Jose, California 95120 USA.
Lacour
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D
Katine
J A
JA
Terris
B D
BD
Chappert
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C