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Substantial reduction in the depinning field of vortex domain walls triggered by spin-transfer induced resonance

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9 Author(s)
Nozaki, T. ; Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan ; Maekawa, H. ; Mizuguchi, M. ; Shiraishi, M.
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An influence of spin-transfer-induced resonant excitation of a vortex magnetic domain wall on magnetization reversal process was investigated in Permalloy nanowires. Sizable reduction of the depinning field was observed under an application of radio frequency current when the frequency coincided with resonance of the vortex core. The resonant frequency was found to increase by shrinking the wire width. These results lead the authors to conclude that the spin-transfer-induced resonant excitation assists the depinning of the vortex domain walls. This provides an important insight for the realization of novel magnetic memory and logic devices based on current-driven domain wall manipulation.

Published in:

Applied Physics Letters  (Volume:91 ,  Issue: 8 )

Date of Publication:

Aug 2007

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