Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
Volume 45, Issue 46-50, Pages L1322-L1324Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.45.L1322
Keywords
current-driven magnetization dynamics; magnetic domain nucleation; annihilation; Lorentz microscopy; electron holography
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We investigate the current-driven magnetization dynamics in narrow Permalloy wires by means of Lorentz microscopy and electron holography. Current pulses are found to transform the magnetic structure in the uniformly magnetized state below the Curie temperature. A variety of magnetic states including reversed magnetic domains are randomly obtained in low probability. The dynamics of vortices found in most of observed magnetic states seems to play a key role in triggering the magnetization reversal.
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