Domain Nucleation and Annihilation in Uniformly Magnetized State under Current Pulses in Narrow Ferromagnetic Wires

Akira Tonomura; Ken Harada; Takashi Kimura; Tetsuya Akashi; Tsuyoshi Matsuda; Yoshichika Otani; Yoshihiko Togawa

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Domain Nucleation and Annihilation in Uniformly Magnetized State under Current Pulses in Narrow Ferromagnetic Wires

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arxiv cond-mat/0612383 v2 pith:P5H23ER4 submitted 2006-12-15 cond-mat.mtrl-sci cond-mat.mes-hall

Yoshihiko Togawa , Takashi Kimura , Ken Harada , Tetsuya Akashi , Tsuyoshi Matsuda , Akira Tonomura , Yoshichika Otani This is my paper · ORCID

classification cond-mat.mtrl-scicond-mat.mes-hall

keywords magneticcurrentdynamicsfoundmagnetizationmagnetizednarrowpulses

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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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