Transient, Quasi-Static and Translation without Precession : A Hybrid of Bloch-Neel Quasi-Static Wall in Motion

概要

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Domain wall motion under the influences of weak in-plane fields applied along arbitrary directions in an infinite medium with uniaxial anisotropy has been considered. Typically, the azimuthal angle of the magnetization vector along with the domain wall central plane exhibits transient, stationary and oscillatory behavior. The azimuthal angle displays a terrace-like structure at the critical field when subject to a weak perturbation field along the domain wall normal direction. As a result, the domain wall cants out its magnetization vector out of the wall plane and stays in that configuration as it continues to translate onward like a hybrid of Bloch-Neel wall in a quasi-static manner without precession. The in-plane field along the wall normal has limited effect on the domain wall upper bound velocity, while the field parallel to the domain wall can substantially increase it. At a higher drive field, the magnetization (φ) precesses nonuniformly with time and results in nonuniform, anharmonic oscillatory behavior for domain wall motion. Also, as domain wall picks up its velocity, it contracts to reduce its surface demagnetization energy and at the same time interchanges between Bloch type and Neel type in an oscillatory manner.
社団法人応用物理学会の論文
1993-05-15