Depinning Field at Notches of Ferromagnetic Nanowires With Perpendicular Magnetic Anisotropy

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In this paper, we experimentally characterize the domain-wall depinning mechanism at notches of ferromagnetic nanowires with perpendicular magnetic anisotropy. A time-resolved magneto-optical Kerr effect detection reveals that the depinning time is exponentially proportional to the strength of external magnetic field. From an analysis based on Neel-Brown theory, the depinning field and the activation volume are quantitatively determined for several notches with different gap distances. Interestingly, both the depinning field and the activation volume are proportional to the inverse of the gap distance. This is explained by the sizeable extrinsic effect from geometric constrictions in contrast to the intrinsic properties of the films
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2009-10
Language
English
Article Type
Article; Proceedings Paper
Keywords

WALL-MOTION; DOMAIN

Citation

IEEE TRANSACTIONS ON MAGNETICS, v.45, no.10, pp.4056 - 4058

ISSN
0018-9464
DOI
10.1109/TMAG.2009.2024893
URI
http://hdl.handle.net/10203/214025
Appears in Collection
PH-Journal Papers(저널논문)
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