Depinning Field at Notches of Ferromagnetic Nanowires With Perpendicular Magnetic Anisotropy

Title
Depinning Field at Notches of Ferromagnetic Nanowires With Perpendicular Magnetic Anisotropy
Authors
김갑진김기홍이재철안성민이강수조영진이창원서선애신경호최석봉
Keywords
Activation volume; depinning field; gap distance; notch; perpendicular magnetic anisotropy
Issue Date
2009-10
Publisher
IEEE transactions on magnetics
Citation
VOL 45, NO 10, 4056-4058
Abstract
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 Néel–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.
URI
http://pubs.kist.re.kr/handle/201004/41295
ISSN
0018-9464
Appears in Collections:
KIST Publication > Article
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