期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 321, 期 14, 页码 2197-2199出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2009.01.031
关键词
Ferromagnetic nanowire; Magnetic domain wall; Depinning; Perpendicular magnetic anisotropy
资金
- Korea Science and Engineering Foundation [R0A-2007-000-20032-0]
- Seoul RBD program
- National Research Foundation of Korea [R0A-2007-000-20032-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We present an analytic theory of the domain wall depinning in magnetic nanostructure with perpendicular magnetic anisotropy. The variational principle reveals that the wall is bent in the form of a circular arc which intersects the structure boundaries perpendicularly. The radius is inversely proportional to the magnetic field. With increasing the field the radius shrinks, followed by depinning from the constriction when the arc is not geometrically allowed. The depinning field is proportional to the sine of the constriction angle and the inverse of the constriction width. The validity of the theory is confirmed by comparison with the micromagnetic simulation. (C) 2009 Elsevier B.V. All rights reserved.
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