Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 14, Pages 2197-2199Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2009.01.031
Keywords
Ferromagnetic nanowire; Magnetic domain wall; Depinning; Perpendicular magnetic anisotropy
Funding
- 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)
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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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