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Observation of asymmetrical pinning of domain walls in notched Permalloy nanowires using electron holography

Appl. Phys. Lett. 95, 182507 (2009); doi:10.1063/1.3261753

Published 6 November 2009

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Kai He,1 David J. Smith,2 and Martha R. McCartney2
1School of Materials, Arizona State University, Tempe, Arizona 85287, USA
2Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
Field-driven domain-wall motion and pinning in notched Permalloy nanowires have been observed using electron holography and Lorentz microscopy. Transverse domain walls (TDWs) were identified and different aspects of their behavior, including nucleation, injection, pinning, and depinning, were studied. The relative chirality (i.e., sense of field rotation) of the notch and the nucleation pad had a major influence in determining the TDW propagation: the walls were preferentially pinned for a notch of opposite chirality, but simply passed through when the notch had the same chirality. This asymmetrical TDW pinning accounts for the observed asymmetrical hysteresis hoop. ©2009 American Institute of Physics
History: Received 21 September 2009; accepted 19 October 2009; published 6 November 2009
Permalink: http://link.aip.org/link/?APPLAB/95/182507/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.60.Ch
    Magnetic domain walls and domain structure
  • 75.50.Bb
    Ferromagnetism of Fe and its alloys
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • YEAR: 2010

PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
AIP is a member of CrossRef AIP

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