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

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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.

Original languageEnglish (US)
Article number182507
JournalApplied Physics Letters
Issue number18
StatePublished - Nov 16 2009


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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