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

被引：17

作者：

He, Kai ^{[1
]}

Smith, David J. ^{[2
]}

McCartney, Martha R. ^{[2
]}

机构：

[1] Arizona State Univ, Sch Mat, Tempe, AZ 85287 USA

[2] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 18期

关键词：

chirality; electron holography; ferromagnetic materials; magnetic domain walls; magnetic hysteresis; nanowires; nucleation; Permalloy;

D O I：

10.1063/1.3261753

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

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页数：3

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