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Magnetic imaging of the pinning mechanism of asymmetric transverse domain walls in ferromagnetic nanowires

Petit, Dorothee, Zeng, Huang T., Sampaio, Joao, Lewis, Emma, O'Brien, Liam, Jausovec, Ana-Vanessa, Read, Daniel, Cowburn, Russell P., O'Shea, Kerry J., McVitie, Stephen and Chapman, John N. 2010. Magnetic imaging of the pinning mechanism of asymmetric transverse domain walls in ferromagnetic nanowires. Applied Physics Letters 97 (23) , pp. 233102-233105. 10.1063/1.3523351

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Abstract

The pinning of asymmetric transverse magnetic domain walls by constrictions and protrusions in thin permalloy nanowires is directly observed using the Fresnel mode of magnetic imaging. Different domain wall (DW)/trap configurations are initialized using in situ applied magnetic fields, and the resulting configurations are imaged both at remanence and under applied fields. The nature of the chirality dependent pinning potentials created by the traps is clearly observed. The effect of the asymmetry of the DW is discussed. Micromagnetic simulations are also presented, which are in excellent agreement with the experiments.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: chirality, ferromagnetic materials, Fresnel diffraction, magnetic domain walls, micromagnetics, nanomagnetics, nanowires, Permalloy, remanence
Publisher: American Institute of Physics
ISSN: 0003-6951
Last Modified: 04 Jun 2017 03:09
URI: http://orca.cf.ac.uk/id/eprint/17408

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