Engineering magnetic domain-wall structure in Permalloy nanowires

Benitez Romero, M. J., Basith, M., Lamb, R.J., McGrouther, D. , McFadzean, S., MacLaren, D. , Hrabec, A., Marrows, C.H. and McVitie, S. (2015) Engineering magnetic domain-wall structure in Permalloy nanowires. Physical Review Applied, 3(3), 034008. (doi: 10.1103/PhysRevApplied.3.034008)

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Using a focused-ion-beam microscope, we create nontopographic features that provide controlled modification of domain-wall structure, size, and pinning strength in 500-nm-wide nanowires composed from Cr(3  nm)/permalloy(10  nm)/Cr(5  nm). The pinning sites consist of linear defects where magnetic properties are modified by a Ga+-ion probe of diameter ∼ 10  nm. Detailed studies of the structural, chemical, and magnetic changes induced by the irradiation, which show the modified region to be ∼40–50  nm wide, are performed using scanning-transmission-electron-microscopy modes of bright-field imaging, electron-energy-loss spectroscopy, and differential-phase-contrast imaging on an aberration corrected (Cs) instrument. The Fresnel mode of Lorentz-transmission-electron microscopy is used for studies of domain-wall behavior, where we observe changes in depinning strength and structure with irradiation dose and line orientation. We present an understanding of this behavior based upon micromagnetic simulation of the irradiated defects and their effect on the energy terms for the domain walls.

Item Type:Articles
Glasgow Author(s) Enlighten ID:McVitie, Professor Stephen and MacLaren, Dr Donald and Benitez Romero, Dr Maria Jose and McGrouther, Dr Damien and Basith, Mr Mohammed and McFadzean, Dr Sam
Authors: Benitez Romero, M. J., Basith, M., Lamb, R.J., McGrouther, D., McFadzean, S., MacLaren, D., Hrabec, A., Marrows, C.H., and McVitie, S.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:MCMP
Journal Name:Physical Review Applied
Journal Abbr.:PR Applied
Publisher:American Physical Society
ISSN (Online):2331-7019
Published Online:26 March 2015
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in Physical Review Applied 3(3):034008
Publisher Policy:Reproduced under a Creative Commons License
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
547981Current-Driven Domain Wall Motion in Multilayer NanowiresStephen McvitieEngineering & Physical Sciences Research Council (EPSRC)EP/I013520/1P&A - PHYSICS & ASTRONOMY