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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Abstract
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 |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | McVitie, Professor Stephen and MacLaren, Professor 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: | 2331-7019 |
| 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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