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Time-resolved Kerr microscopy of coupled transverse domain walls in a pair of curved nanowires

Keatley, P. S., Yu, W., O'Brien, L., Read, Daniel, Cowburn, R. P. and Hicken, R. J. 2014. Time-resolved Kerr microscopy of coupled transverse domain walls in a pair of curved nanowires. Journal of Applied Physics 115 (17) , 17D507. 10.1063/1.4865211

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Abstract

Time-resolved scanning Kerr microscopy has been used to directly observe magnetostatically coupled transverse domain walls (TDWs) in a pair of closely spaced, curved nanowires (NWs). Kerr images of the precessional response of the magnetic domain to either side of the TDW revealed the TDW as a minimum in the Kerr signal in the region of closest NW separation. When the TDWs were ejected from the NW pair, the minimum in the Kerr signal was no longer observed. By imaging this transition, the static de-coupling field was estimated to be in the range from 38 to 48 Oe in good agreement with a simple micromagnetic model. This work provides a novel technique by which DC and microwave assisted decoupling fields of TDWs may be explored in NW pairs of different width, separation, and curvature.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: American Institute of Physics
ISSN: 0021-8979
Funders: EU Grant Master No. NMP-FP7-212257, UK EPSRC Grant Ref. EP/I038470/1, EU FP7 Project 3SPIN No. 247368, Marie Curie IOF Project No. 299376
Date of Acceptance: 7 November 2013
Last Modified: 18 Feb 2019 14:12
URI: http://orca.cf.ac.uk/id/eprint/57773

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