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Title: Cross-over from coherent rotation to inhomogeneous reversal mode in interacting ferromagnetic nanowires
Authors: Vavassori, P.
Bonanni, V.
Gubbiotti, G.
Adeyeye, A.O. 
Goolaup, S. 
Singh, N.
Keywords: Magnetic properties of nanostructures
Magnetization reversal
Magnetostatic dipolar interaction
Issue Date: Sep-2007
Citation: Vavassori, P., Bonanni, V., Gubbiotti, G., Adeyeye, A.O., Goolaup, S., Singh, N. (2007-09). Cross-over from coherent rotation to inhomogeneous reversal mode in interacting ferromagnetic nanowires. Journal of Magnetism and Magnetic Materials 316 (2 SPEC. ISS.) : e31-e34. ScholarBank@NUS Repository.
Abstract: We have investigated the magnetization reversal mechanism and the effects of magnetostatic interaction in arrays of lithographically defined Permalloy nanowires with a fixed width of 185 nm, spacing of 35 nm and film thicknesses from 10 to 120 nm. The magnetization reversal has been investigated with vectorial Magneto-Optical Kerr Effect magnetometry. The vectorial hysteresis loops (in-plane magnetization components parallel and perpendicular to the applied field) recorded with the external field applied perpendicular to the length of the wires (hard magnetization direction), show a transition from coherent rotation to inhomogeneous reversal mode for wires' thickness above 80 nm. The effects of dipolar interactions are evidenced by the variation of the saturation field in the hard-axis hysteresis loops as a function of wires thickness. In detail, the analysis of the saturation field vs. wires thickness shows that the dipolar interactions start to play a role for wires thickness ≥20 nm. © 2007 Elsevier B.V. All rights reserved.
Source Title: Journal of Magnetism and Magnetic Materials
ISSN: 03048853
DOI: 10.1016/j.jmmm.2007.02.017
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