Measurement of the nucleation and domain depinning field in a single Co/Pt multilayer dot by Anomalous Hall effect |
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Authors: | M. DelalandeJ. de Vries L. Abelmann J.C. Lodder |
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Affiliation: | MESA+Research Institute for Nanotechnology, University of Twente, Enschede, The Netherlands |
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Abstract: | Co/Pt multilayer dots with perpendicular anisotropy and with diameters of 250 and 350 nm were fabricated on top of a Hall cross configuration. The angular dependence of the magnetic reversal of the individual dot was investigated by Anomalous Hall effect measurements. At near in-plane angles (85° with the magnetic easy axis) the dot switches partially into a stable two-domain state. This allows for separate analysis of the angular dependence of both the field required for nucleation of a reversed domain, and the field required for depinning of the domain wall. The angular dependence of the depinning field fits accurately to a 1/cos(θ) behavior, whereas the angular dependence of the nucleation field shows a minimum close to 45°. The latter dependency can be accurately fitted to the modified Kondorsky model proposed by Schumacher [1]. |
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Keywords: | Magnetic data storage Domain nucleation Anomalous Hall Effect |
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