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Field- and current-induced domain-wall motion in permalloy nanowires with magnetic soft spots

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10 Author(s)
Vogel, Andreas ; Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, 20355 Hamburg, Germany ; Wintz, Sebastian ; Gerhardt, Theo ; Bocklage, Lars
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We study field- and current-induced domain-wall motion in permalloy nanowires containing a square-shaped magnetically softened region. Implantation of chromium ions is used to induce pinning sites via a local reduction in the saturation magnetization. Micromagnetic simulations, magnetic transmission soft x-ray microscopy, and electrical measurements are employed to characterize the pinning potential which significantly differs for transverse and vortex walls. Reliable domain-wall depinning from a so-called magnetic soft spot by single current pulses is observed. This demonstrates the suitability of these pinning sites for applications.

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Applied Physics Letters  (Volume:98 ,  Issue: 20 )