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Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.34: Poster

Friday, March 26, 2010, 11:00–14:00, Poster B1

Domain-wall types and switching fields in magnetic nanowires with perpendicular magnetic anisotropy determined by micromagnetic simulations — •Theo Gerhardt1, Judith Moser1, Andreas Vogel1, André Kobs1, Guido Meier1, and Markus Bolte1,21Institut für Angewandte Physik, Universität Hamburg, Germany — 2Arbeitsbereich Technische Informatik Systeme, Department Informatik, Universität Hamburg, Germany

Magnetic multilayers with perpendicular magnetic anisotropy are a well known material system with potential application e.g. in storage concepts based on current-driven domain-wall motion [1]. We present a systematic investigation of the influence of the material parameters of a thin nanowire, i.e., saturation magnetization MS, anisotropy constant K1, and exchange constant A, on the domain-wall type and the switching field via micromagnetic simulations. For low K1 and high MS, the multilayers have in-plane magnetization, while for high K1 and low MS, the magnetization of the wire points out-of plane with Bloch walls separating the domains. At the phase boundary, Néel walls predominate. The switching fields are found to decrease with increasing MS and decreasing K1, but are much larger than in comparable experiments, even when edge roughness is considered in the simulations. By introducing a local variation of the material parameters, as was recently done in Ref. [2], good agreement with experimental data is achieved. [1] S. S. P. Parkin et al., Science 320, 190 (2008), [2] C. Burrowes et al., Nature Physics, Adv. Online Publication Nov. (2009), DOI:10.1038/NPHYS1436

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