Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 45: Micromagnetism/ Computational Magnetics

MA 45.2: Talk

Wednesday, March 16, 2011, 17:45–18:00, HSZ 403

Depinning fields of domain-walls at defects and notches in magnetic nanowires with perpendicular magnetic anisotropy determined by micromagnetic simulations — •Theo Gerhardt¹, André Drews^1,2, and Guido Meier¹ — ¹Institut 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 [1,2]. For the feasibility of this concept the domain-walls need to get pinned at predefined positions which can be created by artificial defects or notches. Artificial defects are local reductions of the anisotropy constant K₁. We present a systematic investigation of the influence of the shape, size, and strength of the reduction of the anisotropy constant K₁ on the depinning field of domain-walls at defects. The depinning fields strongly depend on the shape of the defect and increase with a larger defect size and a stronger reduction of the anisotropy constant K₁. Furthermore the depinning fields at notches are systematically investigated in dependence on the shape and size of the notch. The shape of the notch has a significant influence on the maximal depinning field. Deeper notches cause an increase of the depinning field. Comparison between simulated and theoretical depinning fields of defects and notches reveal a good agreement. [1] S. S. P. Parkin et al., Science 320, 190 (2008), [2] Hironobu Tanigawa et al., Appl. Phys. Express 2 , 053002 (2009)