Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.67: Poster

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

Proposal of a robust measurement scheme for the non-adiabatic spin torque using the displacement of magnetic vortices — •Benjamin Krüger¹, Massoud Najafi^2,3, Stellan Bohlens¹, Robert Frömter³, Dietmar Möller², and Daniela Pfannkuche¹ — ¹I. Institut für Theoretische Physik, Universität Hamburg — ²Arbeitsbereich Technische Informatik Systeme, Universität Hamburg — ³Institut für Angewandte Physik, Universität Hamburg

A spin-polarized current flowing through a ferromagnetic sample exerts a spin-torque on the local magnetic moments. This interaction can be described by adding two current-dependent torque terms to the Landau-Lifshitz-Gilbert equation.[1] The strength of the non-adiabatic spin torque is under debate since measurements differ by one order of magnitude.

A vortex in a micro- or nanostructured magnetic thin-film element is a promising system for the investigation of the spin-torque effect. It is known that vortices are displaced from their equilibrium position when excited by spin-polarized electric currents. The spatial confinement of the vortex core within the film element yields an especially accessible system for measurements. Based on analytical calculations[2] it is possible to derive a robust scheme which allows to measure the contributions due to the adiabatic spin torque, the non-adiabatic spin torque, and the Oersted field separately.

[1] S. Zhang and Z. Li, Phys. Rev. Lett. 93, 127204 (2004)

[2] B. Krüger et al., Phys. Rev. B 76, 224426 (2007)