Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.80: Poster

Friday, April 4, 2014, 10:30–13:30, P2

High Resolution Imaging of Spin Current-driven Magnetization Manipulation in Nanoscale Structures using SEMPA — •Pascal Krautscheid, Robert M. Reeve, and Mathias Kläui — Institut für Physik, Johannes Gutenberg-Universität, 55128 Mainz, Germany

The utilization of the electron spin degree of freedom, instead of its charge, was proposed to manipulate the magnetic state of a system including the domain wall spin configuration. The interaction between a spin current and the magnetic moments of a system can be described by the implicit Landau-Lifshitz-Gilbert equation [1]. However, the origin of the non-adiabatic spin torque and its relation to the damping is not well understood and several theoretical predictions exist, which can only be distinguished by experiments. We consider a magnetic vortex state within a permalloy-disk and measure the vortex core displacement to gain information about the non-adiabatic spin torque [2]. By altering the damping, e.g. using a rare earth element as a dopant [3] the relation between the damping and the non-adiabatic spin torque can be derived. The vectorial magnetization information within the plane of our nanoscale structure is measured by a scanning electron microscope with polarization analysis, which offers the necessary high-resolution magnetic imaging.

References

[1] A. Thiaville et al., Europhys. Lett. 69, 990 (2005).

[2] B. Krüger et al., Phys. Rev. Lett. 104, 077201 (2010).

[3] T. A. Moore et al., Phys. Rev. B 80, 132403 (2009).