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MA: Fachverband Magnetismus

MA 9: Spin Excitations/Spin Torque

MA 9.12: Talk

Monday, March 16, 2015, 18:30–18:45, H 0112

Vortex Core Motion driven by Thermal Spin Transfer Torque — •Michael Vogel¹, Jean-Yves Chauleau¹, Claudia Mewes², Tim Mewes², and Christian Back¹ — ¹Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Regensburg, Germany — ²MINT Center / Depeartment of Physics and Astronomy, University of Alabama, Tuscaloosa, AL, USA

The dynamical properties of spin caloric devices play a key role in their design and functionality. Especially the estimation of the required temperature gradients is essential for a successful development of new spin caloritronic applications and experiments. We report on theoretical investigations of magnetic vortex motion driven by thermal spin transfer torque for static and time dependent temperature gradients. The magnetization dynamic of the vortex core is well described by the Landau-Lifshitz-Gilbert equation including the adiabatic and non-adiabatic spin transfer torque term [S. Zhang and Z. Li, Phys. Rev. Lett 93, 127204 (2004)]. Using the Onsager relations within a three current model [S.D. Brechet, and J.-P. Ansermet, Phys. Status Solidi RRL 5, No. 12, 423*425 (2011); K.M.D. Hals, A. Brataas, and G.E.W. Bauer, Solid State Com. 150, 461465 (2010)] one can write the involved current density as a spin polarization factor times a current density derived from the temperature gradient which is determined by experimental measurements in combination with finite element calculations. We report on the dynamic behavior of such systems and the importance of the interplay of the spatial and temporal shape of the heat gradient in combination with the geometry of the magnetic structure.