Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Spin Dynamics and Transport: Spin Excitations and Spin Torque Phenomena
MA 48.2: Vortrag
Donnerstag, 23. März 2017, 09:45–10:00, HSZ 101
Spin-wave heating vs. Joule heating in spin-Hall-effect and spin-transfer-torque driven Cr|Heusler|Pt waveguides — •Thomas Meyer1, Philipp Pirro1, Thomas Brächer1,3, Frank Heussner1, Alexander Serga1, Hiroshi Naganuma2, Koki Mukaiyama2, Mikihiko Oogane2, Yasuo Ando2, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan — 3current affiliation: Université Grenoble Alpes, CNRS, CEA, INAC-SPINTEC, 38054 Grenoble, France
We present time-resolved Brillouin light scattering measurements on spin-Hall-effect and spin-transfer-torque driven magnetization dynamics in a microstructured Cr|Heusler|Pt waveguide. Reducing the effective spin-wave damping, a strong increase in the magnon density is observed which is accompanied by a reduction of the spin-wave frequency. By evaluating the temporal behavior of these effects and comparing these to COMSOL multiphysics simulations, we can identify spin waves as the main heating source in the investigated structure. Correlating the spin-wave frequency to the magnon density for different applied current values proves that Joule heating by the applied current can be neglected. The results show that, in any application using the spin-transfer torque effect, the contribution to the temperature increase by an increased magnon density needs to be considered. Financial support by the DFG (TRR 173 ’Spin+X’) is acknowledged.