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MA: Fachverband Magnetismus

MA 16: Magnetization and Demagnetization Dynamics I

MA 16.8: Vortrag

Dienstag, 8. März 2016, 11:30–11:45, H34

Control of the effective spin-wave damping in Heusler-Pt waveguides via the spin-transfer torque effect — •Thomas Meyer¹, Thomas Braecher^1,3, Philipp Pirro^1,4, Tobias Fischer¹, Alexander A. Serga¹, Hiroshi Naganuma², Koki Mukaiyama², Mikihiko Oogane², Yasuo Ando², and Burkard Hillebrands¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — ²Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan — ³curr. affiliation: Univ. Grenoble Alpes, CNRS, CEA, INAC-SPINTEC, 17 rue des Martyrs, 38054 Grenoble, France — ⁴curr. affiliation: Institut Jean Lamour, Université Lorraine, CNRS, 54506 Vandœuvre-lès-Nancy, France

We present the control of the effective spin-wave damping by the spin-transfer torque (STT) exerted by a pure spin current injected into Heusler compound microstructured waveguides. The here used Cobalt-based Heusler compound Co₂Mn_0.6Fe_0.4Si (CMFS) already provides a comparably low Gilbert damping, thus, this material is very promising for the use in future spintronic devices. In this work, via the STT effect, a pure spin current, generated in a Pt layer via the spin-Hall effect, can exert a torque on the magnetization in the adjacent CMFS layer. The obtained results show a strong influence of an applied DC current on the spin-wave properties. Investigations using only thermally excited spin waves exhibit a strongly increased spin-wave intensity due to a decreased effective damping. This shows the feasibility of using the STT effect in Heusler compound microstructures for future applications.