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Regensburg 2016 – wissenschaftliches Programm

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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 Braecher1,3, Philipp Pirro1,4, Tobias Fischer1, Alexander A. Serga1, Hiroshi Naganuma2, Koki Mukaiyama2, Mikihiko Oogane2, Yasuo Ando2, and Burkard Hillebrands11Fachbereich 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 Co2Mn0.6Fe0.4Si (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.

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