Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 43: Magnetization / Demagnetization Dynamics III
MA 43.1: Talk
Thursday, March 19, 2015, 09:30–09:45, EB 301
Control of the effective damping in Heusler/Pt microstructures via the spin-transfer torque effect — •Thomas Meyer1, Thomas Brächer1, Philipp Pirro1, Tobias Fischer1, 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
We present the control of the effective spin-wave damping by the spin-transfer torque exerted by a pure spin current injected into Heusler compound microstructures. In this work, the pure spin current is generated by a DC current in a Pt layer adjacent to the magnetic layer via the spin-Hall effect. Especially, the used cobalt-based Heusler compound Co2Mn0.6Fe0.4Si used in this work already provides a comparably low Gilbert damping. Thus, this class of materials is very promising for the usage in any devices based on spin waves as only very low currents for the control of the effective damping are needed. 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. The measurements show the feasibility of using the spin-transfer torque effect to control the effective spin-wave damping in waveguides which is very promising for future applications using propagating spin waves to transfer information.