Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Poster I
MA 16.19: Poster
Dienstag, 12. März 2013, 10:30–13:30, Poster D
Control of magnetization dynamics by pure spin currents — •Henning Ulrichs1, Vladislav Demidov1, Sergej Demokritov1, and Sergei Urazhdin2 — 1University of Muenster, Corrensstrasse 2-4, 48149 Muenster, Germany — 2Emory University, Atlanta, GA 30322, USA
Recent experiments have shown that pure spin currents can be used to realize efficient control of magnetization dynamics, opening new possibilities for implementation of high-frequency spintronic devices. Here, we review our experimental studies [1-4] on this subject using micro-focus Brillouin light scattering spectroscopy.
We demonstrate that pure spin currents can be utilized for wide-range control of the effective magnetic damping in micrometer-sized structures. In particular, we achieved a reduction of the damping coefficient significantly below values typical for the used magnetic material. This effect can be utilized for stimulation and electric control of nonlinear dynamic phenomena such as parametric spin-wave instability. In addition, we study the effect of pure spin currents on thermal magnetic fluctuations and show that they can be controllably enhanced or suppressed. Finally, we demonstrate excitation of coherent single-mode auto-oscillations in devices where the local injection of pure spin currents results in a complete compensation of damping.
1. Phys. Rev. Lett. 107, 107204 (2011)
2. Appl. Phys. Lett. 99, 172501 (2011)
3. Phys. Rev. B 86, 134420 (2012)
4. Nature Materials 11, 1028 (2012)