Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Spin Dynamics and Transport: Spin Excitations and Spin Torque Phenomena
MA 48.1: Vortrag
Donnerstag, 23. März 2017, 09:30–09:45, HSZ 101
Micron sized tapered spin hall oscillators under the influence of external microwave signals — •Kai Wagner1,2, Andrew Smith3, Tobias Hula1, Toni Hache1, Jürgen Lindner1, Ilya Krivorotov3, and Helmut Schultheiss1,2 — 1HZDR, Institute of Ion Beam Physics and Materials Research, D-01328, Germany — 2TU Dresden, D-01062 Dresden, Germany — 3Department of Physics and Astronomy, University of California, Irvine, California, USA.
We investigate by Brillouin-Light-Scattering microscopy the spatial dependent auto-oscillation spectra of tapered permalloy wires [1] when subjected to spin-orbit-torques generated via the spin hall effect in an underlying Platinum layer. We first identify the different spectral contributions to the integral auto-oscillation signal across the spatially varying SHO. Subsequently the influence of external microwave signals on these spectra are investigated. Strongly amplified signals are observed, when the microwave frequency matches those of the auto-oscillations even for microwave powers, which are sufficiently small to not excite magnetisation dynamics outside of the auto-oscillatory regime. We believe this can be attributed to locking of the non-isochronus SHO to the external microwave signals resulting in spectrally narrower auto-oscillations with differing spatial extend. The authors acknowledge financial support from the Deutsche Forschungsgemeinschaft within programme SCHU 2922/1-1.
[1]: Liu Yang et al. , Scientific reports 5, 16942 EP, 2015