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MA: Fachverband Magnetismus

MA 67: Poster 4

MA 67.17: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG3

Auto-oscillations in double constriction Spin-Hall nano-oscillators — •Toni Hache¹, Kai Wagner^1,2, Sri Sai Phani Kanth Arekapudi^1,3, Tobias Hula¹, Olav Hellwig^1,3, Jürgen Lindner¹, and Helmut Schultheiss^1,2 — ¹Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung — ²Technische Universität Dresden — ³Technische Universität Chemnitz

Spin-Hall nano-oscillators (SHNOs) are modern auto-oscillation devices. Their simple geometry allows for an optical characterization by Brillouin-Light-Scattering microscopy (µBLS) at room temperature. Here we report on the observation of auto-oscillations in constriction based SHNOs. These are devices where the current density is increased locally due to lateral confinement. Hence, the spin current generated by the spin Hall effect can create well defined hot-spots for auto-oscillations. We present µBLS measurements of auto-oscillations in Co₆₀Fe₂₀B₂₀(5 nm)/Pt(7 nm) based samples with two interacting, neighbouring nano-constrictions. The precession amplitude in these samples can be driven far from equilibrium, resulting in clear nonlinear signatures in the spin-wave spectra. The spatial distributions of the observed modes and current dependencies are shown.

The authors acknowledge financial support from the Deutsche Forschungsgemeinschaft within programme SCHU 2922/1-1.