Berlin 2018 – wissenschaftliches Programm
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PRV: Preisträgervorträge
PRV I
PRV I: Preisträgervortrag
Montag, 12. März 2018, 13:15–13:45, H 1012
Fabrication and characterization of spin Hall nano-oscillators — •Toni Hache1,2, Tillmann Weinhold1,3, Kai Wagner1,3, Nana Nishida1, Sri Sai Phani Kanth Arekapudi2, Tobias Hula1, Olav Hellwig1,2, and Helmut Schultheiss1,3 — 1Helmholtz-Zentrum Dresden - Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, 01328 Dresden, Germany — 2Institut für Physik, TU Chemnitz, D-09107 Chemnitz — 3TU Dresden, 01328 Dresden, Germany --- Laureate of the Georg-Simon-Ohm-Prize
Spin-Hall nano-oscillators (SHNOs) are modern auto-oscillation devices. Their simple geometry allows for an optical characterization by Brillouin-Light-Scattering microscopy 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 BLS measurements of auto-oscillations in Co60Fe20B20(5nm)/Pt(7 nm) based samples. The precession amplitude in these samples can be driven far from equilibrium, resulting in clear nonlinear signatures in the spinwave spectra. The spatial distributions of the observed modes and current dependencies are shown. Furthermore it is shown how the auto-oscillations can be locked to an external harmonic stimulus realized by an added microwave current. Moreover, a new type of SHNO using spin textures without applied external magnetic field is referenced.