Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Magnonics I
MA 31.7: Vortrag
Mittwoch, 14. März 2018, 17:00–17:15, H 0110
Reprogrammable, zero-field spin-Hall nano-oscillators based on domain walls — Nana Nishida1, Toni Hache1,3, Sri Sai Phani Kanth Arekapudi3, Olav Hellwig1,3, and •Helmut Schultheiss1,2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Dresden, Germany — 2TU Dresden, Germany — 3TU Chemnitz, Germany
Spin-Hall nano-oscillators are nano-scale devices for the generation of magnons and rf-signals. They are based on pure spin currents generated by the spin-Hall effect in heavy metals and the subsequent spin-transfer-torque acting on the magnetization of an adjacent ferromagnetic layer. This transfer of angular momentum can compensate the intrinsic damping of the ferromagnetic layer which results in auto-oscillations of the magnetization. For a high efficiency of this transfer of angular momentum in bilayers of a heavy metal and a ferromagnet, the magnetization needs to be perpendicular to the direction of the injected dc current. Typically, this requires the application of large external magnetic fields. We present an approach based on magnetic domain walls in nano-wires which shows strongly confined auto-oscillations without the application of any magnetic field.