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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.61: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Ultrafast Magnetization Dynamics in spin Hall nano-oscillators layer-stacks with different heavy metals — •Tahereh Sadat Parvini, Jakob Walowski, and Markus Muenzenberg — Institut für Physik, Universität Greifswald, Greifswald, Germany
We employed an all-optical time-resolved magneto-optical Kerr effect (TRMOKE) microscope for an unambiguous determination of oscillation frequency and Gilbert damping of spin Hall nano-oscillators. The structures of the stacks are WTa(5)/Py(7)/Pt(2)/HfOX, W(5)/Py(7)/Pt(2)/HfOX, Py(7)/PtCu(5)/HfOX, and Py(7)/PtCr(5)/HfOX (thicknesses are in nm). The oscillation frequency and effective damping parameters are investigated as a function of the intensity and direction of the external magnetic field, the intensity of the pump, and cap layer thicknesses. Our results show stacks with PtCr and PtCu cap layers have smaller Gilbert damping than stacks with Pt cap layers. This study paves the way for developing ultrafast spintronic devices for data storage and information processing.