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MA: Fachverband Magnetismus
MA 18: Magnetic Imaging and Sensors I
MA 18.5: Vortrag
Dienstag, 19. März 2024, 10:30–10:45, EB 301
Mapping magnetic auto-oscillations using a single quantum sensor — •Toni Hache1, Anshu Anshu1, Frank Thiele2, Gunther Richter2, Rainer Stöhr3, Klaus Kern1, 4, Jörg Wrachtrup1, 3, and Aparajita Singha1, 5 — 1Max Planck Institute for Solid State Research, Stuttgart — 2Max Planck Institute for Intelligent Systems, Stuttgart — 33rd Institute of Physics and Research Center SCoPE, University of Stuttgart — 4Institute de Physique, École Polytechnique Fédérale de Lausanne — 5IQST, University of Stuttgart
Magnetic auto-oscillations in nanoscale devices (∼100 nm) have garnered significant interest in recent years as candidates for microwave or spin-wave sources and neurons in neuromorphic computing. They are generated during the interaction of spin currents with the magnetization in ferromagnetic materials via the spin-transfer torque. However, auto-oscillation modes can’t be resolved with widely used laser-scanning methods. Furthermore, without additional effort they can’t be measured with any stroboscopic technique. The mode formation has to be better understood to improve output power and coherence of such devices. Here we demonstrate high resolution spatial mapping of magnetic auto-oscillations with scanning nitrogen-vacancy (NV) center magnetometry. Our measurement relies on the synchronization of the microwave field generated by the auto-oscillation to the NV-spin resonance. The lateral extension of the auto-oscillation modes is obtained by measuring the intensity of the photoluminescence of the NV center which is low wherever the auto-oscillation mode is present.
Keywords: nitrogen-vancancy center; NV magnetometry; spin Hall nano-oscillator; auto-oscillation; spin wave