We have achieved optical detection of the spin-precession phase in ferromagnetic resonance, which can be used to determine the spin-orbit torque from heavy metals.
Significance and Impact
This technique allows both spatial- and phase-resolved detection of magnetization dynamics with tabletop optical measurements, which enables the characterization of local spin-orbit coupling in quantum materials and complex circuits for coherent spin-information processing.
- A heterodyne detection of the magneto-optical Kerr signal is used for measuring spin-torque driven ferromagnetic resonance.
- Phase and spatial resolutions are demonstrated.
- Extraction of phase delays induced by spin-orbit torque from different heavy metals. Results confirmed by simultaneous electrical detections.
Work was performed in part at the Center for Nanoscale Materials.
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