Single-spin spectroscopy of spontaneous and phase-locked spin torque oscillator dynamics

• URL: http://arxiv.org/abs/2307.16049v1
• Date: Sat, 29 Jul 2023 18:39:46 GMT
• Title: Single-spin spectroscopy of spontaneous and phase-locked spin torque oscillator dynamics
• Authors: Adrian Solyom, Michael Caouette-Mansour, Brandon Ruffolo, Patrick Braganca, Lilian Childress, and Jack Sankey
• Abstract summary: We employ N-$V$ magnetometry to measure the stray field dynamics of a ferromagnetic permalloy nanowire driven by spin-orbit torques. We observe the optically detected magnetic resonance (ODMR) signatures of both spontaneous DC-driven magnetic oscillations and phase-locking to a second harmonic drive.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We employ N-$V$ magnetometry to measure the stray field dynamics of a ferromagnetic permalloy nanowire driven by spin-orbit torques. Specifically, we observe the optically detected magnetic resonance (ODMR) signatures of both spontaneous DC-driven magnetic oscillations and phase-locking to a second harmonic drive, developing a simple macrospin model that captures the salient features. We also observe signatures of dynamics beyond the macrospin model, including an additional ODMR feature (associated with a second SW mode) and one mode sapping power from another. Our results provide additional insight into N-$V$-spin wave coupling mechanisms, and represent a new modality for sub-wavelength N-$V$ scanned probe microscopy of nanoscale magnetic oscillators.

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