Experimental study demonstrates single-spin sensing of GHz-frequency spin-torque oscillator dynamics using diamond defects, highlighting new pathways for probing nanoscale magnetic devices.
Nanoscale magnetic circuits provide an alternate paradigm for computation and signal processing, but characterizing the GHz-frequency magnetic dynamics in these systems has been challenging. The authors use the single spin of a nitrogen-vacancy (N-V) center in diamond to probe nanoscale magnetic fields in the GHz regime, identifying signatures of a free-running and phase-locked spin-torque oscillator in the fluorescence spectrum of a proximal N-V, and measure how the dynamics impact the N-V's spin relaxation. This technique could enable new sensing modalities for revealing the nanoscale structure of GHz-frequency dynamics in emerging magnetic nanotechnologies.
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Solyom et al. (2023) studied this question.
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