Spin-torque oscillation in a magnetic insulator probed by a single-spin sensor

Journal article (2020)

Authors

H. Zhang Harvard-Smithsonian Center for Astrophysics, Harvard University
M. J.H. Ku Harvard University, University of Maryland, Harvard-Smithsonian Center for Astrophysics
F. Casola Harvard University, Harvard-Smithsonian Center for Astrophysics
C. H.R. Du Harvard University
T. van der Sar Harvard University
M. C. Onbasli Koç University, Massachusetts Institute of Technology
C. A. Ross Massachusetts Institute of Technology
Y Tserkovnyak University of California
A. Yacoby Harvard University
Ronald L. Walsworth Harvard-Smithsonian Center for Astrophysics, Harvard University, University of Maryland
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Published Date

2020

Language

English

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Abstract

We locally probe the magnetic fields generated by a spin-torque oscillator (STO) in a microbar of ferrimagnetic insulator yttrium-iron-garnet using the spin of a single nitrogen-vacancy (NV) center in diamond. The combined spectral resolution and sensitivity of the NV sensor allows us to resolve multiple spin-wave modes and characterize their damping. When damping is decreased sufficiently via spin injection, the modes auto-oscillate, as indicated by a strongly reduced linewidth, a diverging magnetic power spectral density, and synchronization of the STO frequency to an external microwave source. These results open the way for quantitative, nanoscale mapping of the microwave signals generated by STOs, as well as harnessing STOs as local probes of mesoscopic spin systems.