Spin-torque oscillation in a magnetic insulator probed by a single-spin sensor
arXiv:1810.07306 · doi:10.1103/PhysRevB.102.024404
Abstract
Coherent, self-sustained oscillation of magnetization in spin-torque oscillators (STOs) is a promising source for on-chip, nanoscale generation of microwave magnetic fields. Such fields could be used for local excitation of spin-wave resonances, control of spin qubits, and studies of paramagnetic resonance. However, local characterization of fields emitted by an STO has remained an outstanding challenge. Here, we use the spin of a single nitrogen-vacancy (NV) defect in diamond to probe the magnetic fields generated by an STO in a microbar of ferromagnetic insulator yttrium-iron-garnet (YIG). 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.
arXiv comment12 pages, 5 figures
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Cited by in corpus (13)
- Quantum sensing and imaging of spin-orbit-torque-driven spin dynamics in noncollinear antiferromagnet Mn3Sn
- Ferromagnetic dynamics detected via one- and two-magnon NV relaxometry
- Sensing Spin Wave Excitations by Spin Defects in Few-Layer Thick Hexagonal Boron Nitride
- Sensing chiral magnetic noise via quantum impurity relaxometry
- Revealing room temperature ferromagnetism in exfoliated FeGeTe flakes with quantum magnetic imaging
- Above-room-temperature ferromagnetism in ultrathin van der Waals magnet
- Towards a quantum interface between spin waves and paramagnetic spin baths
- Probing thermal magnon current mediated by coherent magnon via nitrogen-vacancy centers in diamond
- Dispersionless propagation of ultra-short spin-wave pulses in ultrathin yttrium iron garnet waveguides
- Electric-Field-Induced Coherent Control of Nitrogen Vacancy Centers
- Easy-plane spin Hall oscillator
- Coherent Driving of a Single Nitrogen Vacancy Center by a Resonant Magnetic Tunnel Junction
- Leveraging symmetry for an accurate spin-orbit torques characterization in ferrimagnetic insulators