4.8 Article

Spin-Orbit Torque Nano-oscillators by Dipole-Field-Localized Spin Wave Modes

期刊

NANO LETTERS
卷 21, 期 24, 页码 10208-10214

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c03075

关键词

spin-orbit torque; spin-Hall nano-oscillators; dipole-field-localized modes; variable spatial confinement

资金

  1. Center for Emergent Materials, an NSF MRSEC [DMR-2011876]

向作者/读者索取更多资源

The research team demonstrated a high-quality spin-orbit torque nano-oscillator consisting of spin wave modes confined by the strongly inhomogeneous dipole field of a nearby micromagnet. This approach allows for variable spatial confinement and systematic tuning of magnon spectrum and spectral separations to study the impact of multimode interactions on auto-oscillations. The dipole-field-localized spin wave modes exhibit favorable characteristic properties as auto-oscillators, with narrow line width and large amplitude, persisting up to room temperature.
We demonstrate a high-quality spin-orbit torque nano-oscillator comprised of spin wave modes confined by the magnetic field by the strongly inhomogeneous dipole field of a nearby micromagnet. This approach enables variable spatial confinement and systematic tuning of magnon spectrum and spectral separations for studying the impact of multimode interactions on auto-oscillations. We find these dipole-field-localized spin wave modes exhibit good characteristic properties as auto-oscillators-narrow line width and large amplitude-while persisting up to room temperature. We find that the line width of the lowest-lying localized mode is approximately proportional to temperature in good agreement with theoretical analysis of the impact of thermal fluctuations. This demonstration of a clean oscillator with tunable properties provides a powerful tool for understanding the fundamental limitations and line width contributions to improve future spin-Hall oscillators.

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