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

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

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 sep...

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Veröffentlicht in:Nano letters 2021-12, Vol.21 (24), p.10208-10214
Hauptverfasser: Zhang, Chi, Lee, Inhee, Pu, Yong, Manuilov, Sergei A, Pelekhov, Denis V, Hammel, P. Chris
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container_end_page 10214
container_issue 24
container_start_page 10208
container_title Nano letters
container_volume 21
creator Zhang, Chi
Lee, Inhee
Pu, Yong
Manuilov, Sergei A
Pelekhov, Denis V
Hammel, P. Chris
description 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.
doi_str_mv 10.1021/acs.nanolett.1c03075
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title Spin–Orbit Torque Nano-oscillators by Dipole-Field-Localized Spin Wave Modes
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