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Spectral Characteristics of the Microwave Emission by the Spin Hall Nano-Oscillator

R. H. Liu, W. L. Lim, and S. Urazhdin
Phys. Rev. Lett. 110, 147601 – Published 1 April 2013
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Abstract

We utilized microwave spectroscopy to study the magnetization oscillations locally induced in a Permalloy film by a pure spin current, which is generated due to the spin Hall effect in an adjacent Pt layer. The oscillation frequency is lower than the ferromagnetic resonance of Permalloy, indicating that the oscillation forms a self-localized nonpropagating spin-wave soliton. At cryogenic temperatures, the spectral characteristics are remarkably similar to the traditional spin-torque nano-oscillators driven by spin-polarized currents. However, the linewidth of the oscillation increases exponentially with temperature and an additional peak appears in the spectrum below the ferromagnetic resonance, suggesting that the spectral characteristics are determined by interplay between two localized dynamical states.

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  • Received 2 October 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.147601

© 2013 American Physical Society

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Make your Spins Spin

Published 1 April 2013

Combining two spin-dependent effects generates a microwave signal that can be easily read to study the magnetization dynamics in a device with novel geometry.

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Authors & Affiliations

R. H. Liu, W. L. Lim, and S. Urazhdin

  • Department of Physics, Emory University, Atlanta, Georgia 30322, USA

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Issue

Vol. 110, Iss. 14 — 5 April 2013

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