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Title: Mode coupling in spin torque oscillators

Abstract

A number of recent experimental works have shown that the dynamics of a single spin torque oscillator can exhibit complex behavior that stems from interactions between two or more modes of the oscillator, such as observed mode-hopping or mode coexistence. There has been some initial work indicating how the theory for a single-mode (macro-spin) spin torque oscillator should be generalized to include several modes and the interactions between them. In the present work, we rigorously derive such a theory starting with the Landau–Lifshitz–Gilbert equation for magnetization dynamics by expanding up to third-order terms in deviation from equilibrium. Here, our results show how a linear mode coupling, which is necessary for observed mode-hopping to occur, arises through coupling to a magnon bath. In conclusion, the acquired temperature dependence of this coupling implies that the manifold of orbits and fixed points may shift with temperature.

Authors:
 [1];  [2];  [3];  [4]
  1. Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
  2. Univ. of Hong Kong (China). Dept. of Physics; Univ. of Hong Kong (China). Center of Theoretical and Computational Physics
  3. Hong Kong Baptist Univ., Hong Kong (China). Centre for Nonlinear Studies, and Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems, Dept. of Physics
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Material Science Division; Northwestern-Argonne Inst. of Science and Technology, Evanston, IL (United States); Univ. of Chicago, IL (United States). Computation Inst.
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1336254
Alternate Identifier(s):
OSTI ID: 1359364
Grant/Contract Number:
AC02-06CH11357; DMR-1406568; HKU 17210014
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Magnetism and Magnetic Materials
Additional Journal Information:
Journal Volume: 414; Journal Issue: C; Journal ID: ISSN 0304-8853
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; spin-torque oscillator

Citation Formats

Zhang, Steven S. -L., Zhou, Yan, Li, Dong, and Heinonen, Olle. Mode coupling in spin torque oscillators. United States: N. p., 2016. Web. doi:10.1016/j.jmmm.2016.04.041.
Zhang, Steven S. -L., Zhou, Yan, Li, Dong, & Heinonen, Olle. Mode coupling in spin torque oscillators. United States. doi:10.1016/j.jmmm.2016.04.041.
Zhang, Steven S. -L., Zhou, Yan, Li, Dong, and Heinonen, Olle. Thu . "Mode coupling in spin torque oscillators". United States. doi:10.1016/j.jmmm.2016.04.041. https://www.osti.gov/servlets/purl/1336254.
@article{osti_1336254,
title = {Mode coupling in spin torque oscillators},
author = {Zhang, Steven S. -L. and Zhou, Yan and Li, Dong and Heinonen, Olle},
abstractNote = {A number of recent experimental works have shown that the dynamics of a single spin torque oscillator can exhibit complex behavior that stems from interactions between two or more modes of the oscillator, such as observed mode-hopping or mode coexistence. There has been some initial work indicating how the theory for a single-mode (macro-spin) spin torque oscillator should be generalized to include several modes and the interactions between them. In the present work, we rigorously derive such a theory starting with the Landau–Lifshitz–Gilbert equation for magnetization dynamics by expanding up to third-order terms in deviation from equilibrium. Here, our results show how a linear mode coupling, which is necessary for observed mode-hopping to occur, arises through coupling to a magnon bath. In conclusion, the acquired temperature dependence of this coupling implies that the manifold of orbits and fixed points may shift with temperature.},
doi = {10.1016/j.jmmm.2016.04.041},
journal = {Journal of Magnetism and Magnetic Materials},
number = C,
volume = 414,
place = {United States},
year = {Thu Sep 15 00:00:00 EDT 2016},
month = {Thu Sep 15 00:00:00 EDT 2016}
}

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Cited by: 3works
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