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Generation linewidth of mode-hopping spin torque oscillators
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 5, 054402- p.Article in journal (Refereed) Published
Abstract [en]

Experiments on spin torque oscillators commonly observe multimode signals. Recent theoretical works have ascribed the multimode signal generation to coupling between energy-separated spin wave modes. Here, we analyze in detail the dynamics generated by such mode coupling. We show analytically that the mode-hopping dynamics broaden the generation linewidth and makes it generally well described by a Voigt line shape. Furthermore, we show that the mode-hopping contribution to the linewidth can dominate, in which case it provides a direct measure of the mode-hopping rate. Due to the thermal drive of mode-hopping events, the mode-hopping rate also provides information on the energy barrier separating modes and temperature-dependent linewidth broadening. Our results are in good agreement with experiments, revealing the physical mechanism behind the linewidth broadening in multimode spin torque oscillators.

Place, publisher, year, edition, pages
2014. Vol. 89, no 5, 054402- p.
Keyword [en]
Magnetic Droplet Solitons, Magnetoresistance, Multilayer, Excitation
National Category
Other Physics Topics
URN: urn:nbn:se:kth:diva-143714DOI: 10.1103/PhysRevB.89.054402ISI: 000332342000001ScopusID: 2-s2.0-84897584214OAI: diva2:709017
Swedish Research CouncilSwedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation

QC 20140331

Available from: 2014-03-31 Created: 2014-03-27 Last updated: 2014-03-31Bibliographically approved

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Åkerman, Johan
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