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Modulation-mediated unlocking of a parametrically phase-locked spin torque oscillator
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. University of Gothenburg, Sweden.ORCID iD: 0000-0002-3513-6608
2014 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 105, no 25, 252404- p.Article in journal (Refereed) Published
Abstract [en]

Modulation of an oscillator is crucial for its application in communication devices. While the output power and linewidth of single magnetic tunnel junction-based spin-torque oscillators (MTJ-STO) are not yet adequate for practical uses, the synchronization of such devices can overcome these limitations. Here, we investigate the modulation behavior of a parametrically synchronized MTJ-STO and show experimentally that modulation of the synchronized state preserves synchronization as long as the modulation frequency, integral(mod), is above a characteristic frequency, integral(unlock). The unlocking frequency increases with the modulation amplitude in agreement with analytical estimates and numerical simulations. These phenomena are described as a non-resonant unlocking mechanism, whose characteristics are directly related to inherent parameters of the oscillator.

Place, publisher, year, edition, pages
2014. Vol. 105, no 25, 252404- p.
Keyword [en]
Magnetic Tunnel-Junctions, Polarized Current, Driven, Multilayers, Generation, Emission
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Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-159375DOI: 10.1063/1.4904991ISI: 000346914000016Scopus ID: 2-s2.0-84920158115OAI: oai:DiVA.org:kth-159375DiVA: diva2:785450
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation
Note

QC 20150203

Available from: 2015-02-03 Created: 2015-01-29 Last updated: 2017-12-05Bibliographically approved

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Åkerman, Johan

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