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Time-domain stability of parametric synchronization in a spin-torque nano-oscillator based on a magnetic tunnel junction
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Univ Gothenburg, Sweden.ORCID iD: 0000-0002-3513-6608
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 2, article id 024427Article in journal (Refereed) Published
Abstract [en]

We report on time-domain stability of the parametric synchronization in a spin-torque nano-oscillator (STNO) based on a magnetic tunnel junction. Time-domain measurements of the instantaneous frequency (f(i)) of a parametrically synchronized STNO showrandom short-term unlocking of the STNO signal for low injected radio-frequency (RF) power, which cannot be revealed in time-averaged frequency domain measurements. Macrospin simulations reproduce the experimental results and reveal that the random unlocking during synchronization is driven by thermal fluctuations. We show that by using a high injected RF power, random unlocking of the STNO can be avoided. However, a perfect synchronization characterized by complete suppression of phase noise, so-called phase noise squeezing, can be obtained only at a significantly higher RF power. Our macrospin simulations suggest that a lower temperature and a higher positive ratio of the fieldlike torque to the spin transfer torque reduce the threshold RF power required for phase noise squeezing under parametric synchronization.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 96, no 2, article id 024427
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-211602DOI: 10.1103/PhysRevB.96.024427ISI: 000405876300005Scopus ID: 2-s2.0-85026378443OAI: oai:DiVA.org:kth-211602DiVA, id: diva2:1131446
Funder
Swedish Foundation for Strategic Research Swedish Research Council
Note

QC 20170814

Available from: 2017-08-14 Created: 2017-08-14 Last updated: 2017-11-29Bibliographically approved

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Åkerman, Johan

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CiteExportLink to record
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  • apa
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  • nn-NB
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  • Other locale
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Output format
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