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Parametric excitation in a magnetic tunnel junction-based spin torque oscillator
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
2014 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 104, no 5, 052410- p.Article in journal (Refereed) Published
Abstract [en]

Using microwave current injection at room temperature, we demonstrate parametric excitation of a magnetic tunnel junction (MTJ)-based spin-torque oscillator (STO). Parametric excitation is observed for currents below the auto-oscillation threshold, when the microwave current frequency f(e) is twice the STO free-running frequency f(0). Above threshold, the MTJ becomes parametrically synchronized. In the synchronized state, the STO exhibits an integrated power up to 5 times higher and a linewidth reduction of two orders of magnitude, compared to free-running conditions. We also show that the parametric synchronization favors single mode oscillations in the case of multimode excitation.

Place, publisher, year, edition, pages
2014. Vol. 104, no 5, 052410- p.
Keyword [en]
Phase-Locking, Nano-Oscillators, Driven, Multilayers, Modulation, Waves
National Category
Other Physics Topics
URN: urn:nbn:se:kth:diva-143715DOI: 10.1063/1.4864166ISI: 000331644100076ScopusID: 2-s2.0-84899854008OAI: diva2:708887
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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Material Physics, MF
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