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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, p. 052410-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, p. 052410-
Keywords [en]
Phase-Locking, Nano-Oscillators, Driven, Multilayers, Modulation, Waves
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-143715DOI: 10.1063/1.4864166ISI: 000331644100076Scopus ID: 2-s2.0-84899854008OAI: oai:DiVA.org:kth-143715DiVA, id: diva2:708887
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation
Note

QC 20140331

Available from: 2014-03-31 Created: 2014-03-27 Last updated: 2017-12-05Bibliographically approved

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