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Superharmonic injection locking of nanocontact spin-torque vortex oscillators
Univ Exeter, Dept Phys & Astron, Stocker Rd, Exeter EX4 4QL, Devon, England..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. KTH Royal Inst Technol, Sch ICT, Mat & Nano Phys, Electrum 229, S-16440 Kista, Sweden.;NanOsc AB, Electrum 205, S-16440 Kista, Sweden..
Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4SB, Devon, England..
Shahid Beheshti Univ, Dept Phys, GC, Tehran 19839, Iran..
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2016 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 9, 094404Article in journal (Refereed) Published
Abstract [en]

Superharmonic injection locking of single nanocontact (NC) spin-torque vortex oscillators (STVOs) subject to a small microwave current has been explored. Frequency locking was observed up to the fourth harmonic of the STVO fundamental frequency f(0) in microwave magnetoelectronic measurements. The large frequency tunability of the STVO with respect to f(0) allowed the device to be locked to multiple subharmonics of the microwave frequency f(RF), or to the same subharmonic over a wide range of fRF by tuning the dc current. In general, analysis of the locking range, linewidth, and amplitude showed that the locking efficiency decreased as the harmonic number increased, as expected for harmonic synchronization of a nonlinear oscillator. Time-resolved scanning Kerr microscopy (TRSKM) revealed significant differences in the spatial character of the magnetization dynamics of states locked to the fundamental and harmonic frequencies, suggesting significant differences in the vortex core trajectories within the same device. Superharmonic injection locking of a NC-STVO may open up possibilities for devices such as nanoscale frequency dividers, while differences in the core trajectory may allow mutual synchronization to be achieved in multioscillator networks by tuning the spatial character of the dynamics within shared magnetic layers.

Place, publisher, year, edition, pages
2016. Vol. 94, no 9, 094404
National Category
Condensed Matter Physics
URN: urn:nbn:se:uu:diva-304153DOI: 10.1103/PhysRevB.94.094404ISI: 000382718900004OAI: oai:DiVA.org:uu-304153DiVA: diva2:1014944
Swedish Research CouncilSwedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation
Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2016-10-03Bibliographically approved

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Sani, Sohrab R.
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