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Superharmonic injec...
Superharmonic injection locking of nanocontact spin-torque vortex oscillators
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- Keatley, P. S. (författare)
- Univ Exeter, Dept Phys & Astron, Stocker Rd, Exeter EX4 4QL, Devon, England.
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- Sani, Sohrab R. (författare)
- KTH,Uppsala universitet,Molekyl- och kondenserade materiens fysik,KTH Royal Inst Technol, Sch ICT, Mat & Nano Phys, Electrum 229, S-16440 Kista, Sweden.;NanOsc AB, Electrum 205, S-16440 Kista, Sweden.,Material- och nanofysik
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- Hrkac, G. (författare)
- Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4SB, Devon, England.
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- Mohseni, S. M. (författare)
- Shahid Beheshti Univ, Dept Phys, GC, Tehran 19839, Iran.
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- Dürrenfeld, Philipp (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Univ Gothenburg, Dept Phys, Fysikgrand 3, S-41296 Gothenburg, Sweden.
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- Åkerman, Johan, 1970 (författare)
- KTH,Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),KTH Royal Inst Technol, Sch ICT, Mat & Nano Phys, Electrum 229, S-16440 Kista, Sweden.;NanOsc AB, Electrum 205, S-16440 Kista, Sweden.;Univ Gothenburg, Dept Phys, Fysikgrand 3, S-41296 Gothenburg, Sweden.,Material- och nanofysik
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- Hicken, R. J. (författare)
- Univ Exeter, Dept Phys & Astron, Stocker Rd, Exeter EX4 4QL, Devon, England.
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Univ Exeter, Dept Phys & Astron, Stocker Rd, Exeter EX4 4QL, Devon, England Molekyl- och kondenserade materiens fysik (creator_code:org_t)
- american physical society, 2016
- 2016
- Engelska.
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Ingår i: Physical Review B. - : american physical society. - 2469-9950 .- 2469-9969. ; 94:9
- Relaterad länk:
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- nano-oscillators
- phase-locking
- magnetic multilayer
- polarized current
- driven
- synchronization
- excitation
- dynamics
- devices
- bottom
- Physics
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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