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Time-domain stabili...
Time-domain stability of parametric synchronization in a spin-torque nano-oscillator based on a magnetic tunnel junction
- Artikel/kapitelEngelska2017
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American Physical Society,2017
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LIBRIS-ID:oai:gup.ub.gu.se/255757
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https://gup.ub.gu.se/publication/255757URI
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https://doi.org/10.1103/PhysRevB.96.024427DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-211602URI
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QC 20170814
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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.
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Sisodia, N.
(författare)
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Dürrenfeld, PhilippGothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
(författare)
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Åkerman, Johan,1970KTH,Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Material- och nanofysik,Univ Gothenburg, Sweden(Swepub:kth)u13m1xx2
(författare)
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Muduli, P. K.
(författare)
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Göteborgs universitetInstitutionen för fysik (GU)
(creator_code:org_t)
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Ingår i:Physical Review B: American Physical Society96:22469-99502469-9969
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