Time-domain stability of parametric synchronization in a spin-torque nano-oscillator based on a magnetic tunnel junction

Sharma, R. (author)

Sisodia, N. (author)

Dürrenfeld, Philipp (author): Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)

Åkerman, Johan, 1970 (author): KTH,Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Material- och nanofysik,Univ Gothenburg, Sweden

Muduli, P. K. (author)

(creator_code:org_t)

American Physical Society, 2017
2017
English.
In: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 96:2

Related links:: https://gup.ub.gu.se...; show more...; https://doi.org/10.1...; https://urn.kb.se/re...; show less...

Abstract Subject headings

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.

By the author/editor: Sharma, R.; Sisodia, N.; Dürrenfeld, Phil ...; Åkerman, Johan, ...; Muduli, P. K.

About the subject

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