期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.117202
关键词
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资金
- JST-CREST [JPMJCR19K3]
- JSPS Kakenhi [19J12206, 19J12926, 19K04486, 19H05622, 20H02178, 19KK0130]
- Cooperative Research Projects of RIEC
- GP-Spin of Tohoku University
- JST-OPERA
- Grants-in-Aid for Scientific Research [19KK0130, 19J12206, 20H02178, 19J12926, 19K04486] Funding Source: KAKEN
Analyzing and calculating the effects of random telegraph noise on in-plane easy-axis MTJs, it was found that i-MTJs can have faster RTN. Superparamagnetic i-MTJs can achieve relaxation times down to 8 ns without bias current, significantly shorter than typical p-MTJs and faster than any reported i-MTJs to date, providing new insights for developing stochastic MTJs for high-performance probabilistic computers.
We study the timescale of random telegraph noise (RTN) of nanomagnets in stochastic magnetic tunnel junctions (MTJs). From analytical and numerical calculations based on the Landau-Lifshitz-Gilbert and the Fokker-Planck equations, we reveal mechanisms governing the relaxation time of perpendicular easy-axis MTJs (p-MTJs) and in-plane easy-axis MTJs (i-MTJs), showing that i-MTJs can be made to have faster RTN. Superparamagnetic i-MTJs with small in-plane anisotropy and sizable perpendicular effective anisotropy show relaxation times down to 8 ns at negligible bias current, which is more than 5 orders of magnitude shorter than that of typical stochastic p-MTJs and about 100 times faster than the shortest time of i-MTJs reported so far. The findings give a new insight and foundation in developing stochastic MTJs for high-performance probabilistic computers.
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