TY - JOUR
T1 - Nanosecond Random Telegraph Noise in In-Plane Magnetic Tunnel Junctions
AU - Hayakawa, K.
AU - Kanai, S.
AU - Funatsu, T.
AU - Igarashi, J.
AU - Jinnai, B.
AU - Borders, W. A.
AU - Ohno, H.
AU - Fukami, S.
N1 - Funding Information:
The authors thank R. Ono, M. Musya, and I. Morita for technical support. This work was supported in part by the JST-CREST No. JPMJCR19K3, JSPS Kakenhi Grants No. 19J12206, No. 19J12926, No. 19K04486, No. 19H05622, No. 20H02178, and No. 19KK0130, and Cooperative Research Projects of RIEC. J. I. acknowledges GP-Spin of Tohoku University, and J. I. and W. A. B. acknowledge JST-OPERA for financial support.
Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/3/17
Y1 - 2021/3/17
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.126.117202
DO - 10.1103/PhysRevLett.126.117202
M3 - Article
C2 - 33798384
AN - SCOPUS:85103080461
SN - 0031-9007
VL - 126
JO - Physical Review Letters
JF - Physical Review Letters
IS - 11
M1 - 117202
ER -