Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions

Tomonori Arakawa; Koji Sekiguchi; Shuji Nakamura; Kensaku Chida; Yoshitaka Nishihara; Daichi Chiba; Kensuke Kobayashi; Akio Fukushima; Shinji Yuasa; Teruo Ono

doi:10.1063/1.3590921

Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions

Tomonori Arakawa, Koji Sekiguchi, Shuji Nakamura, Kensaku Chida, Yoshitaka Nishihara, Daichi Chiba, Kensuke Kobayashi, Akio Fukushima, Shinji Yuasa, Teruo Ono

Department of Physics

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

We measured the shot noise in the CoFeB/MgO/CoFeB-based magnetic tunneling junctions with a high tunneling magnetoresistance ratio (over 200% at 3 K). Although the Fano factor in the antiparallel configuration is close to unity, it is observed to be typically 0.91±0.01 in the parallel configuration. It indicates the sub-Poissonian process of the electron tunneling in the parallel configuration due to the relevance of the spin-dependent coherent transport in the low bias regime.

Original language	English
Article number	202103
Journal	Applied Physics Letters
Volume	98
Issue number	20
DOIs	https://doi.org/10.1063/1.3590921
Publication status	Published - 2011 May 16

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3590921

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Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions. / Arakawa, Tomonori; Sekiguchi, Koji; Nakamura, Shuji; Chida, Kensaku; Nishihara, Yoshitaka; Chiba, Daichi; Kobayashi, Kensuke; Fukushima, Akio; Yuasa, Shinji; Ono, Teruo.

In: Applied Physics Letters, Vol. 98, No. 20, 202103, 16.05.2011.

Research output: Contribution to journal › Article › peer-review

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AU - Arakawa, Tomonori

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AU - Nishihara, Yoshitaka

AU - Chiba, Daichi

AU - Kobayashi, Kensuke

AU - Fukushima, Akio

AU - Yuasa, Shinji

AU - Ono, Teruo

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Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions

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