Observation of the magnetization metastable state in a perpendicularly magnetized nanopillar with asymmetric potential landscape

Shuichi Iwakiri; Satoshi Sugimoto; Yasuhiro Niimi; Kensuke Kobayashi; Yukiko K. Takahashi; Shinya Kasai

doi:10.1063/1.5098866

Observation of the magnetization metastable state in a perpendicularly magnetized nanopillar with asymmetric potential landscape

Shuichi Iwakiri, Satoshi Sugimoto, Yasuhiro Niimi, Kensuke Kobayashi, Yukiko K. Takahashi, Shinya Kasai

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

Abstract

The effect of spin torque on magnetization is investigated in an MgO/CoFeB/W perpendicularly magnetized nanopillar with an asymmetric bistable potential landscape. While conventional pulse-current-induced magnetization switching has been implemented, a metastable switched state is observed under direct current (DC). The mean dwell time of the metastable state depends not only on the DC amplitude but also on the current direction. These results suggest that the damping spin Hall torque suppresses the magnetization fluctuation and realizes the metastable state.

Original language	English
Article number	092407
Journal	Applied Physics Letters
Volume	115
Issue number	9
DOIs	https://doi.org/10.1063/1.5098866
Publication status	Published - 2019 Aug 26
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.5098866

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title = "Observation of the magnetization metastable state in a perpendicularly magnetized nanopillar with asymmetric potential landscape",

abstract = "The effect of spin torque on magnetization is investigated in an MgO/CoFeB/W perpendicularly magnetized nanopillar with an asymmetric bistable potential landscape. While conventional pulse-current-induced magnetization switching has been implemented, a metastable switched state is observed under direct current (DC). The mean dwell time of the metastable state depends not only on the DC amplitude but also on the current direction. These results suggest that the damping spin Hall torque suppresses the magnetization fluctuation and realizes the metastable state.",

author = "Shuichi Iwakiri and Satoshi Sugimoto and Yasuhiro Niimi and Kensuke Kobayashi and Takahashi, {Yukiko K.} and Shinya Kasai",

note = "Funding Information: This work was partially supported by JSPS KAKENHI Grant Nos. JP17K18892, JP18J20527, JP19H00656, JP19H05826, JP16H05964, and JP26103002, RIEC, Tohoku University. One of the authors (S.K.) acknowledges M. Takahagi for the technical support. Publisher Copyright: {\textcopyright} 2019 Author(s).",

year = "2019",

month = aug,

day = "26",

doi = "10.1063/1.5098866",

language = "English",

volume = "115",

journal = "Applied Physics Letters",

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T1 - Observation of the magnetization metastable state in a perpendicularly magnetized nanopillar with asymmetric potential landscape

AU - Iwakiri, Shuichi

AU - Sugimoto, Satoshi

AU - Niimi, Yasuhiro

AU - Kobayashi, Kensuke

AU - Takahashi, Yukiko K.

AU - Kasai, Shinya

N1 - Funding Information: This work was partially supported by JSPS KAKENHI Grant Nos. JP17K18892, JP18J20527, JP19H00656, JP19H05826, JP16H05964, and JP26103002, RIEC, Tohoku University. One of the authors (S.K.) acknowledges M. Takahagi for the technical support. Publisher Copyright: © 2019 Author(s).

PY - 2019/8/26

Y1 - 2019/8/26

N2 - The effect of spin torque on magnetization is investigated in an MgO/CoFeB/W perpendicularly magnetized nanopillar with an asymmetric bistable potential landscape. While conventional pulse-current-induced magnetization switching has been implemented, a metastable switched state is observed under direct current (DC). The mean dwell time of the metastable state depends not only on the DC amplitude but also on the current direction. These results suggest that the damping spin Hall torque suppresses the magnetization fluctuation and realizes the metastable state.

AB - The effect of spin torque on magnetization is investigated in an MgO/CoFeB/W perpendicularly magnetized nanopillar with an asymmetric bistable potential landscape. While conventional pulse-current-induced magnetization switching has been implemented, a metastable switched state is observed under direct current (DC). The mean dwell time of the metastable state depends not only on the DC amplitude but also on the current direction. These results suggest that the damping spin Hall torque suppresses the magnetization fluctuation and realizes the metastable state.

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Observation of the magnetization metastable state in a perpendicularly magnetized nanopillar with asymmetric potential landscape

Abstract

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