Coherent magnetization reversal of a cylindrical nanomagnet in shape-anisotropy magnetic tunnel junctions

Butsurin Jinnai; Junta Igarashi; Kyota Watanabe; Eli Christopher I. Enobio; Shunsuke Fukami; Hideo Ohno

doi:10.1063/5.0043058

Coherent magnetization reversal of a cylindrical nanomagnet in shape-anisotropy magnetic tunnel junctions

Butsurin Jinnai, Junta Igarashi, Kyota Watanabe, Eli Christopher I. Enobio, Shunsuke Fukami, Hideo Ohno

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

1 Citation (Scopus)

Abstract

A shape-anisotropy magnetic tunnel junction (MTJ) holds promise for its scaling into single-digit nanometers while possessing high data-retention capability. Understanding magnetization reversal mode is crucial to quantify the thermal stability factor Δfor data retention with high accuracy. Here, we study magnetization reversal mode in the shape-anisotropy MTJ with a 15-nm-thick CoFeB layer by evaluating Δfrom two different methods: switching probability and retention time measurements. We find that magnetization reversal coherently proceeds in the 15-nm-thick and X/1X-nm-diameter cylindrical nanomagnet in the shape-anisotropy MTJs, in contrast to the conventional interfacial-anisotropy MTJs with a smaller thickness and larger diameter. The coherent magnetization reversal of the shape-anisotropy MTJ is also confirmed by astroid curve measurements. This study provides insight into the development of ultrasmall and high-reliability MTJ devices.

Original language	English
Article number	082404
Journal	Applied Physics Letters
Volume	118
Issue number	8
DOIs	https://doi.org/10.1063/5.0043058
Publication status	Published - 2021 Feb 22

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Coherent magnetization reversal of a cylindrical nanomagnet in shape-anisotropy magnetic tunnel junctions",

abstract = "A shape-anisotropy magnetic tunnel junction (MTJ) holds promise for its scaling into single-digit nanometers while possessing high data-retention capability. Understanding magnetization reversal mode is crucial to quantify the thermal stability factor Δfor data retention with high accuracy. Here, we study magnetization reversal mode in the shape-anisotropy MTJ with a 15-nm-thick CoFeB layer by evaluating Δfrom two different methods: switching probability and retention time measurements. We find that magnetization reversal coherently proceeds in the 15-nm-thick and X/1X-nm-diameter cylindrical nanomagnet in the shape-anisotropy MTJs, in contrast to the conventional interfacial-anisotropy MTJs with a smaller thickness and larger diameter. The coherent magnetization reversal of the shape-anisotropy MTJ is also confirmed by astroid curve measurements. This study provides insight into the development of ultrasmall and high-reliability MTJ devices. ",

author = "Butsurin Jinnai and Junta Igarashi and Kyota Watanabe and Enobio, {Eli Christopher I.} and Shunsuke Fukami and Hideo Ohno",

note = "Funding Information: The authors would like to thank H. Sato, Y. Takeuchi, T. Funatsu, K. Hayakawa, I. Morita, R. Ono, and M. Musya for fruitful discussion and technical support. This work was partly supported by JST-OPERA Grant No. JPMJOP1611; JSPS KAKENHI Grant Nos. JP19J12926 and JP19K04486; Cooperative Research Projects of RIEC, Tohoku University; and DIARE of Tohoku University. J.I. acknowledges financial support from GP-Spin of Tohoku University and JST-OPERA. Publisher Copyright: {\textcopyright} 2021 Author(s).",

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doi = "10.1063/5.0043058",

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AU - Jinnai, Butsurin

AU - Igarashi, Junta

AU - Watanabe, Kyota

AU - Enobio, Eli Christopher I.

AU - Fukami, Shunsuke

AU - Ohno, Hideo

N1 - Funding Information: The authors would like to thank H. Sato, Y. Takeuchi, T. Funatsu, K. Hayakawa, I. Morita, R. Ono, and M. Musya for fruitful discussion and technical support. This work was partly supported by JST-OPERA Grant No. JPMJOP1611; JSPS KAKENHI Grant Nos. JP19J12926 and JP19K04486; Cooperative Research Projects of RIEC, Tohoku University; and DIARE of Tohoku University. J.I. acknowledges financial support from GP-Spin of Tohoku University and JST-OPERA. Publisher Copyright: © 2021 Author(s).

PY - 2021/2/22

Y1 - 2021/2/22

N2 - A shape-anisotropy magnetic tunnel junction (MTJ) holds promise for its scaling into single-digit nanometers while possessing high data-retention capability. Understanding magnetization reversal mode is crucial to quantify the thermal stability factor Δfor data retention with high accuracy. Here, we study magnetization reversal mode in the shape-anisotropy MTJ with a 15-nm-thick CoFeB layer by evaluating Δfrom two different methods: switching probability and retention time measurements. We find that magnetization reversal coherently proceeds in the 15-nm-thick and X/1X-nm-diameter cylindrical nanomagnet in the shape-anisotropy MTJs, in contrast to the conventional interfacial-anisotropy MTJs with a smaller thickness and larger diameter. The coherent magnetization reversal of the shape-anisotropy MTJ is also confirmed by astroid curve measurements. This study provides insight into the development of ultrasmall and high-reliability MTJ devices.

AB - A shape-anisotropy magnetic tunnel junction (MTJ) holds promise for its scaling into single-digit nanometers while possessing high data-retention capability. Understanding magnetization reversal mode is crucial to quantify the thermal stability factor Δfor data retention with high accuracy. Here, we study magnetization reversal mode in the shape-anisotropy MTJ with a 15-nm-thick CoFeB layer by evaluating Δfrom two different methods: switching probability and retention time measurements. We find that magnetization reversal coherently proceeds in the 15-nm-thick and X/1X-nm-diameter cylindrical nanomagnet in the shape-anisotropy MTJs, in contrast to the conventional interfacial-anisotropy MTJs with a smaller thickness and larger diameter. The coherent magnetization reversal of the shape-anisotropy MTJ is also confirmed by astroid curve measurements. This study provides insight into the development of ultrasmall and high-reliability MTJ devices.

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Coherent magnetization reversal of a cylindrical nanomagnet in shape-anisotropy magnetic tunnel junctions

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