Voltage-controlled magnetic anisotropy in an ultrathin nickel film studied by operando x-ray magnetic circular dichroism spectroscopy

Risa Miyakaze; Shoya Sakamoto; Takeshi Kawabe; Takuya Tsukahara; Yoshinori Kotani; Kentaro Toyoki; Tetsuya Nakamura; Minori Goto; Yoshishige Suzuki; Shinji Miwa

doi:10.1103/PhysRevB.102.014419

Voltage-controlled magnetic anisotropy in an ultrathin nickel film studied by operando x-ray magnetic circular dichroism spectroscopy

Risa Miyakaze, Shoya Sakamoto, Takeshi Kawabe, Takuya Tsukahara, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Minori Goto, Yoshishige Suzuki, Shinji Miwa

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

3 Citations (Scopus)

Abstract

Voltage-controlled magnetic anisotropy (VCMA) in an atomically thin Ni film placed at an epitaxial Fe-MgO interface has been studied. We characterize the VCMA by employing Fe/Ni/MgO-based magnetic tunnel junction. Moreover, we conduct x-ray magnetic circular dichroism (XMCD) spectroscopy around Ni absorption edges under an external voltage application to the tunnel junction device. This operando XMCD spectroscopy demonstrates voltage-induced changes of orbital and effective spin magnetic moments of Ni. As compared with the previous study, where operando XMCD spectroscopy was performed on an atomically thin Co film, we find that the magnitude of the VCMA effect in Ni and Co is proportional to the voltage-induced change of the orbital magnetic moment. This study would lead to a comprehensive understanding of how an electric field affects interfacial magnetism in ferromagnetic metals.

Original language	English
Article number	014419
Journal	Physical Review B
Volume	102
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.102.014419
Publication status	Published - 2020 Jul 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.102.014419

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@article{81ab0e16971a447fb62371eb101bc2df,

title = "Voltage-controlled magnetic anisotropy in an ultrathin nickel film studied by operando x-ray magnetic circular dichroism spectroscopy",

abstract = "Voltage-controlled magnetic anisotropy (VCMA) in an atomically thin Ni film placed at an epitaxial Fe-MgO interface has been studied. We characterize the VCMA by employing Fe/Ni/MgO-based magnetic tunnel junction. Moreover, we conduct x-ray magnetic circular dichroism (XMCD) spectroscopy around Ni absorption edges under an external voltage application to the tunnel junction device. This operando XMCD spectroscopy demonstrates voltage-induced changes of orbital and effective spin magnetic moments of Ni. As compared with the previous study, where operando XMCD spectroscopy was performed on an atomically thin Co film, we find that the magnitude of the VCMA effect in Ni and Co is proportional to the voltage-induced change of the orbital magnetic moment. This study would lead to a comprehensive understanding of how an electric field affects interfacial magnetism in ferromagnetic metals.",

author = "Risa Miyakaze and Shoya Sakamoto and Takeshi Kawabe and Takuya Tsukahara and Yoshinori Kotani and Kentaro Toyoki and Tetsuya Nakamura and Minori Goto and Yoshishige Suzuki and Shinji Miwa",

note = "Funding Information: Part of this work was supported by JSPS KAKENHI (Grants No. JP18H03880 and No. JP20K15158), the Asahi Glass Foundation, ImPACT program, and the Spintronics Research Network of Japan (Spin-RNJ). The XMCD measurements were performed in SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (Proposals No. 2017A1201, No. 2017B1003, and No. 2017B1969). Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

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doi = "10.1103/PhysRevB.102.014419",

language = "English",

volume = "102",

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T1 - Voltage-controlled magnetic anisotropy in an ultrathin nickel film studied by operando x-ray magnetic circular dichroism spectroscopy

AU - Miyakaze, Risa

AU - Sakamoto, Shoya

AU - Kawabe, Takeshi

AU - Tsukahara, Takuya

AU - Kotani, Yoshinori

AU - Toyoki, Kentaro

AU - Nakamura, Tetsuya

AU - Goto, Minori

AU - Suzuki, Yoshishige

AU - Miwa, Shinji

N1 - Funding Information: Part of this work was supported by JSPS KAKENHI (Grants No. JP18H03880 and No. JP20K15158), the Asahi Glass Foundation, ImPACT program, and the Spintronics Research Network of Japan (Spin-RNJ). The XMCD measurements were performed in SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (Proposals No. 2017A1201, No. 2017B1003, and No. 2017B1969). Publisher Copyright: © 2020 American Physical Society.

PY - 2020/7/1

Y1 - 2020/7/1

N2 - Voltage-controlled magnetic anisotropy (VCMA) in an atomically thin Ni film placed at an epitaxial Fe-MgO interface has been studied. We characterize the VCMA by employing Fe/Ni/MgO-based magnetic tunnel junction. Moreover, we conduct x-ray magnetic circular dichroism (XMCD) spectroscopy around Ni absorption edges under an external voltage application to the tunnel junction device. This operando XMCD spectroscopy demonstrates voltage-induced changes of orbital and effective spin magnetic moments of Ni. As compared with the previous study, where operando XMCD spectroscopy was performed on an atomically thin Co film, we find that the magnitude of the VCMA effect in Ni and Co is proportional to the voltage-induced change of the orbital magnetic moment. This study would lead to a comprehensive understanding of how an electric field affects interfacial magnetism in ferromagnetic metals.

AB - Voltage-controlled magnetic anisotropy (VCMA) in an atomically thin Ni film placed at an epitaxial Fe-MgO interface has been studied. We characterize the VCMA by employing Fe/Ni/MgO-based magnetic tunnel junction. Moreover, we conduct x-ray magnetic circular dichroism (XMCD) spectroscopy around Ni absorption edges under an external voltage application to the tunnel junction device. This operando XMCD spectroscopy demonstrates voltage-induced changes of orbital and effective spin magnetic moments of Ni. As compared with the previous study, where operando XMCD spectroscopy was performed on an atomically thin Co film, we find that the magnitude of the VCMA effect in Ni and Co is proportional to the voltage-induced change of the orbital magnetic moment. This study would lead to a comprehensive understanding of how an electric field affects interfacial magnetism in ferromagnetic metals.

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Voltage-controlled magnetic anisotropy in an ultrathin nickel film studied by operando x-ray magnetic circular dichroism spectroscopy

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