Giant voltage-controlled magnetic anisotropy effect in a crystallographically strained CoFe system

Yushi Kato; Hiroaki Yoda; Yoshiaki Saito; Soichi Oikawa; Keiko Fujii; Masahiko Yoshiki; Katsuhiko Koi; Hideyuki Sugiyama; Mizue Ishikawa; Tomoaki Inokuchi; Naoharu Shimomura; Mariko Shimizu; Satoshi Shirotori; Buyandalai Altansargai; Yuichi Ohsawa; Kazutaka Ikegami; Ajay Tiwari; Atsushi Kurobe

doi:10.7567/APEX.11.053007

Giant voltage-controlled magnetic anisotropy effect in a crystallographically strained CoFe system

Yushi Kato, Hiroaki Yoda, Yoshiaki Saito, Soichi Oikawa, Keiko Fujii, Masahiko Yoshiki, Katsuhiko Koi, Hideyuki Sugiyama, Mizue Ishikawa, Tomoaki Inokuchi, Naoharu Shimomura, Mariko Shimizu, Satoshi Shirotori, Buyandalai Altansargai, Yuichi Ohsawa, Kazutaka Ikegami, Ajay Tiwari, Atsushi Kurobe

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33 Citations (Scopus)

Abstract

We experimentally demonstrate a giant voltage-controlled magnetic anisotropy (VCMA) coefficient in a crystallographically strained CoFe layer (>15 monolayers in thickness) in a MgO/CoFe/Ir system. We observed a strong applied voltage dependence of saturation field and an asymmetric concave behavior with giant VCMA coefficients of %758 and 1043 fJ V%¹ m^%1. The result of structural analysis reveals epitaxial growth in MgO/ CoFe/Ir layers and the orientation relationship MgO(001)[110] k CoFe(001)[100] k Ir(001)[110]. The CoFe layer has a bcc structure and a tetragonal distortion due to the lattice mismatch; therefore, the CoFe layer has a large perpendicular magnetic anisotropy.

Original language	English
Article number	053007
Journal	Applied Physics Express
Volume	11
Issue number	5
DOIs	https://doi.org/10.7567/APEX.11.053007
Publication status	Published - May 2018
Externally published	Yes

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Kato, Y., Yoda, H., Saito, Y., Oikawa, S., Fujii, K., Yoshiki, M., Koi, K., Sugiyama, H., Ishikawa, M., Inokuchi, T., Shimomura, N., Shimizu, M., Shirotori, S., Altansargai, B., Ohsawa, Y., Ikegami, K., Tiwari, A., & Kurobe, A. (2018). Giant voltage-controlled magnetic anisotropy effect in a crystallographically strained CoFe system. Applied Physics Express, 11(5), Article 053007. https://doi.org/10.7567/APEX.11.053007

@article{6ace6c186a704cb7904d9ca77d51bd30,

title = "Giant voltage-controlled magnetic anisotropy effect in a crystallographically strained CoFe system",

abstract = "We experimentally demonstrate a giant voltage-controlled magnetic anisotropy (VCMA) coefficient in a crystallographically strained CoFe layer (>15 monolayers in thickness) in a MgO/CoFe/Ir system. We observed a strong applied voltage dependence of saturation field and an asymmetric concave behavior with giant VCMA coefficients of %758 and 1043 fJ V%1 m%1. The result of structural analysis reveals epitaxial growth in MgO/ CoFe/Ir layers and the orientation relationship MgO(001)[110] k CoFe(001)[100] k Ir(001)[110]. The CoFe layer has a bcc structure and a tetragonal distortion due to the lattice mismatch; therefore, the CoFe layer has a large perpendicular magnetic anisotropy.",

author = "Yushi Kato and Hiroaki Yoda and Yoshiaki Saito and Soichi Oikawa and Keiko Fujii and Masahiko Yoshiki and Katsuhiko Koi and Hideyuki Sugiyama and Mizue Ishikawa and Tomoaki Inokuchi and Naoharu Shimomura and Mariko Shimizu and Satoshi Shirotori and Buyandalai Altansargai and Yuichi Ohsawa and Kazutaka Ikegami and Ajay Tiwari and Atsushi Kurobe",

note = "Publisher Copyright: {\textcopyright} 2018 The Japan Society of Applied Physics.",

year = "2018",

month = may,

doi = "10.7567/APEX.11.053007",

language = "English",

volume = "11",

journal = "Applied Physics Express",

issn = "1882-0778",

publisher = "Japan Society of Applied Physics",

number = "5",

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Kato, Y, Yoda, H, Saito, Y, Oikawa, S, Fujii, K, Yoshiki, M, Koi, K, Sugiyama, H, Ishikawa, M, Inokuchi, T, Shimomura, N, Shimizu, M, Shirotori, S, Altansargai, B, Ohsawa, Y, Ikegami, K, Tiwari, A & Kurobe, A 2018, 'Giant voltage-controlled magnetic anisotropy effect in a crystallographically strained CoFe system', Applied Physics Express, vol. 11, no. 5, 053007. https://doi.org/10.7567/APEX.11.053007

TY - JOUR

T1 - Giant voltage-controlled magnetic anisotropy effect in a crystallographically strained CoFe system

AU - Kato, Yushi

AU - Yoda, Hiroaki

AU - Saito, Yoshiaki

AU - Oikawa, Soichi

AU - Fujii, Keiko

AU - Yoshiki, Masahiko

AU - Koi, Katsuhiko

AU - Sugiyama, Hideyuki

AU - Ishikawa, Mizue

AU - Inokuchi, Tomoaki

AU - Shimomura, Naoharu

AU - Shimizu, Mariko

AU - Shirotori, Satoshi

AU - Altansargai, Buyandalai

AU - Ohsawa, Yuichi

AU - Ikegami, Kazutaka

AU - Tiwari, Ajay

AU - Kurobe, Atsushi

PY - 2018/5

Y1 - 2018/5

N2 - We experimentally demonstrate a giant voltage-controlled magnetic anisotropy (VCMA) coefficient in a crystallographically strained CoFe layer (>15 monolayers in thickness) in a MgO/CoFe/Ir system. We observed a strong applied voltage dependence of saturation field and an asymmetric concave behavior with giant VCMA coefficients of %758 and 1043 fJ V%1 m%1. The result of structural analysis reveals epitaxial growth in MgO/ CoFe/Ir layers and the orientation relationship MgO(001)[110] k CoFe(001)[100] k Ir(001)[110]. The CoFe layer has a bcc structure and a tetragonal distortion due to the lattice mismatch; therefore, the CoFe layer has a large perpendicular magnetic anisotropy.

AB - We experimentally demonstrate a giant voltage-controlled magnetic anisotropy (VCMA) coefficient in a crystallographically strained CoFe layer (>15 monolayers in thickness) in a MgO/CoFe/Ir system. We observed a strong applied voltage dependence of saturation field and an asymmetric concave behavior with giant VCMA coefficients of %758 and 1043 fJ V%1 m%1. The result of structural analysis reveals epitaxial growth in MgO/ CoFe/Ir layers and the orientation relationship MgO(001)[110] k CoFe(001)[100] k Ir(001)[110]. The CoFe layer has a bcc structure and a tetragonal distortion due to the lattice mismatch; therefore, the CoFe layer has a large perpendicular magnetic anisotropy.

UR - http://www.scopus.com/inward/record.url?scp=85046550443&partnerID=8YFLogxK

U2 - 10.7567/APEX.11.053007

DO - 10.7567/APEX.11.053007

M3 - Article

AN - SCOPUS:85046550443

SN - 1882-0778

VL - 11

JO - Applied Physics Express

JF - Applied Physics Express

IS - 5

M1 - 053007

ER -

Giant voltage-controlled magnetic anisotropy effect in a crystallographically strained CoFe system

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