Preparation of Co 2FeSn Heusler alloy films and magnetoresistance of Fe/MgO/Co 2FeSn magnetic tunnel junctions

M. A. Tanaka; Y. Ishikawa; Y. Wada; S. Hori; A. Murata; S. Horii; Y. Yamanishi; K. Mibu; K. Kondou; T. Ono; S. Kasai

doi:10.1063/1.3688324

Preparation of Co ₂FeSn Heusler alloy films and magnetoresistance of Fe/MgO/Co ₂FeSn magnetic tunnel junctions

M. A. Tanaka, Y. Ishikawa, Y. Wada, S. Hori, A. Murata, S. Horii, Y. Yamanishi, K. Mibu, K. Kondou, T. Ono, S. Kasai

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

19 Citations (Scopus)

Abstract

To obtain magnetic tunnel junctions (MTJs) composed of non-equilibrium alloy, Co ₂FeSn films were prepared by atomically controlled alternate deposition at various substrate temperatures. X-ray diffraction patterns and Mössbauer spectra clarify that Co ₂FeSn films in the Heusler alloy phase can be realized by growing at a substrate temperature of 250°C or below. Phase separation into cubic CoSn, hexagonal CoSn and cubic CoFe phases occurs in films grown at substrate temperatures 300°C or greater. Fe/MgO/Co ₂FeSn MTJs were prepared with the Co ₂FeSn layer grown at various substrate temperatures. The MTJs with the ferromagnetic Co ₂FeSn layer grown at a substrate temperature of 250 C showed tunnel magnetoresistance ratios of 72.2 and 43.5 at 2 K and 300 K, respectively.

Original language	English
Article number	053902
Journal	Journal of Applied Physics
Volume	111
Issue number	5
DOIs	https://doi.org/10.1063/1.3688324
Publication status	Published - Mar 1 2012
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1063/1.3688324

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Preparation of Co ₂FeSn Heusler alloy films and magnetoresistance of Fe/MgO/Co ₂FeSn magnetic tunnel junctions. / Tanaka, M. A.; Ishikawa, Y.; Wada, Y.; Hori, S.; Murata, A.; Horii, S.; Yamanishi, Y.; Mibu, K.; Kondou, K.; Ono, T.; Kasai, S.

In: Journal of Applied Physics, Vol. 111, No. 5, 053902, 01.03.2012.

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

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title = "Preparation of Co 2FeSn Heusler alloy films and magnetoresistance of Fe/MgO/Co 2FeSn magnetic tunnel junctions",

abstract = "To obtain magnetic tunnel junctions (MTJs) composed of non-equilibrium alloy, Co 2FeSn films were prepared by atomically controlled alternate deposition at various substrate temperatures. X-ray diffraction patterns and M{\"o}ssbauer spectra clarify that Co 2FeSn films in the Heusler alloy phase can be realized by growing at a substrate temperature of 250°C or below. Phase separation into cubic CoSn, hexagonal CoSn and cubic CoFe phases occurs in films grown at substrate temperatures 300°C or greater. Fe/MgO/Co 2FeSn MTJs were prepared with the Co 2FeSn layer grown at various substrate temperatures. The MTJs with the ferromagnetic Co 2FeSn layer grown at a substrate temperature of 250 C showed tunnel magnetoresistance ratios of 72.2 and 43.5 at 2 K and 300 K, respectively.",

author = "Tanaka, {M. A.} and Y. Ishikawa and Y. Wada and S. Hori and A. Murata and S. Horii and Y. Yamanishi and K. Mibu and K. Kondou and T. Ono and S. Kasai",

note = "Funding Information: This work was supported by Grant-in-Aid for Scientific Research in Priority Areas “Creation and Control of Spin Current” from the Ministry of Education, Culture, Sports, Science and Technology of Japan. This work was also supported by Collaborative Research Program of Institute for Chemical Research, Kyoto University (Grant No. 2010-43), Institute of Ceramics Research and Education, Nagoya Institute of Technology and The Nitto Foundation. ",

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AU - Tanaka, M. A.

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AU - Wada, Y.

AU - Hori, S.

AU - Murata, A.

AU - Horii, S.

AU - Yamanishi, Y.

AU - Mibu, K.

AU - Kondou, K.

AU - Ono, T.

AU - Kasai, S.

N1 - Funding Information: This work was supported by Grant-in-Aid for Scientific Research in Priority Areas “Creation and Control of Spin Current” from the Ministry of Education, Culture, Sports, Science and Technology of Japan. This work was also supported by Collaborative Research Program of Institute for Chemical Research, Kyoto University (Grant No. 2010-43), Institute of Ceramics Research and Education, Nagoya Institute of Technology and The Nitto Foundation.

PY - 2012/3/1

Y1 - 2012/3/1

N2 - To obtain magnetic tunnel junctions (MTJs) composed of non-equilibrium alloy, Co 2FeSn films were prepared by atomically controlled alternate deposition at various substrate temperatures. X-ray diffraction patterns and Mössbauer spectra clarify that Co 2FeSn films in the Heusler alloy phase can be realized by growing at a substrate temperature of 250°C or below. Phase separation into cubic CoSn, hexagonal CoSn and cubic CoFe phases occurs in films grown at substrate temperatures 300°C or greater. Fe/MgO/Co 2FeSn MTJs were prepared with the Co 2FeSn layer grown at various substrate temperatures. The MTJs with the ferromagnetic Co 2FeSn layer grown at a substrate temperature of 250 C showed tunnel magnetoresistance ratios of 72.2 and 43.5 at 2 K and 300 K, respectively.

AB - To obtain magnetic tunnel junctions (MTJs) composed of non-equilibrium alloy, Co 2FeSn films were prepared by atomically controlled alternate deposition at various substrate temperatures. X-ray diffraction patterns and Mössbauer spectra clarify that Co 2FeSn films in the Heusler alloy phase can be realized by growing at a substrate temperature of 250°C or below. Phase separation into cubic CoSn, hexagonal CoSn and cubic CoFe phases occurs in films grown at substrate temperatures 300°C or greater. Fe/MgO/Co 2FeSn MTJs were prepared with the Co 2FeSn layer grown at various substrate temperatures. The MTJs with the ferromagnetic Co 2FeSn layer grown at a substrate temperature of 250 C showed tunnel magnetoresistance ratios of 72.2 and 43.5 at 2 K and 300 K, respectively.

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