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

研究成果: Article査読

23 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号053902
ジャーナルJournal of Applied Physics
111
5
DOI
出版ステータスPublished - 2012 3月 1
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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