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

研究成果査読

21 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 1

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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