Ferromagnetism and electronic structures of nonstoichiometric Heusler-alloy Fe3-xMnxSi epilayers grown on Ge(111)

K. Hamaya, H. Itoh, O. Nakatsuka, K. Ueda, Keisuke Yamamoto, Masaru Itakura, T. Taniyama, T. Ono, M. Miyao

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Abstract

For the study of ferromagnetic materials which are compatible with group-IV semiconductor spintronics, we demonstrate control of the ferromagnetic properties of Heusler-alloy Fe3-xMnxSi epitaxially grown on Ge(111) by tuning the Mn composition x. Interestingly, we obtain L21-ordered structures even for nonstoichiometric atomic compositions. The Curie temperature of the epilayers with x 0.6 exceeds 300 K. Theoretical calculations indicate that the electronic structures of the nonstoichiometric Fe3-xMnxSi alloys become half-metallic for 0.75≤x≤1.5. We discuss the possibility of room-temperature ferromagnetic Fe3-xMnxSi/Ge epilayers with high spin polarization.

Original languageEnglish
Article number137204
JournalPhysical Review Letters
Volume102
Issue number13
DOIs
Publication statusPublished - Mar 30 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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