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

Research output: Contribution to journal › Article

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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

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ferromagnetism
electronic structure
ferromagnetic materials
Curie temperature
tuning
room temperature
polarization

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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Ferromagnetism and electronic structures of nonstoichiometric Heusler-alloy Fe3-xMnxSi epilayers grown on Ge(111). / Hamaya, K.; Itoh, H.; Nakatsuka, O.; Ueda, K.; Yamamoto, Keisuke; Itakura, Masaru; Taniyama, T.; Ono, T.; Miyao, M.

In: Physical Review Letters, Vol. 102, No. 13, 137204, 30.03.2009.

Research output: Contribution to journal › Article

Hamaya, K, Itoh, H, Nakatsuka, O, Ueda, K, Yamamoto, K, Itakura, M, Taniyama, T, Ono, T & Miyao, M 2009, 'Ferromagnetism and electronic structures of nonstoichiometric Heusler-alloy Fe3-xMnxSi epilayers grown on Ge(111)', Physical Review Letters, vol. 102, no. 13, 137204. https://doi.org/10.1103/PhysRevLett.102.137204
Hamaya K, Itoh H, Nakatsuka O, Ueda K, Yamamoto K, Itakura M et al. Ferromagnetism and electronic structures of nonstoichiometric Heusler-alloy Fe3-xMnxSi epilayers grown on Ge(111). Physical Review Letters. 2009 Mar 30;102(13). 137204. https://doi.org/10.1103/PhysRevLett.102.137204
Hamaya, K. ; Itoh, H. ; Nakatsuka, O. ; Ueda, K. ; Yamamoto, Keisuke ; Itakura, Masaru ; Taniyama, T. ; Ono, T. ; Miyao, M. / Ferromagnetism and electronic structures of nonstoichiometric Heusler-alloy Fe3-xMnxSi epilayers grown on Ge(111). In: Physical Review Letters. 2009 ; Vol. 102, No. 13.
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AU - Hamaya, K.

AU - Itoh, H.

AU - Nakatsuka, O.

AU - Ueda, K.

AU - Yamamoto, Keisuke

AU - Itakura, Masaru

AU - Taniyama, T.

AU - Ono, T.

AU - Miyao, M.

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