TY - JOUR
T1 - Ferromagnetism and electronic structures of nonstoichiometric Heusler-alloy Fe3-xMnxSi epilayers grown on Ge(111)
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.
PY - 2009/3/30
Y1 - 2009/3/30
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.102.137204
DO - 10.1103/PhysRevLett.102.137204
M3 - Article
AN - SCOPUS:64649105335
VL - 102
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 13
M1 - 137204
ER -