Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.137204
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology in Japan [18063018]
- Grants-in-Aid for Scientific Research [18063018] Funding Source: KAKEN
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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 L2(1)-ordered structures even for nonstoichiometric atomic compositions. The Curie temperature of the epilayers with x approximate to 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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