A multiscale study of ferromagnetism in clustered (Ga,Mn)N

Magnetic interactions in (Ga,Mn)N are studied on the microscopic inter-cluster and intra-cluster scales using first-principles calculations. Ferromagnetic transition temperatures are calculated using Monte Carlo methods. Randomness in Mn substitution is found to reduce Curie temperatures by about 10...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2006-02, Vol.18 (5), p.1561-1567
Main Authors: Hynninen, Teemu, Raebiger, Hannes, von Boehm, Juhani
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Magnetic semiconductors
Nonmetallic ferromagnetic materials
Physics
Studies of specific magnetic materials
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Summary:Magnetic interactions in (Ga,Mn)N are studied on the microscopic inter-cluster and intra-cluster scales using first-principles calculations. Ferromagnetic transition temperatures are calculated using Monte Carlo methods. Randomness in Mn substitution is found to reduce Curie temperatures by about 10-20% from those of the corresponding regular (Ga,Mn)N lattice due to clustering. Nevertheless, high Curie temperatures reaching above room temperature are obtained even for completely random Mn distribution in (Ga,Mn)N for the Mn concentration of x > =13.5%. Increasing clustering is always found to decrease the Curie temperature-especially when tetramer clusters are formed.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/18/5/008