High Curie temperatures in (Ga,Mn)N from Mn clustering

Teemu Hynninen; Hannes Raebiger; Andres Ayuela; J. von Boehm

doi:10.1063/1.2188036

High Curie temperatures in (Ga,Mn)N from Mn clustering

Materials Science 2007-05-23 v2

Authors: Teemu Hynninen , Hannes Raebiger , Andres Ayuela , J. von Boehm

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Abstract

The effect of microscopic Mn cluster distribution on the Curie temperature (Tc) is studied using density-functional calculations. We find that the calculated Tc depends crucially on the microscopic cluster distribution, which can explain the abnormally large variations in experimental Tc values from a few K to well above room temperature. The partially dimerized Mn_2-Mn_1 distribution is found to give the highest Tc > 500 K, and in general, the presence of the Mn_2 dimer has a tendency to enhance Tc. The lowest Tc values close to zero are obtained for the Mn_4-Mn_1 and Mn_4-Mn_3 distributions.

Keywords

GaMnN Curie temperature Mn clustering density-functional calculations ferromagnetism

Cite

@article{arxiv.cond-mat/0508522,
  title  = {High Curie temperatures in (Ga,Mn)N from Mn clustering},
  author = {Teemu Hynninen and Hannes Raebiger and Andres Ayuela and J. von Boehm},
  journal= {arXiv preprint arXiv:cond-mat/0508522},
  year   = {2007}
}

Comments

To appear in Applied Phyiscs Letters

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