Effects of Disorder on the Exchange coupling in (Ga,Mn)As Diluted Magnetic Semiconductors
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| Format: | Artículo científico |
| Sprache: | en |
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Sociedade Brasileira de Física
2006
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| _version_ | 1876441661427417088 |
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| author | A. Fazzio |
| author_facet | A. Fazzio |
| contents | Effects of Disorder on the Exchange coupling in (Ga,Mn)As Diluted Magnetic Semiconductors A. Fazzio Antônio J. R. da Silva Raimundo R. dos Santos Luiz E. Oliveira Física, Astronomía y Matemáticas Disorder Exchange coupling Diluted magnetic semiconductors A theoretical study of the effects of disorder on the Mn-Mn exchange interactions for Ga1¡xMnxAs dilutedmagnetic semiconductors is presented. The disorder is intrinsically considered in the calculations, which areperformed using an ab initio total energy density-functional approach, for a 128 atoms supercell, and by consideringa variety of configurations with 2, 3 and 4 Mn atoms. Results are obtained for the effective JMn¡Mnn , fromfirst (n = 1) all the way up to sixth (n = 6) neighbors via a Heisenberg Hamiltonian used to map the magneticexcitations from ab initio total energy calculations. One then obtains a clear dependence in the magnitudes ofthe JMn¡Mnn with the Mn concentration x. Moreover, we show that, in the case of fixed Mn concentration, configurationaldisorder and/or clustering effects lead to large dispersions in the Mn-Mn exchange interactions. Also,calculations for the ground-state total energies for several configurations suggest that a proper consideration ofdisorder is needed when one is interested in treating temperature and annealing effects. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46436504 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3B Vol.36 |
| format | Artículo científico |
| id | redalyc_46436504 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Effects of Disorder on the Exchange coupling in (Ga,Mn)As Diluted Magnetic Semiconductors A. Fazzio Física, Astronomía y Matemáticas Disorder Exchange coupling Diluted magnetic semiconductors Effects of Disorder on the Exchange coupling in (Ga,Mn)As Diluted Magnetic Semiconductors A. Fazzio Antônio J. R. da Silva Raimundo R. dos Santos Luiz E. Oliveira Física, Astronomía y Matemáticas Disorder Exchange coupling Diluted magnetic semiconductors A theoretical study of the effects of disorder on the Mn-Mn exchange interactions for Ga1¡xMnxAs dilutedmagnetic semiconductors is presented. The disorder is intrinsically considered in the calculations, which areperformed using an ab initio total energy density-functional approach, for a 128 atoms supercell, and by consideringa variety of configurations with 2, 3 and 4 Mn atoms. Results are obtained for the effective JMn¡Mnn , fromfirst (n = 1) all the way up to sixth (n = 6) neighbors via a Heisenberg Hamiltonian used to map the magneticexcitations from ab initio total energy calculations. One then obtains a clear dependence in the magnitudes ofthe JMn¡Mnn with the Mn concentration x. Moreover, we show that, in the case of fixed Mn concentration, configurationaldisorder and/or clustering effects lead to large dispersions in the Mn-Mn exchange interactions. Also,calculations for the ground-state total energies for several configurations suggest that a proper consideration ofdisorder is needed when one is interested in treating temperature and annealing effects. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46436504 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3B Vol.36 |
| title | Effects of Disorder on the Exchange coupling in (Ga,Mn)As Diluted Magnetic Semiconductors |
| topic | Física, Astronomía y Matemáticas Disorder Exchange coupling Diluted magnetic semiconductors |
| url | https://www.redalyc.org/articulo.oa?id=46436504 |