Effects of disorder on the Curie temperature of GaMnN, GaCrN, InCrN, and InMnN diluted magnetic semiconductors |
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Authors: | A Alsaad IA Qattan |
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Institution: | a Jordan University of Science and Technology, Department of Physical Sciences, P.O. Box, 3030, Irbid 22110, Jordan b Khalifa University of Science, Technology and Research, Department of Physics/General Studies, P.O. Box 573, Sharjah, United Arab Emirates |
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Abstract: | The critical Curie temperatures of ordered and disordered diluted magnetic semiconductors based on GaN, InN, CrN, and MnN compounds are investigated using the classical Heisenberg model within the mean field approximation. The equilibrium structural lattice parameters of all the structures investigated are obtained from first principles. We show that the Curie Tc temperatures of disordered GaN and InN doped with small concentrations of Mn and Cr depends, to a great extent, on the Mn and Cr concentrations. Our calculations on these systems show that a Tc above room-temperature can be observed in these systems and it is affected greatly by the degree of disorder of Mn and Cr randomly distributed on the Ga and In sites. In addition, the ferromagnetic stability in these diluted magnetic semiconductors is studied systematically. Our results indicate that 3d Mn and Cr impurity states in GaN and InN favor the ferromagnetic state rather than the spin-glass phase. |
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Keywords: | Diluted magnetic semiconductors Disorder Curie critical temperature GaN and InN doped with Mn GaN and InN doped with Cr Classical Heisenberg model |
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