Journal of Electronic Materials

, Volume 45, Issue 7, pp 3300–3306 | Cite as

Strain Manipulated Magnetic Properties in ZnO and GaN Induced by Cation Vacancy

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Abstract

The effects of isotropic strains on the magnetic properties in ZnO and GaN induced by cation vacancies are comparatively investigated by density functional theory calculations. The magnetic moments and the couplings between vacancies in different charged states are calculated as a function of strains. The modulation of strain on the magnetic properties relies on the materials and the charge states of cation vacancies in them. As the occurrence of charge transfer in ZnO:V Zn under compression, the coupling between \(V_{\rm{Zn}}^{0} \) is antiferromagnetic (AFM) and it could be stabilized by strains. Tensions can strengthen the ferromagnetic (FM) coupling between \(V_{\rm{Zn}}^{0} \) but weaken that of \(V_{\rm{Ga}}^{ - } \). The neutral V Ga are always AFM coupling under strains from −6 to +6% and could be stabilized by compressions. The interactions between \(V_{\rm{Ga}}^{ - } \) are always FM with ignorable variations under strains; however, the FM couplings between \(V_{\rm{Ga}}^{2 - } \) could be strengthened by compressions. These varying trends of magnetic coupling under strains are interpreted by the band coupling models. Therefore, strain-engineering provides a route to manipulate and design high Curie temperature ferromagnetism derived and mediated by intrinsic defect for spintronic applications.

Keywords

Strain cation vacancy diluted magnetic semiconductor density functional theory 
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Notes

Acknowledgements

Dr. Yanqin Gai is grateful to Professor Zhenyu Li for helpful discussions. We acknowledge financial supports from the Fundamental Research Funds for the Central Universities under Grant No. 2010LKWL03, the Special Fund for Theoretical Physics under Grant No. 11047130, the National Natural Science Foundation of China under Grant No. 11104345 and the Key Project of Chinese National Programs for Fundamental Research and Development(973 program) under Grant No. 2011CB302003. We are grateful to the Advanced Analysis and Computation Center of CUMT for the award of CPU hours to accomplish this work.

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Copyright information

© The Minerals, Metals & Materials Society 2016

Authors and Affiliations

  1. 1.Department of Physics, School of SciencesChina University of Mining and TechnologyXuzhouChina

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