First-Principles Study of Magnetism in Transition Metal Doped Na0.5Bi0.5TiO3 System |
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Authors: | Lin Ju Tong-shuai Xu Yong-jia Zhang Li Sun |
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Institution: | 1.School of Physics and Electric Engineering, Anyang Normal University, Anyang 455000, China2.Department of Physics, Taiyuan University of Technology, Taiyuan 030024, China |
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Abstract: | The origins of magnetism in transition-metal doped Na0.5Bi0.5TiO3 system are investigated by ab initio calculations. The calculated results indicate that a transition-metal atom substitution for a Ti atom produces magnetic moments, which are due to the spin-polarization of transition-metal 3d electrons. The characteristics of exchange coupling are also calculated, which shows that in Cr-/Mn-/Fe-/Co-doped Na0.5Bi0.5TiO3 system, the antiferromagnetic coupling is favorable. The results can successfully explain the experimental phenomenon that, in Mn-/Fe-doped Na0.5Bi0.5TiO3 system, the ferromagnetism disappears at low temperature and the paramagnetic component becomes stronger with the increase of doping concentration of Mn/Fe/Co ions. Unexpectedly, we find the Na0.5Bi0.5Ti0.67V0.33iO3 system with ferromagnetic coupling is favorable and produces a magnetic moment of 2.00 μB, which indicates that low temperature ferromagnetism materials could be made by introducing V atoms in Na0.5Bi0.5TiO3. This may be a new way to produce low temperature multiferroic materials. |
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Keywords: | Transition-metal atom Substitution Magnetic moment First-principles calculation |
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