Observation of room-temperature ferromagnetism in Co-doped Bi0.5K0.5TiO3 materials

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作者：
Le Viet Cuong
Nguyen Hoang Tuan
Dorj Odkhuu
Duong Van Thiet
Nguyen Huu Dung
Luong Huu Bac
Dang Duc Dung
机构：
[1] Ha Noi University of Science and Technology,School of Engineering Physics
[2] University of Engineering and Technology,Faculty of Engineering Physics and Nanotechnology
[3] Vietnam National University,Department of Physics
[4] Incheon National University,Advanced Institute for Science and Technology
[5] Ha Noi University of Science and Technology,undefined
来源：
Applied Physics A | 2017年 / 123卷
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摘要：
We report the band gap modification and strong room ferromagnetism by substituting the Co ions for the Ti site of Bi0.5K0.5TiO3 materials. The predicted band gap of 2.11 eV and magnetic moment of 2.7 μB/Co are reproduced precisely in UV–Vis spectroscopy and superconducting quantum interference device experiments, respectively. We elucidate the driving mechanisms for these results in terms of the spin-exchange splitting between spin subbands in the presence of substitution ions and high-spin crystal field energy spectrum. This method would provide a promising approach to get single-phase multiferroics and resolve the problem of the scarcity of single-phase multiferroics in nature.
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