Enhanced room-temperature magnetoelectric coupling effects in c-axis oriented polycrystalline BaSrCo2-xMgxFe11AlO22 |
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| Authors: | Xing-Han Chen Kun Zhai Guo-Yu Qian Qing-Shan Fu Chiranjib Chakrabarti Cang-Long Li Hong-Xia Yin Yang Qiu Zhao-Ming Tian Song-Liu Yuan |
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| Affiliation: | 1. School of Physics, Huazhong University of Science and Technology, Wuhan, P. R. China;2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, P. R. China;3. School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang, P. R. China |
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| Abstract: | The influence of applied magnetic field during annealing process as well as of Mg doping on the room-temperature magnetoelectric coupling effects in BaSrCo2-xMgxFe11AlO22  are experimentally studied through the magnetization, magnetodielectric, and magnetoelectric current measurements. Hexaferrite samples of Co2Y were found to be highly oriented by an applied magnetic field (Ho) during the annealing process, leading to an enhancement of the room-temperature magnetoelectric coupling effects. Although the substitution of nonmagnetic Mg ions in Co sites tends to reduce the ferromagnetism at macroscopic scale, a proper amount of Mg doping content facilitates the superexchange interaction between the adjacent magnetic blocks; meanwhile modulates the magnetic anisotropy in the samples. An appropriate adjustment of the competition between the anisotropy and the superexchange could enhance the magnetoelectric coupling at room temperature, which can be confirmed by the magnetic-field-induced dielectric constant and current density study. |
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| Keywords: | annealing hexaferrite magnetic materials magnetoelectrics orientation |
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