Room temperature multiferroicity in Aurivillius compounds Bi6Fe2?xNixTi3O18 (0≤x≤1) |
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| Affiliation: | 1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People''s Republic of China;2. University of Science and Technology of China, Hefei 230026, People''s Republic of China;3. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, People''s Republic of China;4. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People''s Republic of China;1. College of Physics Science and Key Laboratory of Photonics Materials and Technology in Universities of Shandong, Qingdao University, Qingdao, 266071, China;2. Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters, College of Physical Science and Technology, Yili Normal University, Yining, 835000, China;3. National Laboratory of Solid State Microstructures, Physics School, Nanjing University, Nanjing, 210093, China |
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| Abstract: | We investigate the structural, magnetic, ferroelectric, and dielectric properties of Bi6Fe2?xNixTi3O18 (0≤x≤1). The coexistence of ferroelectricity and ferromagnetism were observed at room temperature for the Ni-doped samples. The ferromagnetism in Bi6Fe2?xNixTi3O18 can be understood in terms of spin canting of the antiferromagnetic coupling of the Fe-based and Ni-based sublattices via Dzyaloshinsky-Moriya interaction. Moreover, the substitution of Ni for Fe was effective for the enhancement of ferroelectric properties. The x=0.6 sample exhibits a maximum remnant polarization Pr of 37.8 μC/cm2 because of a lower leakage current. The rather large activation energy in the x=0 and 0.2 samples implies that the relaxation process may be not associated with the thermal motion of oxygen vacancies inside the bulk. |
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| Keywords: | A Powders: solid state reaction C Ferroelectric properties C magnetic properties |
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