Magnetic and ferroelectric domain structures in BaTiO3–(Ni0.5Zn0.5)Fe2O4 multiferroic ceramics |
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| Affiliation: | 1. INRS-EMT, University Québec, 1650 Lionel-Boulet, Varennes, Que. J3X 1S2, Canada;2. Department of Solid State & Theor. Physics, Al. I. Cuza University, Bv. Carol I, 11, Iasi 700506, Romania;3. Department of Chemical & Process Eng., University Genoa, P-le Kennedy 1, Genoa I-16129, Italy;4. Institute for Energetics & Interphases-CNR, Via de Marini 6, Genoa I-16149, Italy;5. Physics Department & INFM, University of Genoa, Via Dodecaneso 33, Genoa I-16146, Italy;1. National University of Science and Technology MISiS, 119049, Moscow, Leninsky Prospekt 4, Russia;2. SSPA “Scientific and Practical Materials Research Centre of NAS of Belarus”, 220072, Minsk, P. Brovki Str. 19, Belarus;3. South Ural State University, 454080, Chelyabinsk, Lenin Prospect 76, Russia;4. Physics Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt;1. Materials Chemistry Research Center, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand;2. Department of Chemistry and the Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand;1. Ceramic Composite Laboratory, Centre for Crystal Growth, SAS, VIT University, Vellore 632014, Tamil Nadu, India;2. IFW, Leibniz Institute for Solid State and Materials Research, Technische Universität Dresden, 01069 Dresden, Germany;1. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;2. Chongqing Key Laboratory of Nano/Micro Composite Materials and Devices, Chongqing 401331, China |
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| Abstract: | BaTiO3–(Ni0.5Zn0.5)Fe2O4 composites prepared by co-precipitation were investigated. The macroscopic magnetic properties derived from the magnetic phase (low coercivity, almost no M(H) hysteretic behavior and high permeability) are preserved in the composite. The dielectric properties are strongly influenced by interface phenomena (Maxwell-Wagner), due to the local electrical inhomogeneity. At low frequencies, the composites present thermally activated conductivity and relaxation, while at 1 MHz permittivity of around 500 and tan δ < 8% is obtained at room temperature. The multiferroic character was demonstrated at nanoscale by the presence of the magnetic and ferroelectric domain structure in the same region. Imprint polarisation in the regions corresponding to the ferroelectric phase is found, as result of an internal electrical field created at the interfaces between the (Ni,Zn)-ferrite and BaTiO3 regions. |
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