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Magnetic and Electrical Properties BaTiO₃+MgFe₂O₄ Bulk Composite
Ravindar Tadi(타디 라빈달),Yong-Il Kim(김용일),CheolGi Kim(김철기),Kwon-Sang Ryu(유권상) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Composite materials with coupling between ferromagnetic and ferroelectric orders provides an unique technique of switching electric polarization using magnetic field and magnetic polarization in presence of electric field. BaTiO₃+MgFe₂O₄ material system was synthesized by hybrid chemical process using chlorides and nitrates of barium, titanium, iron, and magnesium. Magnetic properties indicated a soft magnetic behavior for samples annealed at temperatures between 950 to 1150 ℃. Variation of specific saturation magnetization with respect to annealing temperature was related with the distribution of Fe cations among tetrahedral and octahedral sites of MgFe₂O₄. Dielectric constant variation was found to be dependent on applied frequency and annealing temperature for samples annealed from 950 to 1150 ℃.