标题：Sample-size resonance, ferromagnetic resonance and magneto-permittivity resonance in multiferroic nano-BiFeO3/paraffin composites at room temperature
作者：Wang, Lei ;Li, Zhenyu ;Jiang, Jia ;An, Taiyu ;Qin, Hongwei ;Hu, Jifan
作者机构：[Wang, Lei ;Li, Zhenyu ;Jiang, Jia ;An, Taiyu ;Qin, Hongwei ;Hu, Jifan ] School of Physics, State Key Laboratory for Crystal Materials, Shandong Unive 更多
来源：Journal of Magnetism and Magnetic Materials
摘要：In the present work, we demonstrate that ferromagnetic resonance and magneto-permittivity resonance can be observed in appropriate microwave frequencies at room temperature for multiferroic nano-BiFeO3/paraffin composite sample with an appropriate sample-thickness (such as 2 mm). Ferromagnetic resonance originates from the room-temperature weak ferromagnetism of nano-BiFeO3. The observed magneto-permittivity resonance in multiferroic nano-BiFeO3is connected with the dynamic magnetoelectric coupling through Dzyaloshinskii–Moriya (DM) magnetoelectric interaction or the combination of magnetostriction and piezoelectric effects. In addition, we experimentally observed the resonance of negative imaginary permeability for nano BiFeO3/paraffin toroidal samples with longer sample thicknesses D=3.7 and 4.9 mm. Such resonance of negative imaginary permeability belongs to sample-size resonance.