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Layered magnetic composite magnetic capacitance effects

Author: TangJianGuo
Tutor: WangWei
School: Nanjing Normal University
Course: Condensed Matter Physics
Keywords: Magnetic capacitance effects Magnetic coupling Resonant Frequency Elasticity
CLC: O482.5
Type: Master's thesis
Year: 2011
Downloads: 79
Quote: 0
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Abstract


MCAP (magnetocapacitance, abbreviated as MC) effect, that material under the effect of external magnetic field changes in capacitance or dielectric constant phenomenon. Magnetic probe capacitance effect in a magnetic field , the smart filter , magnetic storage has important application value. For single-phase magnetic material , the magnetic capacitance effect produced mostly in low temperature conditions , making a single -phase material and not get the actual application of technology . Development and research of room temperature magnetic capacitance effects composite materials science to become one of the hot areas of widespread concern . Since the layered composite structure is simple , easy to prepare , magnetostrictive piezoelectric phase mixing between the phases is no mutual dilution , to obtain the desired effect of magnetic capacitor , and thus has a wide range of applications . In this paper, sandwich composite TbxDy1-xFe2_y/Pb (Zr, Ti) O3/TbxDy1-xFe2-y magnetic capacitance effects were studied. The results show : the magnetic - Force - electrically coupling mechanism , the composite material of the bias magnetic field 1600Oe, the resonant frequency of 160.00 kHz 46.15 kHz and generated at a large negative magnetic capacitor , respectively, up to 65 % and 85% , in the non- resonant frequency at the negative magnetic capacitance of only 5%. In addition, the resonant frequency of the composite magnetic field with the operating characteristic of a study and found the composite capacitance increases with frequency have multiple resonant peaks , and the resonance point is the change in the magnetic field shift in the frequency . Theoretically magnetostrictive phase and piezoelectric phase based on the constitutive equations , application elasticity model, the layered composite material capacitance with frequency and magnetic field as a function of the theoretical analysis and simulation . The results show that the resonance frequency of the composite material change in the operating characteristics of the magnetic field from the magnetic soft magnetic phase mutagenesis magnetostriction coefficient .

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Magnetic properties
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