scispace - formally typeset
Search or ask a question
Author

Jin Tao

Bio: Jin Tao is an academic researcher from Nanjing Normal University. The author has contributed to research in topics: Permittivity & Helical resonator. The author has an hindex of 1, co-authored 2 publications receiving 4 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, a significant capacitive type magnetoimpedance effect of piezoelectric-magnetostrictive (PM) composite resonator is presented at room temperature.
Abstract: In this article, a significant capacitive type magnetoimpedance effect of piezoelectric-magnetostrictive (PM) composite resonator is presented at room temperature. The variations of relatively effective permittivity of the PM resonator with a dc magnetic field are responsible for the capacitive type magnetoimpedance effect. About 225% and 50% of magnetoimpedance have been achieved at anti-resonance and resonance frequencies of the PM resonator, respectively, which reveals a stronger magnetoelectric coupling at the anti-resonance frequency than that at the resonance frequency of the PM resonator. A detailed analysis also indicates that the magnetocapacitance and magnetoinduction effects of the resonator were originated from the variations of relatively effective permittivity of the resonator. More than 200% and 170% of magnetocapacitance and magnetoinduction were achieved at room temperature in the anti-resonance window, respectively, and also about 150% and 60% of capacitance and induction modulation were observed in the resonance window by applying the dc magnetic fields. The capacitive type magnetoimpedance effect is expected to be used in the design of magnetic-field-tuned ultrasonic transducer.

6 citations

Journal ArticleDOI
TL;DR: In this article, the influence of nonuniform internal stress on magnetoelectric coupling in bonded layered composites of ferromagnet and ferroelectrics was discussed.
Abstract: The influence of nonuniform internal stress on magnetoelectric coupling in bonded layered composites of ferromagnet and ferroelectrics was discussed. The distribution of the inner stress in the ferroelectrics layer under an applied field was studied. A new expression for the magnetoelectric voltage coefficients (MEVC) was obtained through extending Harshe's model, which was derived based on a uniform internal stress in the ferroelectric layer, to the cases with non-uniform internal stresses. The MEVC from the new model is evidently less than that obtained from Harshe's model. According to the new model, one can explain why the observed MEVC values were much less than that calculated from Harshe's model.

1 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, a new class of magnetostatically tunable magnetoimpedance and magneto-capacitance devices based on a composite of ferromagnetic Metglas and ferroelectric lead zirconate titanate (PZT) were studied in a longitudinal inplane magnetic field-transverse electric field (L-T) mode.
Abstract: This report is on a new class of magnetostatically tunable magneto-impedance and magneto-capacitance devices based on a composite of ferromagnetic Metglas and ferroelectric lead zirconate titanate (PZT). Layered magneto-electric (ME) composites with annealed Metglas and PZT were studied in a longitudinal in-plane magnetic field-transverse electric field (L-T) mode. It was found that the degree of tunability was dependent on the annealing temperature of Metglas. An impedance tunability (ΔZ/Z0) of ≥400% was obtained at the electromechanical resonance (EMR) frequency (fr) for a sample with Metglas layers annealed at Ta = 500oC. This tunability is a factor of two higher than for composites with Metglas annealed at 350oC. The tunability of the capacitance, (ΔC/C0), was found to be 290% and -135k% at resonance and antiresonance, respectively, for Ta = 500oC. These results provide clear evidence for improvement in static magnetic field tunability of impedance and capacitance of ME composites with the use of anne...

10 citations

Journal ArticleDOI
TL;DR: In this paper , polycrystalline KBiFe2O5 (KBFO), belonging to the brownmillerite class of monoclinic structure with space group P2/c, is synthesized using a solid-state reaction route.

6 citations

Journal ArticleDOI
TL;DR: A magnetically tunable magnetoelectric transducer vibrator made of ring-type Pb(Zr,Ti)O 3 (PZT)/Terfenol-D (TDF) composite has been developed in this article.
Abstract: A magnetically tunable magnetoelectric transducer vibrator made of ring-type Pb(Zr,Ti)O 3 (PZT)/Terfenol-D (TDF) composite has been developed. We investigated the size effects of the vibrator resonance frequency. The relative effective permittivity and relative effective permeability of magnetoelectric composite are related to the size of ferromagnetic material. Improvements of about 469%, 176% and 696% of magnetoimpedance, magnetoinductance and magnetocapacitance have been achieved at anti-resonance of the vibrator, respectively. The dramatic change in the magnitude of capacitive type magnetoimpedance, magnetoinductance and magnetocapacitance shows that their responses depend on the size of the magnetostrictive ring in the transducer composite vibrator. The capacitive type magnetoimpedance effect can be substantially enhanced via properly designing the inner radius of magnetostrictive ring, which providing an alternative avenue for increasing magnetically tunable sensitivity.

6 citations

Journal ArticleDOI
TL;DR: In this article, a theoretical model for magnetoelectric heterostructures based on the Lorentz magneto-resonator model is presented, which is extremely useful for understanding how magnetolectric materials are working in various applications and how to design new magnetic-electric integrated resonant devices.
Abstract: In the vicinity of their resonance frequency, magnetoelectric heterostructures, which are laminated magnetostrictive material with a piezoelectric resonator, are highly sensitive to external magnetic field. At room temperature colossal magnetodielectric effect near to 30,000% close to the electromechanical resonance frequency was obtained in a magnetic field of about 400 Oe. In this article we present a theoretical model for the magnetoelectric heterostructures based on the Lorentz magneto-resonator model. We show that the colossal magnetodielectric effect is related to the polarization direction of the piezoelectric resonator. When the direction of polarization is parallel to the direction of magnetostriction, the magnetodielectric effect of magnetoelectric heterostructures is much higher than that of the polarization direction perpendicular to the magnetostriction direction. The results of this model are in excellent agreement with experimental data. This modeling environment is found to be extremely useful for understanding how magnetoelectric heterostructures are working in various applications and how to design new magnetic-electric integrated resonant devices.
Journal ArticleDOI
TL;DR: In this paper, the effects of a magnetostrictive layer's material characteristics on the magnetoimpedance of a rectangular magnetoelectric (ME) composite are discussed and experimentally investigated.
Abstract: The rectangular magnetoelectric (ME) composites of Metglas/PZT and Terfenol-D/PZT are prepared, and the effects of a magnetostrictive layer’s material characteristics on the magnetoimpedance of ME composite are discussed and experimentally investigated. The theoretical analyses show that the impedance is not only dependent on Young’s modulus and the magnetostrictive strain of magnetostrictive material but is also influenced by its relative permeability. Compared with Terfenol-D, Metglas possesses significantly higher magnetic permeability and larger magnetostrictive strain at quite low Hdc due to the small saturation field, resulting in the larger magnetoimpedance ratio. The experimental results demonstrate that the maximum magnetoimpedance ratios (i.e., ΔZ/Z) of Metglas/PZT composite are about 605.24% and 239.98% at the antiresonance and resonance, respectively. Specifically, the maximum ΔZ/Z of Metglas/PZT is 8.6 times as high as that of Terfenol-D/PZT at the antiresonance. Such results provide the fundamental guidance in the design and fabrication of novel multifunction devices based on the magnetoimpedance effect of ME composites.