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Chen L.,Chongqing University | Chen L.,The Key Laboratory for Optoelectronic Technology and Systems | Li P.,Chongqing University | Li P.,The Key Laboratory for Optoelectronic Technology and Systems | And 2 more authors.
Journal of Magnetics | Year: 2011

The dynamic magnetostriction characteristics of an Fe-based nanocrystalline FeCuNbSiB alloy are investigated as a function of the dc bias magnetic field. The experimental results show that the piezomagnetic coefficient of FeCuNbSiB is about 2.1 times higher than that of Terfenol-D at the low dc magnetic bias Hdc = 46 Oe. Moreover, FeCuNbSiB has a large resonant dynamic strain coefficient at quite low Hdc due to a high mechanical quality factor, which is 3-5 times greater than that of Terfenol-D at the same low Hdc. Based on such magnetostriction characteristics, we fabricate a new type of transducer with FeCuNbSiB/PZT-8/FeCuNbSiB. Its maximum resonant magnetoelectric voltage coefficient achieves ~10 V/Oe. The ME output power reaches 331.8 μW at an optimum load resistance of 7 kΩ under 0.4 Oe ac magnetic field, which is 50 times higher than that of the previous ultrasonic-horn-substrate composite transducer and it decreases the size by nearly 86%. The performance indicate that the FeCuNbSiB/PZT-8/FeCuNbSiB transducer is promising for application in highly efficient magnetoelectric energy conversion. © 2011 Journal of Magnetics. Source


Wen Y.,Chongqing University | Wen Y.,The Key Laboratory for Optoelectronic Technology and Systems | Wang D.,Chongqing University | Wang D.,The Key Laboratory for Optoelectronic Technology and Systems | And 2 more authors.
Journal of Magnetics | Year: 2011

A novel laminate composite of FeCuNbSiB/FeNi /PZT is proposed, where FeCuNbSiB has a permeability of around 100000, which is much larger than that of FeNi. The high-permeability FeCuNbSiB was laminated with piezomagnetic FeNi rather than attached to its ends. It is expected that the effect produced by the high permeability will act on the whole of the piezomagnetic layer. While a FeNi layer was laminated with a FeCuNbSiB layer, the strong demagnetization produced by the latter was expected to be imposed on the FeNi layer as well as the applied fields. The distribution of applied fields was altered by the high-permeability material (both bias and ac field) and the field variation positively contributed to the ME effect in piezomagnetic/piezoelectric composites. Thus the ME voltage coefficient along with the field sensitivity were improved. © 2011 Journal of Magnetics. Source


Li P.,The Key Laboratory for Optoelectronic Technology and Systems | Li P.,Chongqing University | Wen Y.,The Key Laboratory for Optoelectronic Technology and Systems | Wen Y.,Chongqing University | And 4 more authors.
Journal of Magnetics | Year: 2011

This paper proposes a magnetoelectric (ME) composite transducer structure consisting of a magnetostrictive Htype Fe-Ni fork substrate and piezoelectric PZT plates. The fork composite structure has a higher ME voltage coefficient compared to other ME composite structures due to the higher quality (Q) factor. The ME sensitivity of the fork structure reaches 12 V/Oe (i.e., 150 V/cm Oe). The fork composite with two PZT plates electrically connected in series exhibits over 5 times higher ME voltage coefficient than the output of the rectangle structure in the same size. The experiment shows the composite of a Fe-Ni fork substrate and PZT plates has a significantly enhanced ME voltage coefficient and a higher ME sensitivity relative to the prior sandwiched composite laminates. By the use of a lock-in amplifier with 10 nV resolution, this transducer can detect a weak magnetic field of less than 10-12 T. This transducer can also be designed for a magnetoelectr ic energy harvesterdue to its passive high-efficiency ME energy conversion. © 2011 Journal of Magnetics. Source


Wu Z.,Chongqing University | Wu Z.,The Key Laboratory for Optoelectronic Technology and Systems | Wen Y.,Chongqing University | Wen Y.,The Key Laboratory for Optoelectronic Technology and Systems | And 6 more authors.
Journal of Magnetics | Year: 2011

The magnetostrictive material is magnetized in magnetic field and produces a nonuniform demagnetizing field inside and outside it. The demagnetization is decided by the permeability of magnetostrictive material and its size. The magnetoelectric performances are determined by the synthesis of the applied and demagnetizing fields. An analytical model is proposed to predict the magnetoelectric voltage coefficient (MEVC) of magnetostrictive/piezoelectric laminate composite using equivalent circuit method, in which the nonuniform demagnetizing field is taken into account. The theoretical and experimental results indicate that the MEVC is positively connected with the permeability and the piezomagnetic coefficient of magnetostrictive material. To obtain the maximum MEVC, both the permeability and the piezomagnetic coefficient of magnetostrictive material should be taken into account in selecting the suitable magnetostrictive material. © 2011 Journal of Magnetics. Source

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