News Column

Studies from Chongqing University Describe New Findings in Alloys

June 13, 2014

By a News Reporter-Staff News Editor at Science Letter -- Research findings on Alloys are discussed in a new report. According to news reporting originating in Chongqing, People's Republic of China, by NewsRx journalists, research stated, "An enhancement for magnetoelectric (ME) effects is studied in a three-phase ME architecture consisting of two magnetostrictive Terfenol-D (Tb0.3Dy0.7Fe1.92) plates, a piezoelectric PZT (Pb(Zr,Ti)O-3) plate, and a pair of shape-optimized FeCuNbSiB nanocrystalline alloys. By modifying the conventional shape of the magnetic flux concentrator, the shape-optimized flux concentrator has an improved effective permeability (mu(eff)) due to the shape-induced demagnetizing effect at its end surface."

The news reporters obtained a quote from the research from Chongqing University, "The flux concentrator concentrates and amplifies the external magnetic flux into Terfenol-D plate by means of changing its internal flux concentrating manner. Consequently, more flux lines can be uniformly concentrated into Terfenol-D plates. The effective piezomagnetic coefficients (d(33m)) of Terfenol-D plate and the ME voltage coefficients (alpha(ME)) can be further improved under a lower magnetic bias field. The dynamic magneto-elastic properties and the effective magnetic induction of Terfenol-D are taken into account to derive the enhanced effective ME voltage coefficients (alpha(ME,eff)), the consistency of experimental results and theoretical analyses verifies this enhancement. The experimental results demonstrate that the maximum d33m in our proposed architecture achieves 22.48 nm/A under a bias of 114 Oe. The maximum aME in the bias magnetic range 0-900 Oe reaches 84.73 mV/Oe under the low frequency of 1 kHz, and 2.996 V/Oe under the resonance frequency of 102.3 kHz, respectively. It exhibits a 1.43 times larger piezomagnetic coefficient and a 1.87 times higher ME voltage coefficient under a smaller magnetic bias of 82 Oe than those of a conventional TerfenolD/PZT/Terfenol-D composite."

According to the news reporters, the research concluded: "These shape-induced magnetoelectric behaviors provide the possibility of using this ME architecture in ultra-sensitive magnetic sensors."

For more information on this research see: Enhanced magnetoelectric effects in composite of piezoelectric ceramics, rare-earth iron alloys, and shape-optimized nanocrystalline alloys. Review of Scientific Instruments, 2014;85(3):359-367. Review of Scientific Instruments can be contacted at: Amer Inst Physics, Circulation & Fulfillment Div, 2 Huntington Quadrangle, Ste 1 N O 1, Melville, NY 11747-4501, USA. (American Institute of Physics -; Review of Scientific Instruments -

Our news correspondents report that additional information may be obtained by contacting J.T. Zhang, Chongqing Univ, Coll Optoelect Engn, Res Center Sensors & Instruments, Chongqing 400044, People's Republic of China. Additional authors for this research include P. Li, Y.M. Wen, W. He, A.C. Yang and C.J. Lu (see also Alloys).

Keywords for this news article include: Asia, Alloys, Chongqing, Electronics, Magnetic Flux, Nanotechnology, Nanocrystalline, Emerging Technologies, People's Republic of China

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Source: Science Letter

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