Browsing by Author "Dong, Shuxiang"

Now showing 1 - 20 of 37
  • Thumbnail Image
    An acoustic position sensor
    Dong, Shuxiang; Bai, Feiming; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2003-11-01)
    This article presents an acoustic method-the resonance acoustic field sensor or piezoelectric-sound-resonance cavity (PSRC)-for object position detection. This method utilizes the change of acoustic radiation impedance as a sensing mechanism. The PSRC both generates and detects a resonance acoustic field, along both the axial and transverse directions. We have discovered that an inserted object or an object motion in the sound radiation field results in changes in both the voltage and phase of the PSRC. Results have shown that a minimum object displacement of <10 mum can be detected in the axial direction (and <100 mum in the transverse) by this method. (C) 2003 American Institute of Physics.
  • Thumbnail Image
    Characterization of magnetoelectric laminate composites operated in longitudinal-transverse and transverse-transverse modes
    Dong, Shuxiang; Li, Jiefang; Viehland, Dwight D. (American Institute of Physics, 2004-03-01)
    Magnetostrictive and piezoelectric laminate composites of terfenol-D and Pb(Zr1-xTix)O-3 have been studied. The magnetoelectric (ME) coefficients have been characterized for the different operational modes: (i) a longitudinally magnetized and transversely polarized longitudinal transverse (LT) mode, and (ii) a transversely magnetized and transversely polarized transverse-transverse (TT) mode. The results demonstrate that the (LT) magnetoelectric mode has dramatically higher ME coefficients than the TT one. The LT magnetoelectric coefficient is up to 5-7 times larger than the TT one, when operated in low magnetic bias ranges. (C) 2004 American Institute of Physics.
  • Thumbnail Image
    Circumferential-mode, quasi-ring-type, manetoelectric laminate composite - a highly sensitive electric current and/or vortex magnetic field sensor
    Dong, Shuxiang; Bai, J. G.; Zhai, Junyi; Li, Jiefang; Lu, G. Q.; Viehland, Dwight D.; Zhang, S. J.; Shrout, T. R. (AIP Publishing, 2005-05-01)
    A quasi-ring-type magnetoelectric (ME) laminate composite consisting of a circumferentially poled piezoelectric Pb(Zn1/3Nb2/3O)(3-)4.5 at.% PbTiO(3)single-crystal ring and two circumferentially magnetized magnetostrictive TERFENOL-D rings was fabricated and found to have a giant ME voltage coefficient of 2.2 V/Oe, or equivalently a ME field coefficient of 5.5 V/cm Oe, over the frequency range of 0.5 < f < 10(5) Hz. This circumferential-mode quasiring ME laminate can detect ac currents (noncontact) as small as 10(-7) A, and/or a vortex magnetic field as small as 6 x 10(-12) Tesla. In addition, we demonstrated current sensing capability of the quasiring laminate in a power electronics module. (c) 2005 American Institute of Physics.
  • Thumbnail Image
    Conformal sensor skin approach to the safety-monitoring of H-2 fuel tanks
    Dong, Shuxiang; Cao, Hu; Bai, Feiming; Yan, Li; Li, Jiefang; Viehland, Dwight D.; Gao, Y. K. (AIP Publishing, 2004-05-01)
    A conformal sensor skin approach has been developed for safety monitoring of H-2 fuel tanks. Small piezoelectrically driven sound resonance cavities were embedded in a porous polymer. When placed on a structural composite plate, it was found feasible to detect the leakage of small concentrations of H-2 in real time. (C) 2004 American Institute of Physics.
  • Thumbnail Image
    Correlation between tunability and anisotropy in magnetoelectric voltage tunable inductor (VTI)
    Yan, Yongke; Geng, Liwei D.; Zhang, Lujie; Gao, Xiangyu; Gollapudi, Sreenivasulu; Song, Hyun-Cheol; Dong, Shuxiang; Sanghadasa, Mohan; Ngo, Khai D. T.; Wang, Yu U.; Priya, Shashank (Springer Nature, 2017-11-22)
    Electric field modulation of magnetic properties via magnetoelectric coupling in composite materials is of fundamental and technological importance for realizing tunable energy efficient electronics. Here we provide foundational analysis on magnetoelectric voltage tunable inductor (VTI) that exhibits extremely large inductance tunability of up to 1150% under moderate electric fields. This field dependence of inductance arises from the change of permeability, which correlates with the stress dependence of magnetic anisotropy. Through combination of analytical models that were validated by experimental results, comprehensive understanding of various anisotropies on the tunability of VTI is provided. Results indicate that inclusion of magnetic materials with low magnetocrystalline anisotropy is one of the most effective ways to achieve high VTI tunability. This study opens pathway towards design of tunable circuit components that exhibit field-dependent electronic behavior.
  • Thumbnail Image
    Detection of pico-Tesla magnetic fields using magneto-electric sensors at room temperature
    Zhai, Junyi; Xing, Zengping; Dong, Shuxiang; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2006-02-01)
    The measurement of low-frequency (10(-2)-10(3) Hz) minute magnetic field variations (10(-12) Tesla) at room temperature in a passive mode of operation would be critically enabling for deployable neurological signal interfacing and magnetic anomaly detection applications. However, there is presently no magnetic field sensor capable of meeting all of these requirements. Here, we present new bimorph and push-pull magneto-electric laminate composites, which incorporate a charge compensation mechanism (or bridge) that dramatically enhances noise rejection, enabling achievement of such requirements. (c) 2006 American Institute of Physics.
  • Thumbnail Image
    Enhanced magnetoelectric effect in three-phase MnZnFe2O4/Tb1-xDyxFe2-y/Pb(Zr,Ti)O-3 composites
    Dong, Shuxiang; Zhai, Junyi; Li, Jiefang; Viehland, Dwight D. (American Institute of Physics, 2006-12-15)
    Three-phase magnetoelectric (ME) laminate composites made of high-permeability (mu) MnZnFe2O4, magnetostrictive Tb1-xDyxFe2-y, and piezoelectric Pb(Zr,Ti)O-3 layers and operated in longitudinal magnetization and transverse polarization (L-T) bending modes have been studied. High-mu MnZnFe2O4 layers act as flux concentrators. This results in increased apparent piezomagnetic coefficients in the magnetostrictive Tb1-xDyxFe2-y layer and consequently larger induced voltages across the piezoelectric Pb(Zr,Ti)O-3 layers. We find the enhanced ME field coefficients of up to 8 times for longitudinal magnetization mode, and up to 28 times for transverse magnetization mode, under small dc magnetic field bias. (c) 2006 American Institute of Physics.
  • Thumbnail Image
    Enhanced magnetoelectric effects in laminate composites of Terfenol-D/Pb(Zr,Ti)O-3 under resonant drive
    Dong, Shuxiang; Cheng, J. R.; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2003-12-01)
    We have found that laminate composites consisting of longitudinally magnetized magnetostrictive Terfenol-D and longitudinally poled piezoelectric Pb(Zr,Ti)O-3 layers have dramatically enhanced magnetoelectric effects when driven near resonance. The maximum induced magnetoelectric voltage at resonance was similar to10 Vp/Oe, which is similar to10(2) times higher than previous reports at subresonant frequencies. (C) 2003 American Institute of Physics.
  • Thumbnail Image
    Extremely low frequency response of magnetoelectric multilayer composites
    Dong, Shuxiang; Zhai, Junyi; Xing, Zengping; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2005-03-01)
    A promising generation of extremely low frequency magnetic field sensors, based on multilayer composites (MLCs) of magnetostrictive Terfenol-D, (Tb(1-x)Dy(x)Fe(2-y)) and piezoelectric Pb(Mg(1/3)Nb(2/3))O(3)-PbTiO(3), has been developed. Our MLC magnetoelectric sensor presently shows a limit in (i) working frequency of similar to 5 x 10(-3) Hz; and (ii) magnetic field sensitivity of 10(-7), 10(-9), and 10(-11) T for frequencies of f = 10(-2), 1, and 10(2) Hz, respectively. The results open up possibilities for sensitive low frequency passive magnetic anomaly detection. (c) 2005 American Institute of Physics.
  • Thumbnail Image
    Fe-Ga/Pb(Mg1/3Nb2/3)O-3-PbTiO3 magnetoelectric laminate composites
    Dong, Shuxiang; Zhai, Junyi; Wang, Naigang; Bai, Feiming; Li, Jiefang; Viehland, Dwight D.; Lograsso, Thomas A. (AIP Publishing, 2005-11-01)
    We have found large magnetoelectric (ME) effects in long-type laminate composites of Fe-20% Ga magnetostrictive alloys and piezoelectric Pb(Mg1/3Nb2/3)O-3-PbTiO3 single crystals. At lower frequencies, the ME voltage coefficient of a laminate with longitudinally magnetized and longitudinally polarized (i.e., L-L mode) layers was 1.41 V/Oe (or 1.01 V/cm Oe). Near the natural resonant frequency (similar to 91 kHz) of the laminate, the ME voltage coefficients were found to be dramatically increased to 50.7 V/Oe (36.2 V/cm Oe) for the L-L mode. In addition, the laminate can detect a minute magnetic field as low as similar to 2 x 10(-12) T at resonance frequency, and similar to 1 x 10(-10) T at lower frequencies. (c) 2005 American Institute of Physics.
  • Thumbnail Image
    Geomagnetic sensor based on giant magnetoelectric effect
    Zhai, Junyi; Dong, Shuxiang; Xing, Zengping; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2007-09-01)
    Here, the authors report a new type of geomagnetic field sensor based on the giant magnetoelectric effect in Metglas/piezoelectric-fiber laminates that are wrapped with a coil. These sensors can measure quite precisely the value of both the Earth's magnetic field and its inclination. The geomagnetic field sensor does not require a dc magnetic bias and is driven by a 10 mA ac. Highly sensitive dc magnetic field variations of less than 10(-9) T and angular inclinations of <= 10(-5) deg can be detected, potentially offering opportunities for a small global positioning device. (c) 2007 American Institute of Physics.
  • Thumbnail Image
    Giant magnetoelectric effect (under a dc magnetic bias of 2 Oe) in laminate composites of FeBSiC alloy ribbons and Pb(Zn-1/3,Nb-2/3)O-3-7%PbTiO3 fibers
    Dong, Shuxiang; Zhai, Junyi; Xing, Zengping; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2007-07-01)
    Giant magnetoelectric (ME) voltage and charge coefficients have been found in long-type composites of high-permeability magnetostrictive FeBSiC alloy ribbons laminated together with piezoelectric Pb(Zn-1/3,Nb-2/3)O-3-7%PbTiO3 single crystal fibers. The maximum ME voltage and charge coefficients at low frequencies were 10.5 V/cm Oe and 1 nC/Oe under a notably low dc magnetic bias of 2 Oe; at resonance, these coefficients were dramatically increased to 400 V/cm Oe and 42 nC/Oe, respectively. These values are much higher, and the required dc magnetic bias much lower, than those of previously reported Terfenol-D based ME laminates. (C) 2007 American Institute of Physics.
  • Thumbnail Image
    Giant magnetoelectric effect in Metglas/polyvinylidene-fluoride laminates
    Zhai, Junyi; Dong, Shuxiang; Xing, Zengping; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2006-08-01)
    Here, the authors report thin (< 100 mu m) and flexible magnetoelectric (ME) composites consisting of Metglas (high-mu magnetostriction) and polyvinylidene-fluoride (piezopolymer) layers laminated together. Both unimorph and three-layer configurations have been studied. The authors find that these ME laminates (i) require dc magnetic biases as low as 8 Oe to (ii) induce giant ME voltage coefficients of 7.2 V/cm Oe at low frequencies, and up to 310 V/cm Oe under resonant drive. (c) 2006 American Institute of Physics.
  • Thumbnail Image
    A longitudinal-longitudinal mode TERFENOL-D/Pb(Mg1/3Nb2/3)O-3-PbTiO3 laminate composite
    Dong, Shuxiang; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2004-11-01)
    We have found that laminates of longitudinally magnetized magnetostrictive TERFENOL-D layersand a longitudinally poled piezoelectric Pb(Mg1/3Nb2/3)O-3-PbTiO3 crystal have a giant magnetoelectric voltage coefficient of >430 mV/Oe under a low magnetic bias. Under a resonant drive operation at a frequency of 82.1 kHz, the magnetoelectric coefficient was dramatically increased to similar to18.5 V/Oe. In addition, an ultrahigh magnetic field sensitivity of <10(-11) T has been observed. (C) 2004 American Institute of Physics.
  • Thumbnail Image
    Magnetoelectric effect in Terfenol-D/Pb(Zr,TiO)(3)/mu-metal laminate composites
    Dong, Shuxiang; Zhai, Junyi; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2006-09-01)
    The authors have found that the required dc magnetic bias of magnetoelectric (ME) laminates can be significantly altered, by incorporating additional high-permeability mu-metal layers. Investigations have focused on Tb1-xDyxFe2-y/Pb(Zr1-xTix)O-3/mu-metal laminates. The authors' results show that laminated mu-metal layers oriented perpendicular to an ac magnetic field concentrate flux in the composite, whereas those parallel to it attenuate flux. This results in (i) a significant decrease in the required dc magnetic bias H-dc, and (ii) an effective enhancement in the ME voltage coefficients at low H-dc, by a factor of up to 7.6. (c) 2006 American Institute of Physics.
  • Thumbnail Image
    Magnetoelectric gyration effect in Tb1-xDyxFe2-y/Pb(Zr,Ti)O-3 laminated composites at the electromechanical resonance
    Dong, Shuxiang; Zhai, Junyi; Li, Jiefang; Viehland, Dwight D.; Bichurin, Mirza I. (AIP Publishing, 2006-12-01)
    A giant current-to-voltage (I-V) gyration effect was found in magnetostrictive Tb1-xDyxFe2-y and piezoelectric Pb(Zr,Ti)O-3 laminated composites. An equivalent circuit theory was developed for magnetoelectric gyration, which predicted that I-V conversion is reduced by a frequency transfer function Z(R)(f) and that the maximum occurs at resonance. A giant conversion coefficient up to 2500 V/A was predicted and confirmed. (c) 2006 American Institute of Physics.
  • Thumbnail Image
    Magnetoelectric magnetic field sensor with longitudinally biased magnetostrictive layer
    (United States Patent and Trademark Office, 2006-04-04)
    A magnetoelectric magnetic field sensor has one or more laminated magnetostrictive layers and piezoelectric layers. The magnetostrictive layers are magnetized by a bias magnetic field in a longitudinal, in-plane direction. The piezoelectric layers can be poled in the longitudinal direction or perpendicular direction. The longitudinal magnetization of the magnetostrictive layers provides greatly increased sensitivity at lower bias fields compared to other magnetoelectric sensors. Perpendicular poling of the piezoelectric layers tends to provide higher sensitivity at lower detection frequency (e.g. less than 1 Hz). Longitudinal poling tends to provide higher sensitivity at high detection frequency (e.g. above 10 Hz). Also included are embodiments having relative thicknesses for the magnetostrictive layers that are optimized for sensitivity. Equations are provided for calculating the best relative thickness for the magnetostrictive layer for maximum sensitivity.
  • Thumbnail Image
    Magnetostrictive and magnetoelectric behavior of Fe-20 at. % Ga/Pb(Zr,Ti)O-3 laminates
    Dong, Shuxiang; Zhai, Junyi; Bai, Feiming; Li, Jiefang; Viehland, Dwight D.; Lograsso, Thomas A. (American Institute of Physics, 2005-05-15)
    The magnetostrictive and magnetoelectric (ME) properties of laminate composites of Fe-20 at. % Ga and Pb(Zr,Ti)O-3 (PZT) have been studied for laminates of different geometries. The results show that (i) a long-type magnetostrictive Fe-20 at. % Ga crystal plate oriented along (001), and magnetized in its longitudinal (or length) direction has higher magnetostriction than a disk-type one; and consequently (ii) a long-type Fe-20 at. % Ga/PZT laminate has a giant ME effect, and is sensitive to low-level magnetic fields. (c) 2005 American Institute of Physics.
  • Thumbnail Image
    Method and apparatus for high voltage gain using a magnetostrictive-piezoelectric composite
    (United States Patent and Trademark Office, 2007-08-14)
    A method and apparatus attains high voltage gain by using a composite structure of an elastic section of piezoelectric layers bonded between magnetic and electric sections of magnetostrictive layers, with a harmonic magnetic field being applied along the layers at a mechanical resonance frequency of the composite structure, through coils around the laminate carrying current, such as to produce a continuity of both magnetic and electric flux lines, and achieving a high voltage output.
  • Thumbnail Image
    Method and Apparatus for High-Permeability Magnetostrictive/Piezo-Fiber Laminates Having Colossal, Near-Ideal Magnetoelectricity
    (United States Patent and Trademark Office, 2010-08-10)
    An ME composite laminate of at least one (1-3) piezo-fiber layer coupled with high-permeability alloy magnetostrictive layers, optionally formed of FeBSiC or equivalent. The composite laminate alternates the (1-3) piezo-fiber and high-permeability alloy magnetostrictive layers in a stacked manner. Optionally, the magnetization direction of the high-permeability alloy magnetostrictive layers and polarization direction of the piezo-fiber layer are an (L-L) arrangement. Optionally, thin film polymer layers are between the (1-3) piezo-fiber layer and high-permeability alloy magnetostrictive layers. Optionally, piezo-electric fibers within the (1-3) piezo-fiber layer are poled by inter-digitated electrodes supported by the thin film polymer, arranged as alternating symmetric longitudinally-poled “push-pull” units.