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Browsing by Author "Finkel, Peter"

Now showing 1 - 5 of 5
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    Enhanced resonant magnetoelectric coupling in frequency-tunable composite multiferroic bimorph structures
    Finkel, Peter; Bonini, J.; Garrity, E.; Bussman, K.; Gao, J.; Li, Jiefang; Lofland, S. E.; Viehland, Dwight D. (AIP Publishing, 2011-02-01)
    We report on a giant tunable enhanced resonant magnetoelectric (ME) coupling in multiferroic magnetostrictive/piezoelectric composite bimorph structures. The approach uses a magnetic/electric field assisted stress-reconfigurable resonance to produce frequency tuning of up to 100%. The studies were performed by laser Doppler spectroscopy. We also show that this principle of a continuously tuned resonance might be used to improve sensitivity for ME magnetic sensors. (C) 2011 American Institute of Physics. [doi:10.1063/1.3560055]
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    Flux distraction effect on magnetoelectric laminate sensors and gradiometer
    Shen, Ying; Gao, Junqi; Wang, Yaojin; Hasanyan, Davresh J.; Finkel, Peter; Li, Jiefang; Viehland, Dwight D. (American Institute of Physics, 2013-10-07)
    A magnetic flux distraction effect caused by a nearby metallic material was investigated for Metglas/Pb(Mg1/3Nb2/3)O-3-PbTiO3 laminated magnetoelectric ( ME) sensors. Using flux distraction, a ME sensor can perform an accurate search for metallic targets of different dimensions at various distances. Detection results and simulations were in good agreement. The findings demonstrate an effective means to employ stationary ME sensors and gradiometers for magnetic search applications. (C) 2013 AIP Publishing LLC.
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    Mechanical loss and magnetoelectric response in magnetostrictive/interdigitated-electrode/piezoelectric laminated resonators
    Wang, Yaojin; Finkel, Peter; Li, Jiefang; Viehland, Dwight D. (American Institute of Physics, 2013-03-28)
    The mechanical quality factor and the resonant magnetoelectric (ME) response of multi-push-pull mode Metglas/interdigitated (ID)-electrode/Pb(Zr,Ti)O-3 (PZT) ME resonators have been studied as a function of ID-electrode geometry for both sandwich and bimorph configurations. The results show that the mechanical quality factor of the PZT core composite and the effective mechanical quality factor of the ME resonator are increased with increasing ID-electrode spacing. The sandwich resonator was found to exhibit a higher effective mechanical quality factor than the bimorph one. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4798300]
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    Piezomagnetic strain-dependent non-linear magnetoelectric response enhancement by flux concentration effect
    Shen, Ying; Gao, Junqi; Wang, Yaojin; Finkel, Peter; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2013-04-01)
    The non-linear magnetoelectric (ME) effect of Metglas/Pb(Mg1/3Nb2/3)O-3-PbTiO3 heterostructures has been studied. Such effect holds promise for modulation mode ME sensor applications that require no dc bias. The non-linear ME coefficient was found to be highly dependent on the derivative of the piezomagnetic strain coefficient, which could be increased by increasing the Metglas length due to magnetic flux concentration. The non-linear ME coefficient was equal to 9.5V/(cm - Oe(2)) at H-dc = -1 Oe and 7.5V/ (cm - Oe(2)) at H-dc = 0Oe for a structure with 10 cm long Metglas foils. (C) 2013 AIP Publishing LLC.
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    Stress reconfigurable tunable magnetoelectric resonators as magnetic sensors
    Kiser, Jillian; Finkel, Peter; Gao, Junqi; Dolabdjian, Christophe; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2013-01-01)
    We report a magnetoelastic effect in doubly clamped ferromagnetic magnetostrictive Metglas resonators with electrically and magnetically reconfigurable frequency response. The field-induced resonance frequency shift is due to magnetostrictive strain, which is shown to have a strong dependence on uniaxial stress. Here, we demonstrate that this magnetic field induced behavior can be used as the basis for a simple, tunable, magnetoelectric magnetic field sensor. The effect of tension on the field dependent magnetostrictive constant and the sensor sensitivity is examined, and the equivalent magnetic noise floor of such a sensor is estimated. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4789500]