Now showing items 189-208 of 362

    • Magnetic force microscopy investigation of domain structures in Fe-x at. % Ga single crystals (12 < x < 25) 

      Bai, Feiming; Li, Jiefang; Viehland, Dwight D.; Wu, D.; Lograsso, Thomas A. (American Institute of Physics, 2005-07-15)
      The domain structure of furnace-cooled (FC) and post-annealed (PA) Fe-x at. % Ga (x=12, 20, and 25) crystals has been investigated by magnetic force microscopy. For both FC and PA Fe-12 at. % Ga, the domains were found to ...
    • Magnetic force microscopy investigation of the static magnetic domain structure and domain rotation in Fe-x at. %Ga alloys 

      Bai, Feiming; Zhang, H. W.; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2009-10-01)
      Magnetic domain structures and domain rotation process in Fe-x at. %Ga (x=12, 19, and 25) alloys have been studied by magnetic force microscopy. Our results show that the missing connection between magnetic domains and the ...
    • Magnetic Sensing with Ferrofluid and Fiber Optic Connectors 

      Homa, Daniel; Pickrell, Gary (Mdpi Ag, 2014-02-25)
      A simple, cost effective and sensitive fiber optic magnetic sensor fabricated with ferrofluid and commercially available fiber optic components is described in this paper. The system uses a ferrofluid infiltrated extrinsic ...
    • Magnetic-field-induced phase transition in BiFeO3 observed by high-field electron spin resonance: Cycloidal to homogeneous spin order 

      Ruette, B.; Zvyagin, S.; Pyatakov, Alexander P.; Bush, A.; Li, Jiefang; Belotelov, V. I.; Zvezdin, A. K.; Viehland, Dwight D. (American Physical Society, 2004-02-27)
      Bismuth ferrite is a magnetoelectric material, which simultaneously has polarization and spin orders. We have used electron spin resonance (ESR) as a local probe of the magnetic order in the magnetic-field range of 0-25 ...
    • Magnetoelectric and multiferroic properties of variously oriented epitaxial BiFeO3-CoFe2O4 nanostructured thin films 

      Yan, Li; Wang, Zhiguang; Xing, Zengping; Li, Jiefang; Viehland, Dwight D. (American Institute of Physics, 2010-03-15)
      We report the ferroelectric, ferromagnetic, and magnetoelectric (ME) properties of self-assembled epitaxial BiFeO3-CoFe2O4 (BFO-CFO) nanostructure composite thin films deposited on (001), (110), and (111) SrTiO3 (STO) ...
    • Magnetoelectric effect in crystallographically textured BaTiO3 films deposited on ferromagnetic metallic glass foils 

      Wang, Zhiguang; Yan, Li; Yang, Yaodong; Li, Jiefang; Das, Jaydip; Geiler, Anton L.; Yang, Aria F.; Chen, Yajie; Harris, Vincent G.; Viehland, Dwight D. (American Institute of Physics, 2011-02-01)
      We demonstrate a significant control of the polarization response under an applied magnetic field for a magnetoelectric (ME) heterostructure. This structure was comprised of a 2 mu m thick ferroelectric BaTiO3 (BTO) film ...
    • Magnetoelectric effect in sputtered composites 

      Stein, Simon; Wuttig, Manfred; Viehland, Dwight D.; Quandt, Eckhard (American Institute of Physics, 2005-05-15)
      The magnetoelectric effect in millimeter size PMN-PT/Terfenol-D composites is known. In an effort towards miniaturization, we report on the magnetoelectric effect in micrometer-size sputtered composites. Multilayers of ...
    • 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 ...
    • 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, ...
    • Magnetoelectric Interactions in Lead-Based and Lead-Free Composites 

      Bichurin, Mirza I.; Petrov, Vladimir M.; Zakharov, Anatoly; Kovalenko, Denis; Yang, Su Chul; Maurya, Deepam; Bedekar, Vishwas; Priya, Shashank (MDPI, 2011-04-06)
      Magnetoelectric (ME) composites that simultaneously exhibit ferroelectricity and ferromagnetism have recently gained significant attention as evident by the increasing number of publications. These research activities are ...
    • Magnetoelectric nonlinearity in magnetoelectric laminate sensors 

      Shen, Liangguo; Li, Menghui; Gao, Junqi; Shen, Ying; Li, Jiefang; Viehland, Dwight D.; Zhuang, Xin; Sing, M. Lam Chok; Cordier, Christophe; Saez, Sebastien; Dolabdjian, Christophe (American Institute of Physics, 2011-12-01)
      A nonlinearity in the magnetoelectric coefficient, alpha(Nonlin)(ME), of Metglas/Pb(Zr,Ti)O(3) (PZT) and Metglas/Pb(Mg(1/3),Nb(2/3))O(3)-PbTiO(3) (PMN-PT) laminate sensors has been observed. This nonlinearity was found to ...
    • Magnetoelectric properties of core-shell particulate nanocomposites 

      Islam, Rashed A.; Bedekar, Vishwas; Poudyal, Narayan; Liu, J. Ping; Priya, Shashank (American Institute of Physics, 2008-11-15)
      In this study, we report results on magnetoelectric (ME) core-shell Pb(Zr,Ti)O(3) (PZT)-NiFe(2)O(4) (NF) particulate nanocomposites. NF particles forming the shell had size in range of 20-30 nm. The grain size of sintered ...
    • Magnetoelectric properties of flexible BiFeO3/Ni tapes 

      Yan, Li; Zhuo, M.; Wang, Z.; Yao, J.; Haberkorn, N.; Zhang, S.; Civale, L.; Li, J.; Viehland, Dwight D.; Jia, Q. X. (AIP Publishing, 2012-07-01)
      We report ferroelectric (FE), ferromagnetic, and magnetoelectric (ME) properties of BiFeO3 films directly deposited on flexible magnetic Ni tapes. Without use of metal-oxide and/or noble metal buffer layer between the ...
    • Magnetoelectric quasi-(0-3) nanocomposite heterostructures 

      Li, Yanxi; Wang, Zhongchang; Yao, Jianjun; Yang, Tiannan; Wang, Zhiguang; Hu, Jia-Mian; Chen, Chunlin; Sun, Rong; Tian, Zhipeng; Li, Jiefang; Chen, Long-Qing; Viehland, Dwight D. (Nature Publishing Group, 2015-12-01)
      Magnetoelectric composites of magnetic and ferroelectric components are promising for their use in applications such as information storage. Here, the authors find that magnetic quasiparticles embedded in a ferroelectric ...
    • Magnetoelectricity of CoFe2O4 and tetragonal phase BiFeO3 nanocomposites prepared by pulsed laser deposition 

      Gao, Min; Viswan, Ravindranath; Tang, Xiao; Leung, Chung Ming; Li, Jiefang; Viehland, Dwight D. (Springer Nature, 2018-01-10)
      The coupling between the tetragonal phase (T-phase) of BiFeO3 (BFO) and CoFe2O4 (CFO) in magnetoelectric heterostructures has been studied. Bilayers of CFO and BFO were deposited on (001) LaAlO3 single crystal substrates ...
    • 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 ...
    • Materials for the Spine: Anatomy, Problems, and Solutions 

      Frost, Brody A.; Camarero-Espinosa, Sandra; Foster, E. Johan (MDPI, 2019-01-14)
      Disc degeneration affects 12% to 35% of a given population, based on genetics, age, gender, and other environmental factors, and usually occurs in the lumbar spine due to heavier loads and more strenuous motions. Degeneration ...
    • Maximum power of quantum dot laser versus internal loss 

      Asryan, Levon V. (AIP Publishing, 2006-02-01)
      Internal loss, which increases with the carrier density outside the active region, causes a rollover of the light-current curve and strongly limits the output power of a diode laser with a single layer of quantum dots. The ...
    • Maximum power point tracking for solar panels 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Wang, Feng; Wu, Xinke; Wang, Zijian (United States Patent and Trademark Office, 2017-06-20)
      Approximately one-half of the loss of delivered power from a solar panel having photovoltaic (PV) cells connected in series to form sub-panels due to shading is recovered at low hardware cost by connecting sub-panels in ...
    • Measurement Of Dynamic Polarization Modulation Depth Utilizing The J(1)-J(4) Method Of Spectrum Analysis 

      Sudarshanam, V. S.; Desu, Seshu B. (AIP Publishing, 1994-07-01)
      A spectrum analysis method for the linear, direct, and self-consistent measurement of dynamic modulation depth of polarization modulators is presented. This method utilizes the Bessel recurrence relation to determine the ...