Recent Submissions

  • Magnetoresistance of a (γ-Fe2O3)80Ag20 nanocomposite prepared in reverse micelles 

    Author(s):Wiemann, Joan A.; Carpenter, Everett E.; Wiggins, Jason; Zhou, Weilie; Tang, Jinke; Li, Sichu; John, Vijay T.; Long, Gary J.; Mohan, Amitabh; Wiemann, Joan A.; Carpenter, Everett E.; Wiggins, Jason; Zhou, Weilie; Tang, Jinke; Li, Sichu; John, Vijay T.; Long, Gary J.; Mohan, Amitabh
    Date:2000-05-01
    The magnetic and transport properties of a (γ-Fe2O3) 80Ag20 nanocomposite, prepared by a reverse micelle technique, have been studied. γ-Fe2O3 nanoparticles and Ag particles were individually synthesized in reverse micelles. ...
  • Magnetotransport and micro-x-ray absorption near-edge structure studies of glass-coated Fe–Ni–Cu microwires 

    Author(s):Wang, Kai-Ying; Tang, Jinke; Schilling, Paul J.; Moelders, Nicholas; Wang, Kai-Ying; Tang, Jinke; Schilling, Paul J.; Moelders, Nicholas
    Date:2000-05-01
    Magnetotransport and micro-x-ray absorption near-edge structure (micro-XANES) studies of glass-coated 20Fe–20Ni–60Cu microwires have been carried out on both as-cast and heat-treated samples. The micro-XANES spectroscopy ...
  • Amplification of magnetoresistance of magnetite in an Fe3O4–SiO2–Si structure 

    Author(s):Wang, Xianjie; Sui, Yu; Tang, Jinke; Wang, Cong; Zhang, Xingquan; Lu, Zhe; Liu, Zhiguo; Su, Wenhui; Wei, Xiankui; Yu, Richeng; Wang, Xianjie; Sui, Yu; Tang, Jinke; Wang, Cong; Zhang, Xingquan; Lu, Zhe; Liu, Zhiguo; Su, Wenhui; Wei, Xiankui; Yu, Richeng
    Date:2008-01-11
    Film of Fe3O4 was prepared with laser molecular beam epitaxy deposition on a Si substrate with a native SiO2 layer. When the temperature is increased above 250 K, the resistance drops rapidly because the conduction path ...
  • Influence of diamagnetic Pb doping on the crystal structure and multiferroic properties of the BiFeO3 perovskite 

    Author(s):Zhang, Xingquan; Sui, Yu; Wang, Xianjie; Tang, Jinke; Su, Wenhui; Zhang, Xingquan; Sui, Yu; Wang, Xianjie; Tang, Jinke; Su, Wenhui
    Date:2009-04-06
    Structural, magnetic, and electrical properties of Bi1−xPbxFeO3 (x=0, 0.1, 0.2, and 0.3) polycrystalline prepared by solid solution route were studied. The crystal structure data obtained from x-ray diffraction indicate ...
  • Influence of the antiferromagnetic boundary on the magnetic property of La2NiMnO6, The 

    Author(s):Wang, Xianjie; Sui, Yu; Li, Yao; Li, Lu; Zhang, Xingquan; Wang, Yang; Liu, Zhiguo; Su, Wenhui; Tang, Jinke; Wang, Xianjie; Sui, Yu; Li, Yao; Li, Lu; Zhang, Xingquan; Wang, Yang; Liu, Zhiguo; Su, Wenhui; Tang, Jinke
    Date:2009-12-21
    Polycrystalline La2NiMnO6 compounds were fabricated at different temperatures and their magnetic properties were investigated. Although the antiferromagnetic antisite disorder degree changes a little, the antiferromagnetic ...
  • Influence of Fe content on the magnetic and electromagnetic characteristics for Fex(CoNi)1−x ternary alloy nanoparticles, The 

    Author(s):Yan, S. J.; Zhen, L.; Xu, C. Y.; Jiang, J. T.; Shao, W. Z.; Lu, L.; Tang, Jinke; Yan, S. J.; Zhen, L.; Xu, C. Y.; Jiang, J. T.; Shao, W. Z.; Lu, L.; Tang, Jinke
    Date:2011-03-30
    Fex(CoNi)1-x (x=0.14, 0.20, 0.25) ternary alloy nanoparticles were fabricated by a self-catalyzed reduction method at a low temperature. The investigation of static magnetic properties revealed both saturation magnetization ...
  • Effect of Li3N addition by mechanical alloying on Nd2Fe14B—Formation of NdN2, The 

    Author(s):Tang, Jinke; Troupe, J. E.; O'Connor, C. J.; Falster, A. U.; Simmons, W. B.; Tang, Jinke; Troupe, J. E.; O'Connor, C. J.; Falster, A. U.; Simmons, W. B.
    Date:1993-05-15
    Curie temperatures of R2Fe17 and RTiFe11 (R=rare earths) can be raised drastically by addition of interstitial nitrogen. Can one see similar effects in Nd2Fe14B? This question is particularly interesting because Nd2Fe14B's ...
  • Magnetic and magnetotransport properties of intermetallic SmMn2Si2 

    Author(s):Zhao, M.; Sun, C.; Wang, L.; Su, Q.; Zhao, W.; Tang, Jinke; Zhao, M.; Sun, C.; Wang, L.; Su, Q.; Zhao, W.; Tang, Jinke
    Date:1997-04-15
    The magnetic properties of naturally layered intermetallic compound SmMn2Si2 with textured structure have been studied. There exist a ferromagnetic transition at 35 K and two antiferromagnetic transitions at 120 and 230 ...
  • Synthesis and superconductivity of intermetallic compounds Y2NixB8−xC2, YNixCu2−xB2C, and YNixCu2−xSi2C 

    Author(s):Zhao, Wei; Tang, Jinke; Lee, Young-sook; O’Connor, Charles J.; Zhao, Wei; Tang, Jinke; Lee, Young-sook; O’Connor, Charles J.
    Date:1996-04-15
    Borocarbide and silicocarbide intermetallic Y2NixB82xC2 (x = 1, 2, 3, 5), YNiCuB2C, and YNixCu22xSi2C (x = 0, 2) were prepared and their superconductivity was studied. The results indicated that with the change of the ratio ...
  • Magnetoresistance in glass-coated Fe–Ni–Cu microwires 

    Author(s):Wang, K.-Y.; Feng, L.; O’Connor, C. J.; Tang, Jinke; Chen, D.-X.; Vazquez, M.; Hernando, A.; Wang, K.-Y.; Feng, L.; O’Connor, C. J.; Tang, Jinke; Chen, D.-X.; Vazquez, M.; Hernando, A.
    Date:1999-04-15
    Glass-coated Fe–Ni–Cu microwires were prepared by Taylor's technique. X-ray diffraction data show patterns corresponding to fcc Cu. Negative magnetoresistance has been observed, which reaches 8.15% at 77 K and 6.35% at 300 ...
  • Negative magnetoresistance of γ-Fe2O3 observed in γ-Fe2O3/Ag granular nanocomposites 

    Author(s):Tang, Jinke; Feng, Li; Wiemann, Joan A.; Tang, Jinke; Feng, Li; Wiemann, Joan A.
    Date:1999-04-26
    The magnetoresistance of (γ-Fe2O3)xAg100-x (x=50–90), a granular system where insulating magnetic nanoparticles and nonmagnetic metal are intimately mixed, has been studied at room temperature. For high silver concentration ...
  • Thickness dependence of magnetic properties of granular thin films with interacting particles 

    Author(s):Malkinski, Leszek M.; Wang, Jian-Qing; Dai, Jianbiao; Tang, Jinke; O’Connor, Charles J.; Malkinski, Leszek M.; Wang, Jian-Qing; Dai, Jianbiao; Tang, Jinke; O’Connor, Charles J.
    Date:1999-08-09
    The effect of film thickness on magnetic properties of Cu80Co20 granular alloy was studied. It was observed that the susceptibility peak temperature, TM, strongly increases with the film thickness, t, for t<100 nm. The ...
  • Colossal magnetoresistance and magnetic phase transitions in bulk Nd0.7Ba0.3MnO3 

    Author(s):Wang, Kai-Ying; Sangregorio, Claudio; Wiggins, Jason; Wiemann, Joan; Tang, Jinke; Wang, Kai-Ying; Sangregorio, Claudio; Wiggins, Jason; Wiemann, Joan; Tang, Jinke
    Date:2000-05-01
    Perovskite-type Nd0.7Bao0.3MnO3 has been synthesized and its magnetic and magnetotransport properties studied in the temperature range from 5 K to 300 K. X-ray diffraction indicates that the crystal-symmetry is orthorhombic ...
  • Magneto-impedance of glass-coated Fe–Ni–Cu microwires 

    Author(s):Wiggins, J.; Srikanth, H.; Wang, K.-Y.; Spinu, L.; Tang, Jinke; Wiggins, J.; Srikanth, H.; Wang, K.-Y.; Spinu, L.; Tang, Jinke
    Date:2000-05-01
    The magneto-impedance (MI) of glass-coated Fe–Ni–Cu microwires was investigated for longitudinal radio-frequency (rf) currents up to a frequency of 200 MHz using a rf lock-in amplifier method. The MI, defined as ΔZ/Z=[Z(H) ...
  • Magnetic coupling induced increase in the blocking temperature of γ-Fe2O3 nanoparticles 

    Author(s):Dai, Jianbiao; Wang, Jian-Qing; Sangregorio, Claudio; Fang, Jiye; Carpenter, Everett; Tang, Jinke; Dai, Jianbiao; Wang, Jian-Qing; Sangregorio, Claudio; Fang, Jiye; Carpenter, Everett; Tang, Jinke
    Date:2000-05-15
    In this article, we report the magnetic properties of surfactant coated γ-Fe2O3 nanoparticles which are pressed under different pressures. With increasing pressure, the sample volume decreases, density increases, and a 55% ...
  • Direct measurement of the dependence of granular giant magnetoresistance on the relative orientation of magnetic granules 

    Author(s):Dai, Jianbiao; Tang, Jinke; Dai, Jianbiao; Tang, Jinke
    Date:2000-06-26
    Experiments have been designed to vary the relative angle between the magnetic moments of different Co granules in Cu80Co20 granular system. The moments of granules are mostly aligned in the same direction by field cooling ...
  • Characterization of the natural barriers of intergranular tunnel junctions: Cr2O3 surface layers on CrO2 nanoparticles 

    Author(s):Dai, Jianbiao; Tang, Jinke; Xu, Huiping; Spinu, Leonard; Wang, Wendong; Wang, Kaiying; Kumbhar, Amar; Li, Min; Diebold, Ulrike; Dai, Jianbiao; Tang, Jinke; Xu, Huiping; Spinu, Leonard; Wang, Wendong; Wang, Kaiying; Kumbhar, Amar; Li, Min; Diebold, Ulrike
    Date:2000-10-30
    Cold-pressed powder compacts of CrO2 show large negative magnetoresistance (MR) due to intergranular tunneling. Powder compacts made from needle-shaped nanoparticles exhibit MR of about 28% at 5 K. Temperature dependence ...
  • Magnetic properties of nanocrystalline Fe3O4 films 

    Author(s):Tang, Jinke; Wang, Kai-Ying; Zhou, Weilie; Tang, Jinke; Wang, Kai-Ying; Zhou, Weilie
    Date:2001-06-01
    Nanocrystalline magnetite Fe3O4 films of about 180 nm thick have been deposited on Si(100) substrates by pulsed laser deposition. Zero-field-cooled magnetization shows clearly the Verwey transition near 120 K by an abrupt ...
  • Granular growth of Fe3O4 thin films and its antiphase boundaries prepared by pulsed laser deposition 

    Author(s):Zhou, W. L.; Wang, K.-Y.; O'Connor, C. J.; Tang, Jinke; Zhou, W. L.; Wang, K.-Y.; O'Connor, C. J.; Tang, Jinke
    Date:2001-06-01
    Fe3O4 thin film prepared by pulsed laser deposition on Si (100) substrate has been investigated by transmission electron microscopy from plane and cross-sectional views. The thin film, which shows a spinel structure as ...
  • Low field intergranular tunneling effect in CrO2 nanoparticles and characterization of the barriers 

    Author(s):Dai, Jianbiao; Tang, Jinke; Dai, Jianbiao; Tang, Jinke
    Date:2001-06-01
    The magnetoresistance (MR) and microstructures of half-metallic CrO2 nanoparticle systems were studied. Using field alignment, the needle-shaped CrO2 single domain particles were aligned in the same orientation. The MR of ...

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