Now showing items 1-10 of 68
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Thermoelectric Performance of Micro/Nano-Structured Bismuth-Antimony-Telluride Bulk from Low Cost Mechanical Alloying
Contributor:Li, Z.; Zhao, G. L.; Zhang, P.; Guo, S.; Tang, Jinke
In this work, micro/nano-structured Bi0.5Sb1.5Te3 bulk thermoelectric materials were synthesized by mechanical alloying from elemental shots of Bi, Sb, and Te. Cold pressing and subsequent heat treatments with hydrogen ...
Magnetoresistance of a (γ-Fe2O3)80Ag20 nanocomposite prepared in reverse micelles
Contributor:Wiemann, Joan A.; Carpenter, Everett E.; Wiggins, Jason; Zhou, Weilie; Tang, Jinke; Li, Sichu; John, Vijay T.; Long, Gary J.; Mohan, Amitabh
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. ...
Extraordinary Hall effect and ferromagnetism in Fe-doped reduced rutile
Contributor:Wang, Zhenjun; Wang, Wendong; Tang, Jinke; Tung, Le Duc; Spinu, Leonard; Zhou, Weilie
Room-temperature ferromagnetism is observed in reduced rutile TiO2-δ by Fe doping. The epitaxial films grown by pulsed-laser deposition are carefully examined by x-ray diffraction, transmission electron microscopy, and ...
Giant negative magnetoresistance of spin polarons in magnetic semiconductors–chromium-doped Ti2O3 thin films
Contributor:Wang, Zhenjun; Hong, Yuanjia; Tang, Jinke; Radu, Cosmin; Chen, Yuxi; Spinu, Leonard; Zhou, Weilie; Tung, Le Duc
Epitaxial Cr-doped Ti2O3 films show giant negative magnetoresistance up to −365% at 2 K. The resistivity of the doped samples follows the behavior expected of spin (magnetic) polarons at low temperature. Namely, ρ=ρ0 exp(T0 ...
Influence of diamagnetic Pb doping on the crystal structure and multiferroic properties of the BiFeO3 perovskite
Contributor:Zhang, Xingquan; Sui, Yu; Wang, Xianjie; Tang, Jinke; Su, Wenhui
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 ...
Room-temperature ferromagnetism in manganese doped reduced rutile titanium dioxide thin films
Contributor:Wang, Zhenjun; Tang, Jinke; Chen, Yuxi; Spinu, Leonard; Zhou, Weilie; Tung, Le Duc
MnxTi12xO2-δ (x50.02–0.12) thin films grown on α-Al2O3 substrates by pulsed-laser deposition have been investigated. X-ray diffraction and transmission electron microscopy results indicate that the films are single phase ...
Amplification of magnetoresistance and Hall effect of Fe3O4–SiO2–Si structure
Contributor:Wang, Xianjie; Sui, Yu; Tang, Jinke; Li, Yao; Zhang, Xingquan; Wang, Cong; Liu, Zhiguo; Su, Wenhui
In this paper, we report the magnetoresistance and the Hall effect in the Fe3O4–SiO2–Si structure. Single phase magnetite films were deposited on n-type silicon substrates using laser molecular beam epitaxy. When the ...
Enhanced spin-dependent tunneling magnetoresistance in magnetite films coated by polystyrene
Contributor:Wang, Wendong; Malkinski, Leszek; Tang, Jinke
Hematite films were deposited by magnetron sputtering. A phase transformation from hematite to magnetite occurred when polystyrene PS coated hematite films were annealed above 200 °C in hydrogen flow. Giant negative ...
Ce-doped EuO : Magnetic properties and the indirect band gap
Contributor:Liu, Pan; Tang, Jinke; Colo´n Santana, Juan A.; Belashchenko, Kirill D.; Dowben, Peter A.
We have prepared and investigated thin films of EuO doped with the rare-earth element cerium. X-ray diffraction, scanning electron microscopy, and energy dispersive x-ray spectroscopy were used to determine the quality of ...
Negative magnetoresistance of γ-Fe2O3 observed in γ-Fe2O3/Ag granular nanocomposites
Contributor:Tang, Jinke; Feng, Li; Wiemann, Joan A.
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 ...