Now showing items 1-10 of 65
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Magnetic interaction reversal in watermelon nanostructured Cr-doped Fe nanoclusters
Contributor:Kaur, Maninder; Dai, Qilin; Bowden, Mark; Engelhard, Mark; Wu, Yaqiao; Tang, Jinke; Qiang, You
Cr-doped core-shell Fe/Fe-oxide nanoclusters (NCs) were synthesized at varied atomic percentages of Cr from 0 at.% to 8 at.%. The low concentrations of Cr (<10 at.%) were selected in order to inhibit the complete conversion ...
Pulsed laser deposition of Mn doped CdSe quantum dots for improved solar cell performance
Contributor:Dai, Qilin; Sabio, E. M.; Wang, Wenyong; Tang, Jinke
In this work, we demonstrate (1) a facile method to prepare Mn doped CdSe quantum dots (QDs) on Zn2SnO4 photoanodes by pulsed laser deposition and (2) improved device performance of quantum dot sensitized solar cells of ...
Characterization of the natural barriers of intergranular tunnel junctions : Cr2O3 surface layers on CrO2 nanoparticles
Contributor:Dai, Jianbiao; Tang, Jinke; Xu, Huiping; Spinu, Leonard; Wang, Wendong; Wang, Kaiying; Kumbhar, Amar; Li, Min; Diebold, Ulrike
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 ...
Influence of hot pressure on the magnetoresistance of CrO2
Contributor:Wang, Xianjie; Sui, Yu; Song, Xiudan; Zhu, Ruibin; Qian, Zhengnan; Su, Wenhui; Tang, Jinke
In this paper, we investigate the influence of high temperature and high pressure hot pressure on the magnetic and transport properties of polycrystalline CrO2 samples compacted under high pressure and high temperature of ...
Ferromagnetism in chromium-doped reduced-rutile titanium dioxide thin films
Contributor:Wang, Zhenjun; Tang, Jinke; Zhang, Hongguo; Golub, Vladimir; Spinu, Leonard; Tung, Le Duc
Cr-doped reduced-rutile TiO2 thin films were grown on R-plane sapphire substrates by pulsed-laser deposition. X-ray diffraction and transmission electron microscopy results indicate that the films are single phase and ...
Magnetic properties of nanocrystalline Fe3O4 films
Contributor:Tang, Jinke; Wang, Kai-Ying; Zhou, Weilie
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 ...
Structure and magnetic properties of pure and Gd-doped HfO2 thin films
Contributor:Wang, Wendong; Hong, Yuanjia; Yu, Minghui; Rout, Bibhudutta; Glass, Gary A.; Tang, Jinke
Pure HfO2 and Gd-doped HfO2 thin films have been grown on different single crystal substrates silicon, R-Al2O3, and LaAlO3 by pulsed laser deposition. X-ray diffraction XRD patterns show that the pure HfO2 thin films are ...
Optical Waveguide Lightmode Spectroscopy (OWLS) as a Sensor for Thin Film and Quantum Dot Corrosion
Contributor:Yu, Hao; Eggleston, Carrick M.; Chen, Jiajun; Wang, Wenyong; Dai, Qilin; Tang, Jinke
Optical waveguide lightmode spectroscopy (OWLS) is usually applied as a biosensor system to the sorption-desorption of proteins to waveguide surfaces. Here, we show that OWLS can be used to monitor the quality of oxide ...
Weak localization and magnetoresistance of island-like thin copper films
Contributor:Dai, Jianbiao; Tang, Jinke
We report magnetotransport and weak localization effects in island-like thin copper films. The samples show significant negative magnetoresistance (NMR) when a perpendicular magnetic field (H˔0.25 T) is applied. When the ...
Colossal magnetoresistance and magnetic phase transitions in bulk Nd0.7Ba0.3MnO3
Contributor:Wang, Kai-Ying; Sangregorio, Claudio; Wiggins, Jason; Wiemann, Joan; Tang, Jinke
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 ...