Now showing items 1-10 of 64
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Thickness dependence of magnetic properties of granular thin films with interacting particles
Contributor:Malkinski, Leszek M.; Wang, Jian-Qing; Dai, Jianbiao; Tang, Jinke; O’Connor, Charles J.
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 ...
Large low-field tunneling magnetoresistance of CrO2/(CrO2∕Cr2O3) powder compact with two coercivities, A
Contributor:Wang, Jingping; Che, Ping; Feng, Jing; Lu, Minfeng; Liu, Jianfen; Meng, Jian; Hong, Yuanjia; Tang, Jinke
Two channels of the conductance G exist in cold-pressed powder compacts of CrO2/(CrO2/Cr2O3), where two types of granules have different coercivities. One of the channels is the spin-dependent intergranular tunneling ...
Enhanced tunneling magnetoresistance of Fe3O4 in a Fe3O4-hexabromobenzene (C6Br6) composite system
Contributor:Wang, Wendong; He, Jibao; Tang, Jinke
Magnetotransport of Fe3O4-hexabromobenzene C6Br6 composite has been studied. Powders of C6Br6 and Fe2O3 nanoparticles were mixed together. They were annealed in hydrogen flow. There was a phase transformation from Fe2O3 ...
Current-controlled channel switching and magnetoresistance in an Fe3C island film supported on a Si substrate
Contributor:Tang, Jinke; Dai, Jianbiao; Wang, Kaiying; Zhou, Weilie; Ruzycki, Nancy; Diebold, Ulrike
A film of magnetic Fe3C islands separated by nanochannels of graphite was prepared with pulsed laser deposition on a Si substrate with a native SiO2 surface. When the temperature is increased above 250 K the resistance ...
Direct observation of strain fields in epitaxial growth Fe3O4 thin films on MgO substrates
Contributor:Chen, Y. X.; Chen, C.; Zhou, W. L.; Wang, Z. J.; Tang, Jinke; Wang, D. X.; Daughton, J. M.
Fe3O4 thin films with a thickness of about 140 nm have been deposited on MgO (001) substrates by reactive sputtering. Microstructural studies indicated that monocrystalline Fe3O4 thin films were epitaxially grown on the ...
Temperature- and magnetic-field-induced magnetization reversal in perovskite YFe0.5Cr0.5O3
Contributor:Mao, Jinhua; Sui, Yu; Zhang, Xingquan; Su, Yantao; Wang, Xianjie; Liu, Zhiguo; Wang, Yi; Zhu, Ruibin; Wang, Yang; Liu, Wanfa; Tang, Jinke
Perovskite YFe0.5Cr0.5O3 exhibits magnetization reversal at low applied fields due to the competition between the single ion magnetic anisotropy and the antisymmetric Dzyaloshinsky–Moriya interaction. Below a compensation ...
Low field intergranular tunneling effect in CrO2 nanoparticles and characterization of the barriers
Contributor:Dai, Jianbiao; Tang, Jinke
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 ...
Transport properties in chromium-doped Ti2O3 thin films
Contributor:Wang, Zhenjun; Tang, Jinke; Spinu, Leonard
In this paper, we report the transport properties of Cr-doped Ti2O3 thin films. The thin films were grown on α-Al2O3 s012d substrates by pulsed-laser deposition. X-ray diffraction and transmission electron microscopy results ...
Direct measurement of the dependence of granular giant magnetoresistance on the relative orientation of magnetic granules
Contributor:Dai, Jianbiao; Tang, Jinke
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 ...
Magnetic coupling induced increase in the blocking temperature of γ-Fe2O3 nanoparticles
Contributor:Dai, Jianbiao; Wang, Jian-Qing; Sangregorio, Claudio; Fang, Jiye; Carpenter, Everett; Tang, Jinke
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% ...