ORCID Profile
0000-0003-4233-2006
Current Organisation
Tianjin University
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Publisher: Elsevier BV
Date: 08-2004
Publisher: Elsevier BV
Date: 12-2004
Publisher: American Scientific Publishers
Date: 03-2009
DOI: 10.1166/JNN.2009.395
Abstract: Molecular dynamics calculations of the fluctuation of bond vibration revealed the shell-resolved mode of surface melting of the a closed-shell cluster containing 147 atoms with Lennard-Jones type interaction. It is found that the surface melting is imitated by the migrating of the vertex atoms. Although the melting process of the LJ147 cluster could be ided into discrete stages of surface shell-by-shell melting in general, there is still a continuous process of melting from the surface shell to the core interior.
Publisher: IOP Publishing
Date: 15-04-2005
Publisher: AIP Publishing
Date: 05-01-2015
DOI: 10.1063/1.4905357
Abstract: On the benefit of the concept of the so-called diluted magnetic oxides, Fex(ZnO)1–x (x = 0.50–0.85) granular thin films with different thickness through 2D and 3D percolation region were prepared by ion beam assisted deposition. All s les are ferromagnetic at room-temperature due to the ferromagnetic nature of the Fe-doped ZnO matrix, which is quite different from the superparamagnetic behavior in the insulator-matrix based granular films. Along with decreasing thickness, the Hall coefficient RS is largely enhanced. The maximum RS reaches 4.27 × 10−7 m3/C in ∼2.8 nm Fe0.6(ZnO)0.4 granular film, which is nearly 9 times larger than the RS (4.64 × 10−8 m3/C) of the ∼50 nm Fe0.6(ZnO)0.4 s le. Meanwhile, the RS could maintain in a wide temperature region from 10 K to 300 K and the Hall sensitivity reaches ∼130 V/AT at room-temperature. The scaling exponential of n = 1.7 ± 0.1 in σxy∼σxxn is observed, fitting well with the recent developed universal scaling theory characterized by n = 1.6 in the dirty limit.
Publisher: Elsevier BV
Date: 04-2006
Publisher: AIP Publishing
Date: 28-10-2019
DOI: 10.1063/1.5120838
Abstract: In this work, epitaxial La1–xSrxMnO3 (LSMO) films were fabricated on SrTiO3 substrates at temperatures (Ts) ranging from 550 to 750 °C by RF magnetron sputtering. Significant Ts-dependent structural, magnetic, and magnetotransport properties were observed. The LSMO (Ts = 750 °C) film exhibits the colossal magnetoresistance (CMR) of −47% under the magnetic field (H) of 5 T. In contrast, the LSMO (Ts = 650 °C) film demonstrates a huge magnetoresistance (MR) of −98% (H = 5 T) around the metal-insulator transition temperature and –59% at 5 K. The spin-glass-like behaviors indicate that the defects, particularly the oxygen vacancies, in the epitaxial LSMO (Ts = 650 °C) films destroy the double exchange. The huge MR is related to the defect modulated magnetic structures and spin-dependent magnetotransport properties. Our work helps to understand the physical mechanism of the CMR and provides a way for tuning the magnetotransport properties of the perovskite films.
Publisher: AIP Publishing
Date: 24-07-2006
DOI: 10.1063/1.2240139
Abstract: Amorphous CrxTi1−xO2 films with different Cr concentrations of 0⩽x⩽0.16 were prepared by cosputtering method at room temperature. All as-deposited s les show hysteresis behavior from 2to340K and the Curie temperatures are well above 390K. The saturation magnetization is about 3.21×10−1μB∕Cr for x=0.05 at 340K and decreases with increasing Cr dopant. After annealing at temperature above 300°C, the films crystallized into anatase structure and lost their ferromagnetic property. The results indicate that the ferromagnetism in amorphous Cr-doped TiO2 films is intrinsic and the structural defects play an important role in the ferromagnetism of Cr:TiO2 system.
Publisher: Elsevier BV
Date: 05-2004
Publisher: Elsevier BV
Date: 05-2004
Publisher: Elsevier BV
Date: 09-2005
Publisher: AIP Publishing
Date: 05-06-2006
DOI: 10.1063/1.2209880
Abstract: Fe-incorporated amorphous TiO2 films with different Fe volume fractions of 0.46⩽x⩽0.76 were deposited by cosputtering iron and Ti targets in an Ar+O2 mixture. X-ray diffraction and x-ray photoelectron spectroscopy analyses give a structure of nanosized Fe particles embedded in amorphous TiO2 matrix for the Fex(TiO2)1−x films. Magnetic measurements show antiferromagnetic coupling between nanoscaled Fe granules when x& .60. The magnetoresistance of Fe0.46(TiO2)0.54 is about −7.6% at room temperature, which increases dramatically with decreasing temperature below ∼100K and reaches −29.3% at 3K. This significant enhancement of magnetoresistance can be qualitatively explained by antiferromagnetic coupling between Fe granules.
Publisher: Elsevier BV
Date: 10-2006
Publisher: Elsevier BV
Date: 06-2007
Publisher: American Physical Society (APS)
Date: 17-11-2009
Publisher: Elsevier BV
Date: 05-2004
Publisher: Elsevier BV
Date: 10-2007
Publisher: IOP Publishing
Date: 10-2008
Publisher: AIP Publishing
Date: 13-08-2007
DOI: 10.1063/1.2772176
Publisher: American Scientific Publishers
Date: 08-2009
Abstract: The dynamics of the monopole collective vibration of a Leonard-Jones 147-atom cluster has been examined using molecular dynamics simulation. It is found that the process of energy release of the vibrating cluster depends on the extent of the initial atomic dislocation stimulus. A relatively larger-scale perturbation will cause a faster decay of the vibration magnitude despite the higher potential and kinetic energy compared to the vibration stimulated by a small-scale dislocation stimulus. Due to the compression by the outermost shells, the potential energy of atoms in the inner shells increases while that of the outer shells decreases during the process of energy release until equilibrium state. Findings provide hitherto insight into the dynamics of energy releases of an atomic cluster induced by a sudden dislocation stimulus.
Publisher: Elsevier BV
Date: 06-2007
No related grants have been discovered for Zhi-Qing Li.