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  • 2000-2004  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Low-field magnetoresistive property of partially crystallized La0.5Sr0.5MnO3 thin films by pulsed laser deposition (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2791-2798 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: La0.5Sr0.5MnO3 thin films deposited on (001) SrTiO3 substrates at different temperatures are prepared using pulsed laser deposition, and their electro- and magnetotransport properties are experimentally evaluated. The structure analysis reveals that the thin films show amorphous, mixed amorphous/nanocrystalline as well as epitaxial microstructures, respectively, depending on the deposition temperature. While the amorphous thin film exhibits variable range hopping conduction, the epitaxial sample is metal like and ferromagnetic. Enhanced low-field magnetoresistance at low temperature for the microstructure in which the nanocrystalline phase and amorphous phase coexist is demonstrated. It is argued that the amorphous layer separating the neighboring nanocrystals behaves as barrier for the spin-dependent tunneling, resulting in enhanced magnetoresistance at low magnetic field. The modified two-channel model where the insulating conduction channel and the spin-ordered and metallic conduction channel coexist in parallel is employed to explain the magnetotransport phenomena. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288693
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  • 2
    Electronic Resource
    Electronic Resource
    Low-field magnetoresistance in nanosized La0.7Sr0.3MnO3/Pr0.5Sr0.5MnO3 composites (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1110-1112 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanosized La0.7Sr0.3MnO3/Pr0.5Sr0.5MnO3 (LSMO1−xPSMOx) ceramic composites are prepared using solid-sate sintering. Their microstructural, electro- and magnetotransport properties are characterized by means of various techniques. It is found that the antiferromagnetic/ferromagnetic coupling between PSMO/LSMO at low temperature and the weak ferromagnetic order of PSMO at high temperature results in enhanced low-field magnetoresistance (LFMR) of the composites. With increasing temperature up to 250 K the observed LFMR decays more slowly than that for pure LSMO and this behavior may be explained by the spin coupling near boundaries between LSMO and PSMO grains. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1350602
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  • 3
    Electronic Resource
    Electronic Resource
    Drift mobility of semiconductive La0.5Sr0.5CoO3 films measured using the traveling wave method (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 580-582 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The conductivity and the drift mobility of La0.5Sr0.5CoO3 films deposited on fused silica substrates at 650 °C by pulsed-laser deposition have been measured by using the traveling-wave method. At room temperature, La0.5Sr0.5CoO3 films with semiconductivity have a hole density of 1×1021 cm−3, and drift mobility of 0.01 cm2/V s. The films underwent a paraferromagnetic transition around 240 K. The hopping process and tunneling effect of small polarons may be responsible for the conductive behavior above the Curie temperature. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125823
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  • 4
    Electronic Resource
    Electronic Resource
    Scaling on hysteresis dispersion in ferroelectric systems (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 236-238 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hysteresis area as a function of frequency of the time-varying external electric field—hysteresis dispersion—for ferroelectric Pb(Zr0.52Ti0.48)O3 is measured, and the Monte-Carlo simulation on the hysteresis dispersion for a model ferroelectric lattice is performed too. We demonstrate the scaling behavior of the single-peaked hysteresis dispersion for the two ferroelectric systems, predicting a unique effective characteristic time for the domain reversal. This characteristic time shows an inversely linear dependence on the field amplitude as long as the amplitude is high enough that the reversible domain rotation response is negligible. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1384894
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  • 5
    Electronic Resource
    Electronic Resource
    Partially crystallized La0.5Sr0.5MnO3 thin films by laser ablation and their enhanced low-field magnetoresistance (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 2286-2288 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous, partial-crystallized, and epitaxial La0.5Sr0.5MnO3 thin films have been deposited at various temperatures of 200–650 °C on (001) SrTiO3 substrates using pulsed-laser deposition. The x-ray diffraction and high-resolution transmission electron microscopy indicate complete (001) orientation of the crystalline structures in these films. Enhanced low-field magnetoresistance effect has been observed for the partial-crystallized thin films where the nanosized ferromagnetic crystals are embedded in nonferromagnetic amorphous matrix. It is argued that the amorphous layer separating the neighboring nanocrystals behaves as the barrier for the spin-polarized tunneling and/or spin-dependent scattering, resulting in enhanced magnetoresistance at low magnetic field. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126332
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamic hysteresis for Potts spin system: a Monte Carlo simulation (2000)
    Springer
    Applied physics 70 (2000), S. 113-120 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 77.80.Dj; 77.80.Fm; 75.10.Hk; 77.22.Ej
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. A Monte Carlo approach based on the Q-state Potts model is developed to describe and simulate the dynamic hysteresis of Potts spin lattice against periodic time-varying external field E. The dynamic responses of the hysteresis loops against frequency ω of applied field and domain size R are studied. It is revealed that the hysteresis loops for the system energy W, polarization P, and domain wall fraction Π depend considerably on the frequency and domain size. The remnant polarization Pr shows a single-peak pattern as a function of ω. The P-E loop exhibits thin rhomb and fat rhomb patterns at low ω, whereas a tip-smoothed rhomb and roughly elliptical pattern is observed at high ω. The loop area can be scaled with Ω≈ω1/3 at low ω. The frequency dependency of the dynamic hysteresis is explained in terms of a simplified phenomenological model. At very small domain size, the dynamic hysteresis is significantly compressed, predicting the polarization weakening effect at small domain size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050022
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  • 7
    Electronic Resource
    Electronic Resource
    Interface investigation of crystallized aluminosilicate short fiber reinforced Al-12Si alloy composites (2000)
    Springer
    Journal of materials science 19 (2000), S. 1311-1313 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006776410256
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  • 8
    Electronic Resource
    Electronic Resource
    Spinodal decomposition of fine-grained binary alloys: A Monte-Carlo simulation (2000)
    Springer
    Journal of materials science 35 (2000), S. 2729-2734 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The kinetics of spinodal decomposition of binary alloys in case of finite grain size and slow grain growth is studied by applying the Monte-Carlo method where a coupled algorithm of the spin-exchange Ising model and Q-state Potts model operates. The anisotropic energy of grain boundaries is incorporated by imposing a Potts spin lattice on the Ising crystal. We simulate the phase separation where the grain size is comparable with the spinodal length on the order of magnitude. It is revealed that the grain boundaries of low excess energy as rapid channel enhance the solute diffusion, whereas those boundaries of high excess energy hinder the solute diffusion. Depending on the system supersaturation, phase aggregation preferred at the grain boundaries is demonstrated. The spinodal kinetics is modulated by the grain growth so that the Lifshitz-Slyozov-Wagner law may no longer be applicable in spite of the scaling law roughly holds in present system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004762128094
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