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  • 1995-1999  (7)
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Material
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Curie temperature oscillations and critical phenomena in Co/Cu multilayer films (1996)
    Springer
    JETP letters 64 (1996), S. 370-375 
    Details
    ISSN: 1090-6487
    Keywords: 75.30.Kz ; 75.40.Cx ; 75.70.Cn ; 64.60.−i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study is made of Co/Cu multilayer structures with ultrathin Co layers. Oscillations of the saturation magnetization and Curie temperature as a function of the thickness of the intermediate Cu conducting layer are observed. The behavior of the magnetization near the second-order phase transition is studied, and the critical exponents of the magnetization are determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567205
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rate-scanning modified adiabatic calorimeter (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3553-3556 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a continuous cooling method, as a simple modification of adiabatic calorimetry which typically operates in the heating mode, with the capability of varying the scanning rate in the range of 0.01–2 K/min. This method allows us to determine the absolute value of specific heat of a liquid or solid during cooling as well as during heating in the temperature range between 100 and 400 K. The typical specific heat data of a supercooled liquid [Ca(NO3)2]0.4(KNO3)0.6 agree well with results by other methods. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147063
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The 3ω technique for measuring dynamic specific heat and thermal conductivity of a liquid or solid (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 29-35 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We show how to measure dynamic specific heat and thermal conductivity of a solid or liquid sample using the 3ω technique, which is an ac-modulation method where we use a heater simultaneously as the sensor. By varying the width of the heater relative to the thermal decay length, one can choose the proper regime to measure thermal conductivity or specific heat. The technique is applied to window glass and the results confirm the validity of the method. Experimental results for potassium dihydrogen phosphate crystal demonstrate the first-order transition at the Curie point, and the dynamic specific heat of supercooled liquid potassium–calcium nitrate is shown. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146545
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    High-density transition layer in oxynitride interfaces on Si(100) (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3775-3777 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nitrided SiO2 thin films on Si wafers were studied by x-ray reflectivity measurements and their electron-density profiles were evaluated. Interfacial layers of the oxides were found to have densities higher than that of either crystalline Si substrates or strained interfacial layers of thermal oxides. The high density probably results from nitrogen incorporation near the interfaces. The present results suggest that strongly retarded boron penetration through nitrided gate oxides is due to their high-density interfacial layers. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125452
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  • 5
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of CoFe alloy films : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4764-4766 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The investigation of the structural and magnetic properties of bcc Co1−xFex (0.1〈x〈0.4) alloy films prepared on MgO(001) substrates using e-beam evaporation and pulsed laser ablation deposition (PLAD) methods is reported. Both structural and magnetic properties seem to be strongly correlated to the deposition conditions, i.e., substrate temperatures (Ts) and deposition rates (DR). To identify the stability limits of the bcc structure in the phase diagram, our study is limited to the Co-rich compounds. For x≥0.3 at high Ts (500 °C), alloy films deposited by e-beam evaporation exhibit a bcc (001) growth, showing the magnetic anisotropy with easy axis parallel to the MgO [100] crystal axis. In the PLAD technique, the excellent bcc (001) film growth is observed at Ts=300 °C for x=0.25 which is close to the concentration limit of the bcc regime in the equilibrium bulk phase diagram, whereas the same compound films deposited at high Ts reveal the mixed phase of fcc (001) and bcc (001) structures. Magnetic hysteresis measurements of the film grown by the PLAD technique exhibit similar results to those of the films deposited by e-beam evaporation. These results show that, for the well-crystallized films with a bcc (001) texture, the magnetocrystalline anisotropy develops in-plane.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365457
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  • 6
    Electronic Resource
    Electronic Resource
    Anisotropic strains and magnetoresistance of La0.7Ca0.3MnO3 (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 977-979 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of perovskite manganite La0.7Ca0.3MnO3 were grown epitaxially on SrTiO3(100), MgO(100) and LaAlO3(100) substrates by the pulsed laser deposition method. Microscopic structures of these thin film samples as well as a bulk sample were fully determined by x-ray diffraction measurements. The unit cells of the three films have different shapes, i.e., contracted tetragonal, cubic, and elongated tetragonal for SrTiO3, MgO, and LaAlO3, respectively, while the unit cell of the bulk is cubic. It is found that the samples with a cubic unit cell show smaller peak magnetoresistance at low fields ((approximately-less-than)1 T) than the noncubic ones do. The present result demonstrates that the magnetoresistance of La0.7Ca0.3MnO3 at low fields can be controlled by lattice distortion via externally imposed strains. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119705
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  • 7
    Electronic Resource
    Electronic Resource
    OEIC research in Korea (1995)
    Springer
    Optical and quantum electronics 27 (1995), S. 305-317 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This paper presents a chronological overview of Korean activities in optoelectronics and optoelectronic integrated circuits (OEICs) undertaken mainly in university laboratories. OEIC transmitters and receivers for communications and semiconductor laser logic devices for optical switching and computing are briefly described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00563565
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