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  • 1
    Electronic Resource
    Electronic Resource
    Structural and superconducting properties of Bi-Sr-Ca-Cu superconductors studied by Fe doping (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4512-4514 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 1.5% of Fe has been substituted for Cu in several "2212'' and "2223'' Bi-Sr-Ca-Cu superconductors. All of the samples show a reduction of Tc by about 13 K due to the Fe impurities. Mössbauer measurements at room temperature reveal structural characteristics such as stacking faults and intergrowth of different phases in these Bi-based compounds on the microscopic scale. The suppression of Tc due to Fe doping in the Bi "2212'' or " 2223'' system is comparable to that of the "123'' system, but much smaller than that of the "214'' system. The interplanar correlation existing in the "123'' and the Bi "2212'' and "2223''systems seems to play an important role in sustaining the high-temperature superconductivity and weakening the detrimental effect of impurity elements on superconductivity in these two systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344880
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of Fe in Fe-doped YBa2Cu3O7 superconductors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5458-5460 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of samples of YBa2(Cu1−xFex)3O7 with x ranging from 0 to 0.13 was made and investigated by x-ray diffraction, dc SQUID magnetometry, and Mössbauer spectroscopy. In the samples made by the ordinary process, Fe mainly occupies Cu(1) sites. The orthorhombic-to-tetragonal structural transition occurs at x(approximately-equal-to)0.03, and the superconducting transition temperature is depressed to zero at x(approximately-equal-to)0.17. By annealing the samples in Ar gas at 750 °C for 24 h and then reloading the lost oxygen in O2 gas at 210 °C for 48 h, we were able to draw about 30% of the Fe from Cu(1) sites into Cu(2) sites. This was verified by the enhancement of the component in the Mössbauer spectrum corresponding to Fe in the Cu(2) sites. The structural and superconducting properties of this new series of samples were also investigated. Comparison with the ordinary Fe-doped samples was also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345844
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  • 3
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of melt-spinning Pr(Fe0.6Co0.4)2 alloys (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6289-6291 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pr(Fe0.6Co0.4)2 ribbons were prepared by melt spinning with different wheel speeds from 35 to 45 m/s. Their structure, magnetic properties, and thermal stability are investigated. At a wheel speed of 35 m/s, the ribbon consists of a mixture of Pr(Fe,Co)2 cubic Laves phase and some noncubic phases. An almost Pr(Fe,Co)2 nanocrystalline single phase with a Curie temperature of 305 °C is obtained at a wheel speed of 40 m/s. Except for Pr(FeCo)2 phase a small amount of amorphous phase is observed with increasing wheel speeds to 45 m/s. Pr(Fe,Co)2 phase becomes unstable and decomposes above 770 °C. The resin-bonded Pr(Fe,Co)2 nanocrystalline phase which is obtained at a wheel speed of 40 m/s combines high magnetostriction (λ(parallel)−λ⊥=140 ppm), with significant coercivity, iHc=5 kOe. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372682
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  • 4
    Electronic Resource
    Electronic Resource
    Large magnetostriction effect in bulk (La1−xSmx)2/3Sr1/3MnO3 (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4494-4496 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of polycrystalline bulk (La1−xSmx)2/3Sr1/3MnO3 samples over a wide composition range (x=0,0.1,0.33,...,1) was prepared by solid-phase reaction sintering technique. The x-ray diffraction pattern indicates that all the samples have an orthorhombically distorted perovskite structure. A large linear magnetostriction with a value up to −180×10−6 was observed at the temperature of 77 K under the maximum magnetic field of 1.5 T. The linear magnetostriction and magnetoresistance effect of our samples has similar dependence on the Sm content x. At room temperature, the sample with a Curie temperature of 320 K, and a Sm content of x=0.33, shows both maximum linear magnetostriction value of −40×10−6 and a maximum magnetoresistance value of −12%. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370386
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic entropy change in La0.54Ca0.32MnO3−δ (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 524-526 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A La-deficient manganite perovskite sample La0.54Ca0.32MnO3−δ was prepared by conventional solid-state reaction method. The Curie temperature TC is 272 K, about 10 K higher than that of La1−xCaxMnO3. A large magnetic entropy change has been observed and the maximum −ΔSM(approximate)2.9 J/kg K appears at its Curie temperature upon a 0.9 T magnetic field change. The easy fabrication and higher chemical stability make La0.54Ca0.32MnO3−δ a suitable candidate as a working substance in magnetic refrigeration technology. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1379047
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  • 6
    Electronic Resource
    Electronic Resource
    The Hall effect of Fe–Al–O thin film (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6998-7000 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of Fe45.51(Al2O3)54.49 (volume fraction) nanogranular films were prepared using the ion-beam sputtering technique. A saturated Hall resistivity of about 12.5 μΩ cm was observed at room temperature. With different annealing temperature TA up to 300 °C, the saturated Hall resistivity of the sample decreases only a little, which shows good thermal stability. The transmission electron microscopy image shows that very small Fe particles (smaller than 1 nm) embedded in the Al2O3 matrix, and connected into the network, with the ρ–T curve indicates that this Hall effect may originate from the percolation phenomenon. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372910
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetocaloric effect in perovskite manganites La0.7−xNdxCa0.3MnO3 and La0.7Ca0.3MnO3 (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 5689-5691 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In perovskite manganites La0.7−xNdxCa0.3MnO3 (x=0, 0.05, 0.1, 0.15, and 0.20) prepared by the sol–gel technique, large magnetocaloric effects have been observed. The maximum of the magnetic entropy change peaks at the magnetic ordering temperature. Compared to La0.7Ca0.3MnO3, an enhancement of the magnetocaloric effect has been obtained in the samples with Nd3+ dopant (for La0.5Nd0.2Ca0.3MnO3, the maximum of ΔSM is about −2.31 J/kg K). © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1415055
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  • 8
    Electronic Resource
    Electronic Resource
    The properties and magnetically softened grain boundaries of Nd10Fe84−xB6Inx (x=0,1,2) exchange coupling magnets (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 7230-7233 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic behavior of Nd10Fe84−xB6Inx (x=0,1,2) nanocomposites was investigated. It was found that a certain amount of indium (x=1) added to Nd10Fe84B6 magnets enhances the hard magnetic properties. The optimum coercivity and remanence ratio was increased from 5.0 kOe and 0.71 to 5.8 kOe and 0.83, respectively. The squareness of the hysteresis loop is improved greatly. The maximum magnetic energy product (BH)max increases remarkably from 12 to 18 MGOe. The origin for those enhancements is mainly attributed to the magnetically softened grain boundaries and enhanced crystallographical coherency by indium addition. The magnetic annealing is found to be helpful to enhance the coherency and coupling between hard and soft phases. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1323530
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  • 9
    Electronic Resource
    Electronic Resource
    The tunneling magnetoresistance of Co35(SiO2)65 nanogranular films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 3421-3423 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of Co35(SiO2)65 (volume fraction) nanogranular films were prepared by ion-beam sputtering at room temperature. A tunneling magnetoresistance (TMR) of about 4% at room temperature was observed. With applied magnetic field of about 1.5×103 Oe parallel to the plane of substrates during fabrication, the TMR ratio of the sample increased up to about 5% at room temperature. The results of ferromagnetic resonance showed that the isolated Co particles embedded in the SiO2 matrix were pancake-like in shape. Thus the discrepancy of TMR between the applied magnetic field parallel and perpendicular to the plane of the sample may be due to shape-induced anisotropy. ©2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372361
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  • 10
    Electronic Resource
    Electronic Resource
    Exchange coupling in Fe50Mn50/Ni81Fe19 bilayer: Dependence on antiferromagnetic layer thickness (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4931-4933 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have determined the dependence of exchange coupling on the antiferromagnetic layer thickness (tAF) in FeMn/NiFe bilayers, where the FeMn layer varies from 0.5 to 32 nm, and the NiFe is constant at 30 nm. For tAF〉3 nm, the exchange field Hex varies as (1/tAF)0.3 at both 80 and 300 K, whereas the coercivity is insensitive to tAF. The value of Hex displays a simple angular dependence of cos θ. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369146
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