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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2171-2173 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method of manufacturing granular Fe–Pb–O films is described. The temperature dependence of resistivity in these samples exhibits a semiconductorlike behavior indicating that the electronic transport takes place via a tunneling process. The magnetoresistance ratio has been found to be about 10% at room temperature. The enhancement of the tunneling magnetoresistance effect is believed to be due to spin-dependent tunneling through the tunneling barrier containing magnetic ferrite formed by PbO and α-Fe2O3. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7152-7154 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cr is an antiferromagnet with a Néel temperature of 311 K. The addition of impurities will alter the antiferromagnetic properties of materials. Studies of the effect of magnetic Gd atoms on the Cr-rich CrxGd1−x alloys are reported. The metastable CrxGd1−x alloy films (1.00≥x≥0.96) have been prepared by the rapid-quenching method. It has been found from x-ray diffraction that the alloy films with 1.00≥x≥0.97 have body-centered-cubic structure, the same as Cr. For higher Gd concentration, the alloy film contains both body-centered cubic and amorphous phases. The variation of the Néel temperature TN as well as the spin-flip temperature TF of metastable Cr-Gd alloys has been investigated by resistiviity measurements between 10 and 300 K. It has been found that TN decreases slowly from 311 K for pure Cr to about 290 K for Cr0.97Gd0.03. These results seem to indicate that magnetic Gd atoms show little effect on the antiferromagnetism of Cr. Furthermore, there is a broad resistivity minimum at low temperatures. This broad minimum occurs at higher temperature as Gd concentration is increasing. Thus, it suggests that a different mechanism accounts for this resistivity minimum. A detailed discussion is reported.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Acicular α-FeOOH particles with particle length of about 0.2 μm and axial ratio of about 8 were used as the starting material to prepare acicular Fe-Co alloy particles. They were made by adsorbing Co(OH)2 on the surface of α-FeOOH particles, followed by dehydration, annealing, and reduction. In order to prevent sintering at high temperatures, the Co-α-FeOOH particles were first dehydrated at 300 °C and then coated with a thin layer of silica before high-temperature treatments. Furthermore, after reduction, the metallic powder was immersed in toluene to avoid oxidation. The particle structure of Fe-Co was determined from x-ray diffraction. It has been found that, up to 50 at. % Co, all the Fe-Co particles have the same bcc structure and similar lattice constant. The magnetic properties of Fe-Co alloy particles with different Co concentrations were investigated using a vibrating sample magnetometer. The specific saturation magnetizations σs are about 30% below those of bulk materials. The maximum value of σs at room temperature is obtained with 42 at. % Co. The coercivity that mainly originates from shape anisotropy is as high as 1250 Oe for the particles with 33 at. % Co. Furthermore, σs drops sharply with Si content while Hc peaks at 0.6% Si. The coercivities of the particles also depend on the crystallite size. Hc shows a maximum when the crystallite size is about 300 A(ring).
    Type of Medium: Electronic Resource
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