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  • American Institute of Physics (AIP)  (2)
  • 1995-1999  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic and transport properties of Pb perovskites and Fe containing giant magnetoresistance perovskites : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7171-7173 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic and magnetoresistive properties of the Ln0.7Pb0.3Mn1−xFexO3 (Ln=La, Nd, and x=0, 0.1) perovskites, prepared by the solgel low temperature method, have been studied. In all cases the exact stoichiometry is different from the nominal one probably due to the presence of cation vacancies. All the phases exhibit ferromagnetic behavior with Tc values ranging form 345 K observed for La0.7Pb0.3MnO3 to 75 K for Nd0.7Pb0.3Mn0.9Fe0.1O3. The 10% Fe contribution lowers the Tc by about 130 K in the La compound and 90 K in the Nd one. These results can be interpreted in terms of antiferromagnetic coupling between Mn and Fe. However, the influence of the Nd ions is not well known although it seems not ordered down to 10 K. The magnetoresistence [MR=ΔR/R(0)] measured at 6 T in pellets of pressed powder reaches values of about 80% around the magnetic transition. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367993
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetoimpedance effect in CoFeNi plated wire with ac field annealing destabilized domain structure (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5438-5440 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Giant magnetoimpedance (GMI) behavior at 0.25 MHz has been studied for a composite wire consisting of a 1 μm thick Co6Fe20Ni74 magnetic layer electroplated onto a 0.1 mm diam CuBe nonmagnetic wire. This has been done for as-deposited samples as well as after annealing under dc and ac axial magnetic fields. In the optimum conditions, a maximum GMI of 150% is achieved. The observed GMI hysteresis in the as-prepared state decreases for high driving current used to measure the MI itself. Such hysteresis, to be avoided in technological applications, is also very much reduced after ac field annealing. GMI characteristics are analyzed considering the domain-wall stabilization occurring after the annealing treatments. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369968
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