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  • 1
    Electronic Resource
    Electronic Resource
    An investigation of La1−xSrxMnO3 near x=0.5 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5028-5030 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have done a systematic study of the ac susceptibility, dc magnetization, and ferromagnetic resonance in a set of polycrystalline samples of La1−xSrxMnO3 with nominal x values varying from 0.46 to 0.53 at 0.01 intervals. Apart from noting the remarkable changes attendant on small variations in x, it is found that at low T, one has coexistence of ferromagnetic and antiferromagnetic phases. The resonance data are interpreted to provide a measure for the size of the ferromagnetic regions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373237
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  • 2
    Electronic Resource
    Electronic Resource
    Half-point fields for microwave magnetoabsorption in colossal magnetoresistance manganite powders (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 2652-2654 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We reexamine the recently discovered giant microwave magnetoimpedance in manganite powders. The absorption consists of two components, a resistive part which is only weakly field dependent, and a low-temperature spin-dependent part, which gives rise to the giant effects. We propose that the half-point field H0, required to reduce the spin-dependent absorption to one half of its value at zero field, arises from the magnetic anisotropy consequent on the strains in the grains. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372233
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  • 3
    Electronic Resource
    Electronic Resource
    Silver ion implantation in epitaxial La2/3Ca1/3MnO3 thin films: Large temperature coefficient of resistance for bolometric applications (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 2104-2106 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial films of La2/3Ca1/3MnO3 were successively implanted with 100 and 200 keV silver ions at fluences of 4.5×1015 and 1×1016 ions/cm2, respectively, to achieve a fairly uniform implant distribution. The as-implanted films are insulating and do not show a metal–insulator transition. Postimplantation annealing at 950 °C shows a recovery of the high structural quality of the films, along with an increase in the metal–insulator transition temperature (Tp), magnetoresistance, and the peak temperature coefficient of resistance (TCR) at the transition. The peak TCR of 23% for manganite films is clearly significant for bolometric applications. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126269
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  • 4
    Electronic Resource
    Electronic Resource
    90 MeV 16O ion irradiation effects on transport and magnetization in epitaxial thin films of La0.75Ca0.25MnO3 : 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. 7174-7176 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of 90 MeV 16O ion irradiation on the electric and magnetic properties of epitaxial thin films of La0.75Ca0.25MnO3 is studied. These films were deposited on LaAlO3(100) substrates by the pulsed excimer laser deposition technique. The thickness of each film was about 3000 Å. The high quality of the films was ensured by x-ray diffraction and transport measurements. The films were irradiated with 90 MeV oxygen ions at different doses (1011–1014 ions/cm2). It is observed that at a low dose of 1011 ions/cm2 the resistivity peak temperature (Tp) and the Curie temperature (Tc) increase, however as the dose is increased further, the Tp and Tc decrease. At the higher dose of 1014 ions/cm2, the film becomes insulating and does not show any peak in the resistivity–temperature curve down to 60 K. These results are discussed in terms of the effects of ion induced compositional inhomogeneity and strain on the film properties. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367792
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  • 5
    Electronic Resource
    Electronic Resource
    Pulsed excimer laser etching of La0.75Ca0.25MnOx thin films (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3644-3646 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulsed (λ=248 nm, pulse width=20 ns) KrF-excimer-laser-induced etching of La0.75Ca0.25MnOx (LCMO) thin films exhibiting giant magnetoresistance (GMR) has been studied. The variation of etch depth as a function of the number of laser pulses shows a linear dependence in the fluence range between 0.15 and 4 J cm−2. The threshold fluence for ablation is found to be 0.07 J cm−2. The photoetching process is seen to follow the Beer–Lambert's relation based on a linear absorption model with an absorption length of 28.3 nm. The nanomorphology of the laser etched surface as revealed by atomic force microscopy shows significant improvement in the surface smoothness of the deposited films for etching at low energy densities (typically 0.17 J cm−2) and enhanced roughness at higher energy densities (typically 0.86 J cm−2). Changes in the resistivity and GMR effect due to laser treatment are also examined. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115345
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  • 6
    Electronic Resource
    Electronic Resource
    Ferromagnetic resonance in Ni–Mn–Ga films (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 1279-1281 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Textured thin films of nominal composition Ni0.50(MnGa)0.50 were sputter deposited on Si substrates and studied by x-ray diffraction, micromechanical displacement, dc magnetization, and ferromagnetic resonance (FMR). We report the observation of spin wave resonances in this alloy, yielding a spin wave stiffness of D=200 meV Å2 at 300 K. A marked thermal hysteresis is observed in the temperature-dependent FMR data arising from the reversible martensitic transition. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1501161
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  • 7
    Electronic Resource
    Electronic Resource
    On the existence of canted spins in Mg-Zn system (1992)
    Springer
    Czechoslovak journal of physics 42 (1992), S. 339-343 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The variation of magnetization as a function of Zn concentration in the Mg-Zn system is measured using a high-field loop tracer at liquid nitrogen temperature. The XRD studies show that the lattice parameter increases linearly with increase in the zinc content. The magnetization is found to increase with the zinc concentration, reaches a maximum atx=0.2 and thereafter falls to zero for non magnetic zinc ferrite, which is the behaviour similar to other zinc containing ferrites. The variation of magnetization as a function of zinc content suggests the existence of a canted type of spin arrangement in this system. The cation distribution is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01598430
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  • 8
    Electronic Resource
    Electronic Resource
    Conductivity and cation distribution in CuxMg1−xFe2O4 system (1992)
    Springer
    Czechoslovak journal of physics 42 (1992), S. 939-945 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electrical conductivity and magnetization of Cu x Mg1{x Fe2O4 are measured. The electrical conductivity obeys the exponential behaviour characteristic of semiconducting materials. The activation energy in the paramagnetic region is found to be greater than that in the ferrimagnetic region. This is attributed to the change in magnetic ordering. It is observed that the plots of logQ vs 103/T exhibit a linear relationship throughout the temperature region studied (room temperature to 1000 K). The slope of the plot changes at a particular temperature recognized as Curie temperature. These temperatures agree well with the experimentally obtained Curie temperatures using Laroia technique. Hopping of polarons mechanism is used to explain the conduction behaviour in ferrites. The magnetic moment (nB) is calculated from the magnetization studies carried out at 78 K. The cation distribution is suggested on the basis of these magnetization data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01605170
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