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  • 1990-1994  (3)
  • 1980-1984  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Concentration dependence of the random field crossover scaling in FexZn1−xF2 : 35th annual conference on magentism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5246-5248 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The proportionality between the field-induced shift ΔTc(H) of the transition temperature Tc(H) and the root-mean-square (rms) random-field hRF was studied over a wide range of concentration (0.31≤x≤0.84) in the nearly ideal random-field Ising model (RFIM) system FexZn1−xF2. Tc(H) was determined experimentally from the optical birefringence Δn, for which d(Δn)/dT exhibits a peak proportional to the magnetic specific heat. For all x studied, Tc(H) was found to shift from the H=0 transition at TN as ΔTc(H)ΔTc(H)= cTN h2/φRF as predicted, with φ=1.42±0.03 the universal random exchange to RFIM crossover exponent, after a mean-field correction bH2. The nonuniversal quantity c was found to be of order unity as expected, but slightly x dependent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348093
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Antiferromagnetic standing-spin-wave resonance in epitaxial films of MnF2 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5518-5520 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Standing-spin-wave resonance (SSWR) modes have been observed in an antiferromagnet for the first time. The experiments were performed on MnF2 films of thicknesses t=0.98 and 0.23 μm, grown epitaxially on carefully polished (001) Mn0.99Fe0.01F2 substrates. An intervening 1.0-μm-thick homoepitaxial, buffer layer of Mn0.99Fe0.01F2 was first deposited to improve both the epitaxial growth and thickness uniformity of the final MnF2 film. The observed SSWR modes exhibit spacings ΔHn appropriate to the boundary conditions in which the spins are pinned at both interfaces. From the spacings of the modes, a value of the spin-wave stiffness constant is obtained which is in good agreement with the calculated value from the known exchange and anisotropy interactions of bulk MnF2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345870
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Concentration scaling of the specific heat in the d=3 random exchange Ising model system FexZn1−xF2 : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5075-5077 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Linear magnetic birefringence Δnm was used to study the concentration dependence of both the total magnetic specific heat Cm and critical amplitudes in the random exchange Ising model (REIM) system FexZn1−xF2. We find the proportionality between Δnm and the magnetic energy Um is x independent for 0.24≤x≤1.0, since Δnm scales with x2 as does Um. However, the critical part of Cm is found to decrease with dilution very much faster than x2. To explain this, a scaling form is derived which describes the x-dependent crossover from pure Ising to REIM with a crossover exponent φ=α, the pure Ising specific heat exponent. The critical amplitudes A± of Cm = A±||t − tn||−α˜ are shown to scale as A±(x)A±(x)∼ (1 − x)(α˜−α)/(φ)∼ (1 − x)−1.9(3), using the experimental REIM value of α˜=−0.09(3), and theoretical value of α=0.105(7). Good agreement between theory and experiment is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348127
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Aspects of magnetic disorder (1984)
    Springer
    Hyperfine interactions 18 (1984), S. 403-412 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A brief review is given of the effects that quenched, magnetic disorder have on the magnetic properties of systems with short-range interactions. Of primary interest are random exchange, random anisotropy and random fields. Recent theoretical and experimental studies have begun to illuminate the unusual critical behavior that is seen in randomly diluted antiferromagnets in the presence of a uniform field, which is the most direct manner by which the random field problem may be approached. Considerable uncertainty still exists as to what is the lower critical dimensionalityd 1 and the effective dimensionality ¯d ford-dimension Ising systems in the presence of a random field. This whole area appears to be one in which further insight might be gained through the application of microscopic probes such as NMR, Mössbauer Effect andμSR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064846
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    Paper (German National Licenses)
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