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  • 1
    Electronic Resource
    Electronic Resource
    The behavior of the spontaneous resistive anisotropy near a ferromagnetic and a reentrant transition (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4844-4846 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the spontaneous resistive anisotropy (SRA) are presented at 1.5 and 4.2 K on numerous ferromagnetic PdNi alloys and on a reentrant (PdFe)Mn sample. At 1.5 K the SRA in PdNi is shown to exhibit a power-law dependence on reduced composition of the form (1−c/c0)Δ, where c0=2.25(±0.05) at. % Ni is the critical concentration necessary to establish a ferromagnetic ground state, and the exponent Δ is estimated at 2.25(±0.1). In the archetypal reentrant system (Pd99.65Fe0.35)95Mn5 [Tc=9.30(±0.02) K, TSG=4.07 (±0.05)K from ac susceptibility data] the longitudinal and transverse magnetoresistance is strong and negative at both 4.2 and 1.5 K, and as a result the very small SRA is difficult to extract with any precision. Consequently, there is no clear indication from this particular transport coefficient of the transverse freezing predicted to occur at TSG in this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344755
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  • 2
    Electronic Resource
    Electronic Resource
    Measurements of the ac susceptibility and the spontaneous resistive anisotropy in dilute P(underbar)d(underbar)Fe : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5674-5676 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of detailed measurements of the field and temperature dependent ac susceptibility (χac) and the spontaneous resistive anisotropy (SRA) of P(underbar)d(underbar)Fe samples with between 0.35 and 2.4 at. % Fe are summarized. The χac data enable estimates for the critical exponents γ, β, and δ to be made, and in the 1.4 at. % sample these are close to Heisenberg model predictions. In the other samples evidence is found for exchange bond disorder. The SRA results are consistent with this transport coefficient exhibiting critical behavior governed by percolationlike behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353587
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  • 3
    Electronic Resource
    Electronic Resource
    Preisach analysis of two ferromagnetic perovskites: La0.95Mg0.05MnO3 and La0.5Sr0.5CoO3 (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7248-7250 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the major hysteresis loop and of the temperature dependence of the field cooled and zero field cooled moment in applied fields less than the coercive field have been performed on two ferromagnetic perovskites La0.95Mg0.05MnO3 and La0.5Sr0.5CoO3. The data have been analyzed within the framework of a generalized Preisach model which includes thermal fluctuations, critical effects, and a temperature dependent distribution of free energy barriers. The analysis shows that the response functions of the manganese perovskite are dominated by the growth of the anisotropy barriers, while in the cobalt perovskite, thermal fluctuations and barrier growth play a roughly equal role. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1355340
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  • 4
    Electronic Resource
    Electronic Resource
    Superconducting properties of Fe-doped YNi2B2C : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6561-6563 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of Fe substitution for Ni in the intermetallic superconductor YNi2B2C are reported. Samples of nominal composition Y(Ni1−xFex)2B2C with x=0.01, 0.02, 0.05, and 0.1 have been prepared and subsequently characterized by x-ray diffraction, ac susceptibility, and resistivity/magnetoresistance measurements. A summary of these data is presented, and these are compared and contrasted with both the behavior previously reported for and the conclusions drawn from Fe and Co doping in this system. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361946
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of exchange bond disorder on the magnetic properties of (Pd1−xFex)95Mn5 near Tc : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6356-6358 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A summary of a detailed study of the field and temperature dependent ac susceptibility of a series of ternary (Pd1−xFex)95Mn5 alloys near the ferromagnetic ordering temperature Tc is presented. By following the behavior of the crossover line (a line of maxima in the field dependent susceptibility above Tc, the maxima moving upwards in temperature but decreasing in amplitude with increasing field) it is possible to catalog the influence of exchange bond disorder on aspects of the critical behavior. These ternary systems are not soft ferromagnets and thus asymptotic critical exponents are difficult to estimate using this technique. Nevertheless, effective exponents (i.e., obtained away from the critical point) clearly reflect the presence of significant variance in the distribution of exchange bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358265
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of exchange bond disorder on transport measurements : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6510-6512 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the low field resistive anisotropy (LFRA) in amorphous Fe91Zr9 with and without hydrogen loading are presented. The temperature dependence of these data is compared with model calculations of the quadrupolar term [〈〈S2Z〉T〉J−S(S+1)/3], from which it is concluded that the model calculations reproduce both the temperature and the exchange bond dependence of this transport coefficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356931
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  • 7
    Electronic Resource
    Electronic Resource
    The spontaneous resistive anisotropy in amorphous and hydrogenated FeZr (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5964-5966 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the spontaneous resistive anisotropy(SRA)—basically the difference between the longitudinal and transverse magnetoresistance extrapolated to zero induction—in amorphous FeZr as a function of field (0–1 T) and temperature (1.5–300 K) are presented. The Fe concentrations investigated range from 89 to 92 at. % and the effects of hydrogenation have also been studied. For the hydrogen-free samples a nonzero SRA develops at the ferromagnetic ordering (Curie) temperature Tc and persists to the lowest attainable temperature, with no obvious anomaly in the vicinity of the proposed transverse-spin freezing temperature Txy. With the inclusion of hydrogen, both Tc and the magnitude of the SRA increase, and attempts are made to correlate such increases with the changes in band structure and mean iron moment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346029
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  • 8
    Electronic Resource
    Electronic Resource
    Longitudinal and transverse magnetoresistance and magnetoresistive anisotropy in ternary (Pd1−xFex)95Mn5 alloys : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7108-7110 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A summary of detailed measurements of the longitudinal and transverse magnetoresistance, and of the anisotropy in the magnetoresistance of ternary (Pd1−xFex)95Mn5 samples, is presented. While neither the longitudinal nor the transverse magnetoresistance saturate, these data suggest that the anisotropy (i.e., the difference) might become field independent in quite moderate fields. This feature enables a comparison to be made between this ternary system and binary PdFe, as a function of composition and temperature
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356694
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  • 9
    Electronic Resource
    Electronic Resource
    $\mathsf{La_{0.5}Sr_{0.5}CoO_{3}}$ : A ferromagnet with strong irreversibility (2003)
    Springer
    The European physical journal 37 (2003), S. 285-292 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. This paper presents a summary of measurements of the field and temperature dependence of the ac susceptibility, magnetic hysteresis isotherms, and the zero field cooled (ZFC) and field cooled (FC) moment. These results demonstrate that La0.5Sr0.5CoO3 is consistently and comprehensively described as a ferromagnet with strong irreversibility. Analysis of the ac susceptibility demonstrates unequivocally the occurrence of a continuous (second order) paramagnetic to ferromagnetic phase transition with mean-field-like effective exponents (although estimates for the true, asymptotic critical exponents appear precluded by the substantial anisotropy/coercivity, linked to the presence of Co ions). The behaviour of the irreversible response is analyzed within the framework of a Preisach model which decomposes the magnetizing process into a sequence of two-state Barkhausen excitations. The model is able to replicate the field and temperature dependence of the hysteresis isotherms and the FC and ZFC moments, and shows that these response functions are a product of field activated transitions over a spectrum of temperature dependent metastable state excitation barriers, with a negligible contribution from thermal fluctuations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00058-4
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