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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic viscosity in Ni/Cu compositionally modulated alloys (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4904-4906 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The existence of a magnetic aftereffect (magnetic viscosity) in Ni/Cu multilayered alloys was established using a vibrating sample magnetometer at room temperature and at 86 K. It was shown that the effect is strongly dependent on the step field H2 (i.e., the value the field is reduced to after the magnetic moment has been aligned in high field) and exhibits a maximum relaxation rate for values of H2 around the reverse coercive field −Hc. Aftereffect behavior of this type has been observed in other materials, although most often for systems composed of superparamagnetic particles, where the relaxation freezes out at low temperatures. In contrast, the relaxation in the CMA was shown to be enhanced at 86 K over its value at room temperature. New measurements over a wider temperature range show that the enhancement in this sample reaches a maximum near 120 K, but below that temperature the relaxation does freeze out. The temperature of maximum enhancement varies from sample to sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344726
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  • 2
    Electronic Resource
    Electronic Resource
    Fe Mössbauer effect in YxPr1−xBa2(Cu0.98Fe0.02)3O7 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5029-5031 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 57Fe Mössbauer effect and magnetic-susceptibility measurements were performed on Y0.2Pr0.8Ba2(Cu0.98Fe0.02)3O7−δ and Y0.8Pr0.2Ba2(Cu0.98Fe0.02)3O7−δ, where δ≈0. The insulating 80% Pr compound showed susceptibility anomalies and a large hyperfine field distribution at low temperatures in addition to a hyperfine field spectrum for Fe on the Cu(2) sites. The superconducting 20% Pr compound displayed none of these effects at any temperature. After examining the alternatives, it is postulated that magnetic ordering of the Pr ions and an enhanced rare-earth transition-metal interaction due to f-electron admixture is responsible for these observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344713
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic viscosity investigations of nanograin iron powder : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5456-5458 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties of three kinds of nanograin Fe powder were studied. The first two, designated as NM(Ar) and NM(N), were obtained by ball milling the iron powder under an argon or nitrogen atmosphere. The third, designated NN, was obtained by evaporation and condensation. They have grain sizes of 20, 7, and 60 nm, respectively. The particle sizes of the first two were in the micrometer range, whereas those of the NN were in the nanometer range. The NN powder exhibited a coercivity of 79 mT; its magnetic moment at saturation was lower than that of bulk iron. The coercivities of the NM(N) and NM(Ar) were much smaller and their magnetic moment values at high fields were closer to that of bulk iron (210 A⋅m2/kg). The NM(N) and NN samples exhibited marked time dependences of the magnetic moments following a relatively abrupt change of the applied field. The moment changes by more than 0.5% of the saturation moment within 50 min and continues to change for many hours. Much smaller effects were detected in the NM(Ar) sample. The viscosities were investigated as a function of temperature and jump field. The results showed differences in the behavior of the three samples. The powders were consolidated by cold isostatic pressing followed by sintering at around 600 °C for several hours. The magnetic behavior of the sintered samples approach that of bulk iron. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362336
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature hysteresis and time-dependent effect in the initial susceptibility of rapidly solidified Monel (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3620-3620 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the ac susceptibility for a Cu-Ni alloy near the Monel composition (28 at. % Cu) was previously reported.1 A careful recording of this temperature dependence revealed the existence of temperature hysteresis for both the as-spun condition and after various isothermal anneals. The hysteresis is exhibited by higher susceptibility values during the cooling-down period compared to the warming up. The difference exists over the entire temperature range, though it is most pronounced around the peak. The peak for the as-spun sample is broader and therefore the effect is more clearly observed there. The time dependence decrease of the ac susceptibility was followed at room temperature for both the as-spun and the annealed samples and was found to have a long time constant. The decrease could be abruptly generated by "shaking'' the sample with an external disturbing magnetic field. The hysteresis is attributed to the fact that above the peak and just below the Curie temperature, the sample is magnetically soft and is magnetized parallel or antiparallel to the alternating small magnetic field. Due to relaxation effects below the ac susceptibility peak (and the corresponding increase of the anisotropy), the direction of the magnetization tends to rotate to the local easy direction, but since the relaxation time constant is long compared to the measuring period, it partially retains its previous direction and thus the susceptibility remains higher during the cooling duration. The anisotropy keeps it at the lower value when the temperature is increased again.2
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340714
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties of thin-film Ag+iron-oxide granular metals (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4261-4263 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of iron-oxide particulates dispersed in silver (prepared by rf diode sputtering silver and iron oxide over a wide composition range) have been investigated using the Mössbauer effect, electron microscopy, and vibrating sample magnetometry. The sputtered films are nanocrystalline mixtures of immiscible particles of the two constituents (even when only a very small amount of silver is present). At room temperature, the Mössbauer effect data show that for most compositions (even those with low silver content) the majority of the film is superparamagnetic, with the fraction of material in the superparamagnetic state increasing with increasing Ag content. Consistent with these results, very narrow hysteresis loops were observed. On decreasing the temperature to near 100 K, the fraction of material in the superparamagnetic state decreased and the magnetically ordered component increased. Electron diffraction patterns clearly showed the presence of polycrystalline Ag and Fe3 O4 in the films, but composition analysis (0.03 μm resolution) was unable to separate these regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341146
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic aftereffect in textured Ni/Cu compositionally modulated alloys (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3223-3223 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The existence of a magnetic aftereffect ("magnetic viscosity'') in textured Ni/Cu multilayered alloys was established1 using a vibrating sample magnetometer at room temperature and at 86 K. It was shown that the effect is strongly dependent on the step field, H2 (i.e., the value the field is reduced to after the magnetic moment has been aligned in high field), and exhibits a maximum relaxation rate for values of H2 around the reverse coercive field, Hc. Aftereffect behavior of this type has been observed in other materials, though most often for systems composed of superparamagnetic particles, where the relaxation freezes out at low temperatures. In contrast, the relaxation is enhanced at low temperature in the present situation. Several questions remain open from this earlier work. Among these are: is the effect a property of a thin Ni film or is it attributable to the compositional modulation of the alloy?; what is the exact form of the time decay and what is the mechanism that causes this effect? In order to resolve some of these issues the magnetic aftereffect has been measured in more detail and for longer periods of time at both temperatures (room and 86 K) in a new set of [111]-textured, layered Cu/Ni alloys of varying thicknesses. The slab thickness of the Ni, dNi, was varied between 6 and 30 A(ring), and the ratio dNi/(dNi+dCu) between 0.1 and 0.8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340848
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic behavior of both superconducting thin films and their deposition targets (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4199-4201 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The superconducting properties of the bulk oxides La1.85Sr0.15CuO4−x and Ba2YCu3O7−y were investigated through their magnetic behavior by vibrating-sample magnetometry and complex ac susceptibility, and by dc resistivity and microwave response. These oxides were then used as targets in the preparation of thin films using a laser-ablation technique. The superconducting properties of the films were established through their microwave response. The M-H loops at low temperatures clearly establish the type-II behavior of the Ba-Y-Cu-O materials. The real part of the ac susceptibility showed the superconducting transition. Simultaneously, the imaginary part of the ac susceptibility showed the existence of nonsuperconducting portions in the samples which have a low enough resistivity to carry a significant amount of current. The novel method of microwave response was used to detect the superconductivity for both the bulk oxides and the thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340223
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  • 8
    Electronic Resource
    Electronic Resource
    Constricted diamagnetic hysteresis loops observed for the high Tc superconductors (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4179-4181 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic hysteresis loops, ac susceptibility, and resistivity measurements have been made on a Ba2 YCu3 O7−x-type high- Tc superconductor. The shape of the hysteresis loops well below Tc are reminiscent of constricted hysteresis loops observed in certain ferromagnetic materials which are usually associated with magnetic aftereffects. Similar dynamic effects, with a time constant on the order of 10 s at 40 K, are shown to be present in the superconducting material. This dynamic magnetic viscosity effect is in addition to the flux creep observed for longer time periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341127
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  • 9
    Electronic Resource
    Electronic Resource
    Spin rotations in Ho"xEr"1"-"xFe"2 cubic laves compounds
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 37 (1976), S. 513-518 
    Details
    ISSN: 0022-3697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(76)90078-0
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  • 10
    Electronic Resource
    Electronic Resource
    Solid-state amorphization in Cu-Ho evaporated thin film multilayers
    Amsterdam : Elsevier
    Ultramicroscopy 17 (1985), S. 161 
    Details
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3991(85)90017-8
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