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  • 1
    Electronic Resource
    Electronic Resource
    Alternating current susceptibility of a gadolinium crystal (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7028-7030 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The complex ac susceptibility of long bar-shaped crystals of gadolinium cut parallel or perpendicular to the c axis does not exhibit the expected divergence at the Curie point TC=293 K. However, χ′ does diverge to the demagnetization-limited value 1/N(approximate)70 at the spin reorientation transition temperature Tsr=225 K, where the first anisotropy constant K1 changes sign. The c-axis susceptibility χ(parallel)′(T) shows a step to reach a value of 10 at Tc which is essentially independent of measuring field in the ranges 10 Hz–1 kHz and 8–800 A/m. However, there is a peak in the perpendicular susceptibility χ⊥′(T) near TC, which reaches 45. A superimposed 50 Hz depinning field does not influence the ac response. It is proposed that gadolinium exhibits long-period sinusoidally modulated c-axis order below TC, analogous to that of erbium. The period of the modulation is estimated as 70 Å. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372920
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic evidence for structural-phase transformations in Fe-Co alloy nanocrystals produced by a carbon arc : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4039-4041 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In previously reported work FexCo1−x[C] (x=0.0, 0.2, 0.4, 0.5, 0.6, and 0.8 nominally) nanoparticles were prepared by a Kratschmer–Huffman carbon-arc method. Fe0.5Co0.5[C] exhibited the largest magnetizations heretofore observed in similarly produced nanoparticles. Here we present a more detailed study of the magnetic properties of Fe0.5Co0.5[C] nanocrystals. Magnetic hysteresis loops have been measured to temperatures exceeding 1050 K. This is attributed to rotational processes in monodomain particles and is shown to be sensitive to ordering of the particles. Low-field thermomagnetic data clearly show features which we attribute to the α→α′ disorder–order and α→γ phase transformations, respectively. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364887
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  • 3
    Electronic Resource
    Electronic Resource
    Distributed exchange interactions and temperature dependent magnetization in amorphous Fe88−xCoxZr7B4Cu1 alloys (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5130-5132 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the magnetization for Fe88Zr7B4Cu1 amorphous alloy has been measured. M(T) has been fit using a Handrich–Kobe model with a modified Brillouin function with an additional exchange fluctuation term. Here for the first time, an asymmetrical distribution of the exchange interactions is proposed based on empirical knowledge of the Bethe–Slater curve. A two-parameter exchange fluctuation is shown to give significantly better fits to M(T) for these amorphous alloys. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369100
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of Nb additions on the thermal stability of melt-spun Nd2Fe14B (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5926-5928 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Elevated-temperature superconducting quantum interference device (SQUID) magnetometry was performed on two samples of melt-spun and optimally annealed Nd2Fe14B; one sample contained 2.3 wt % Nb and one was Nb-free. Continuous full hysteresis loops were measured with a SQUID magnetometer at T=630 K, above the Curie temperature of the 2–14–1 phase, as a function of field (1 T≤H≤−1 T) and time on powdered samples sealed in quartz tubes at a vacuum of 10−6 Torr. The measured hysteresis signals were deconstructed into a high-field linear paramagnetic portion and a low-field ferromagnetic signal of unclear origin. While the saturation magnetization of the ferromagnetic signal from both samples grows with time, the signal from the Nb-containing sample is always smaller. The coercivity data are consistent with a constant impurity particle size in the Nb-containing sample and an increasing impurity particle size in the Nb-free sample. The paramagnetic susceptibility signal from the Nd2Fe14B-type phase in the Nb-free sample increases with time, while that from the Nb-containing sample remains constant. It is suggested that the presence of Nb actively suppresses the thermally induced formation of poorly crystallized Fe-rich regions that apparently exist in samples of both compositions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369916
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