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  • 1
    Electronic Resource
    Electronic Resource
    High-field magnetization process in Sm2Fe17N3.0: Importance of exchange-enhanced mixing of excited J multiplets : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6931-6933 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The high field magnetization process in Sm2Fe17N3.0 has been investigated by using dc magnetic fields of up to 260 kOe generated by a hybrid magnet. It was found that the hard-axis magnetization at 4.2 K is only 78% of the easy-axis value in the field of 260 kOe, while at 296 K, it almost saturates at the same field, the saturation value being about 3% smaller than that along the easy axis. Experimental results have been analyzed on the basis of a model calculation taking the excited J multiplets of the Sm ion into account. It has been found that, when the field is applied along the hard axis at 296 K, the Sm magnetic moment rotates away from the field direction and finally, at the saturation field, it becomes antiparallel to the field so that the Sm and Fe moments are arranged ferrimagnetically. The origin of such a magnetization process was clearly explained as a result of the mixing of the excited J multiplets caused by the Sm–Fe exchange interaction. Observed anisotropy of saturation magnetization at 296 K was thus attributed primarily to this field-induced ferrimagnetic structure in the hard direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352438
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  • 2
    Electronic Resource
    Electronic Resource
    High-resolution neutron powder diffraction study on nitrogenated Nd2Fe17 : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6032-6034 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-resolution neutron powder diffraction measurements with λ=1.8232 A(ring) and collimation of 6'-20'-6' on Nd2Fe17Nx with x=0, 2.85, and 2.91 were carried out at room temperature. Structural parameters and magnetic moments were determined by the Rietveld profile-fitting calculation. The magnetic moments of iron atoms increased with increasing nitrogen concentration; e.g., the magnetic moments of iron located at 6c, 9d, 18f, and 18h sites increase from less than 0.7μB in the x=0 sample to about 2.1μB in the x=2.91 sample. It is noticed that a local atomic group composed of two Fe(1) atoms at the 6c site plus six Fe(3) atoms at the 18f site keeps its shape against the nitrogen uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353460
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  • 3
    Electronic Resource
    Electronic Resource
    Susceptibility and magnetization processes in Sm2Fe17N3 powders (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6385-6390 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low field ac susceptibility and magnetization curves of milled Sm2Fe17N3 powders are measured for isotropic and aligned samples with average particle sizes ranging from 3.0 to 52 μm. Most of the particles are in a multidomain state before application of a magnetic field. The transverse ac susceptibility (χ⊥ac∼0.08) due to magnetization rotation against the anisotropy field is independent of particle size. The parallel ac susceptibility χ(parallel)ac and the susceptibility of isotropic powders are dominated by almost free domain wall movement in multidomain particles for which 〈χ〉=1.35. In very low fields (〈0.5 mT) χ(parallel)ac is small (∼0.1), but it increases toward a constant value of order 1 when the field exceeds a value of order 1 mT which is inversely proportional to the particle size. There is a corresponding increase in loss angle which is attributed to weak pinning of domain walls at surface defects. The volume fraction of single-domain and multidomain powder are deduced as a function of average particle size both in the unmagnetized and remanent states, from an analysis of high-field magnetization curves on isotropic powder. For example, about 87% of the volume of powder with an average size of 6.7 μm is multidomain in the unmagnetized state, but only 43% of the volume is multidomain in the remanent state. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363638
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