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  • American Institute of Physics (AIP)  (2)
  • 1985-1989  (2)
  • 1975-1979
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  • 1
    Electronic Resource
    Electronic Resource
    Dynamical susceptibility of Ho2Fe14B single crystal: Spin rotation and domain wall motions (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5534-5536 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The complex ac magnetic initial susceptibility (χ=χ'−jχ‘) has been measured along the [100], [110], and [001] directions from 4.2 to 300 K. Along the two basal directions the spin-reorientation phase transition (SRT) is detected at TS =57.8 K as an abrupt steplike anomalous decrease in χ' for increasing temperature. The value of the experimental ratio χ'[110]/ χ[100] (approximately-equal-to)2 holds for T≥TS. The reversible magnetic moment rotation set on by the exciting ac magnetic field explains these results, allowing a fit from which the stress constant σ=42±1 kg/mm2 is derived. Along the [001] direction no anomaly in χ'(T) is detected at TS while a strong continuous increase is manifest above 150 K. It is explained by the onset of narrow wall motions between 180° domains induced by thermal excitations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342327
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  • 2
    Electronic Resource
    Electronic Resource
    Spin rotation in R2Fe14BHx (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3565-3567 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied by 57Fe Mössbauer spectroscopy and low field magnetization on oriented powders the temperature and hydrogen dependence of the magnetic structure of R2Fe14B compounds with R=Dy, Ho, and Y. We show that the iron sublattice may be canted by an angle (approximately-equal-to)15° at high temperature. Hydrogen increases this canting at low temperature. It increases the spin reorientation temperature measured by bulk magnetization for Ho2Fe14B and induces a spin reorientation in the Dy alloys. These effects show that the strength of the crystal field terms of fourth (and maybe sixth) order compared to the terms of second order is increased by hydrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338727
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