Journal of the Magnetics Society of Japan
Online ISSN : 1880-4004
Print ISSN : 0285-0192
ISSN-L : 0285-0192
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Volume 21, Issue 8
Displaying 1-3 of 3 articles from this issue
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Contributed Paper
  • Magnetically Induced Superresolution Magneto-Optical Disk Using an In-Plane Magnetization Mask Layer
    J. Hirokane, A. Takahashi
    1997 Volume 21 Issue 8 Pages 1076-1081
    Published: 1997
    Released on J-STAGE: August 20, 2007
    DOIhttps://doi.org/10.3379/jmsjmag.21.1076
    JOURNAL OPEN ACCESS
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    A high-density magneto-optical disk was realized through the use of center aperture detection (CAD), a magnetically induced superresolution (MSR) readout method, employing the magnetostatic coupling force. In this investigation, an in-plane magnetization mask layer having a low Curie temperature was formed over the readout layer of CAD. The in-plane magnetization mask of the readout layer was strengthened by the exchange coupling force between the readout layer and the in-plane magnetization mask layer. The use of the latter layer made it possible to obtain higher resolution.
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  • Influence of the Cooling Rate on the Surface Crystallization and the Magnetic Properties of Fe-Based Amorphous Alloy Ribbons with Al and Ti Impurities
    H. Sawairi, M. Fujikura, T. Sato
    1997 Volume 21 Issue 8 Pages 1082-1087
    Published: 1997
    Released on J-STAGE: August 20, 2007
    DOIhttps://doi.org/10.3379/jmsjmag.21.1082
    JOURNAL OPEN ACCESS
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    Fe-based amorphous alloys containing Al and Ti as impurities become surface-crystallized during casting, with a resultant deterioration in their soft magnetic properties. This study shows that the surface crystallization is accelerated by decreasing in the quenching rate, and that there are big differences in the crystallization behavior between Al and Ti. It is found that the magnetic properties are governed not by the morphology of the crystallites formed, but by the thickness of the crystalline layers in which the crystallites are distributed.
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  • Phase Separation and Magnetism of Highly Resistive Magnetic Films with Hetero-granular Structures
    K. Kato, Y. Takeno, O. Kitakami, Y. Shimada
    1997 Volume 21 Issue 8 Pages 1088-1093
    Published: 1997
    Released on J-STAGE: August 20, 2007
    DOIhttps://doi.org/10.3379/jmsjmag.21.1088
    JOURNAL OPEN ACCESS
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    The relationship between magnetic softness and the precipitation process of highly resistive soft magnetic TM-M-X [TM: Fe, Co, M: Metal, X: O, N] films was investigated.The as-sputtered and incompletely phase-separated state of Fe-Al-O, Fe-Sm-O, and Fe-V-O films show magnetic softness. This soft magnetic property is attributed to the exchange coupling of neighboring magnetic crystals through the intergranular phase. However, Fe-B-N and Co-Sm-O films show perpendicular anisotropy over the whole annealing temperature range, because it is easy to separate TM-X and M-X owing to their extremely high diffusion rate and the large difference between their Gibbs free energies (−ΔG°diff). These results indicate that the small diffusion coefficient of M and X in TM (D), the large critical radii of crystal nucleation of M-X compounds (r*), the high melting points of M-X compounds (Tm) and the large −ΔG°diff. are essential factors in the formation of stable hetero-granular structures with both magnetic softness and high resistivity.
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