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  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3648-3648 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optimization of magneto-optic media for data storage applications involves a detailed consideration of the impact of material properties on the overall performance and reliability characteristics of the complete media design, which includes both the active layer structure and the substrate material. Currently, the most highly developed materials for the active layer are the amorphous rare earth-transition metal (RE-TM) alloys. The RE-TM composition determines both the Curie temperature and the compensation temperature, both of which parameters affect the sensitivity, and therefore the data rate which can be achieved using currently available diode lasers. The thermal and optical characteristics of the active layer thin-film structure affect the sensitivity, and also determine the degree of enhancement of the shot-noise-limited SNR during playback. Reliability of magneto-optic media is affected by uniform surface oxidation of RE-TM alloys, which leads to reduced Kerr rotation through the formation of an absorptive surface layer with only in-plane anisotropy. The proper choice of dielectric passivation layers and deposition process can significantly limit this and other degradation mechanisms. The choice of substrate material must be compatible with the coating process for the active layer structure, provide a stable mechanical interface to the drive mechanisms, and also possess good optical properties, most notably low birefringence. This talk will review the current directions in materials research on magneto-optic media, and relate the physical characteristics of the materials involved to the major requirements of the data storage application.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3918-3918 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: At the present time, the two major approaches to reversible optical data storage are based on either the magneto-optic effect in rare-earth–transition-metal alloys, or on the amorphous-to-crystalline phase transition in a variety of tellurium-based materials. The phase transition approach is attractive because of the relatively large optical read-signal modulation which results. However, careful optimization of these materials is required to satisfy all of the requirements of data retention, fast erasure and a high number of record/erase cycles. The data retention characteristics and cyclability of magneto-optic storage media are not considered to be critical issues. However, the inherently small magnitude of the magneto-optic effect has led, historically, to relatively limited values for playback signal to noise ratio. Antireflective thin-film structures can be used to provide enhancements to the signal to noise ratio of magneto-optic media. The underlying principles and effect of such approaches to the design of magneto-optic media will be reviewed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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