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    Direct overwrite in magnetooptical recording.

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    Author
    Watson, Mathew David.
    Issue Date
    1991
    Keywords
    Dissertations, Academic
    Optics
    Electrical engineering.
    Advisor
    Meystre, Pierre
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Direct overwrite in magneto-optical recording is necessary to overcome the latency incurred by conventional erase before write recording on magneto-optical disks. In this work we theoretically analyze the thermomagnetic recording process on optical disks using a domain wall motion model. The wall motion model developed in this work can be used to examine overwrite schemes on both bilayer and single layer disks, that either rotate beneath an optical head or remain stationary. The model is directly compared with experiment for a GdTbFe direct overwrite sample, and is shown to produce results that are in agreement with experimental observations. We show that variations in the domain wall saturation velocity can mean the difference between writing or erasing a bit on the disk, and hence is a critical parameter in the recording process. We also show that direct overwrite by means of interior nucleation is highly unlikely. Rather, we show that the recording process involves a dynamic balance between those pressures which act to move the domain wall and those which act to freeze it into place. Finally we analyze the Nikon bilayer direct overwrite scheme, and then demonstrate an alternative bilayer overwrite scheme which avoids a major problem with the Nikon scheme.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Optical Sciences
    Graduate College
    Degree Grantor
    University of Arizona
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    Dissertations

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