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Spatial resolution of domain copying in a magnetic domain expansion readout disk

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7 Author(s)
P. W. M. Blom ; Philips Res. Lab., Eindhoven, Netherlands ; J. J. L. Horikx ; P. J. H. Bloemen ; C. A. Verschuren
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In a magnetic amplifying magnetooptical system (MAMMOS) disk, the copying process of a magnetic domain from the recording layer into the readout layer is investigated by using a laser spot diameter of 0.66 μm. Interference between neighboring bits occurs when the spatial resolution of the copy process is larger than half the domain size. It is observed that a reduction of the readout power from 2.3 to 2.0 mW corresponds to a decrease of the copy window from 0.5 to 0.06 μm. As a result, at 2.0 mW packed magnetic domains with a width of only 0.11 μm have been resolved without interference by using domain expansion

Published in:

IEEE Transactions on Magnetics  (Volume:37 ,  Issue: 5 )