Abstract
Previously we reported that it is possible to record information by means of magnetic holography (using amorphous TbFe thin films as a hologram medium) onto a spot whose diameter is less than 1 mm and to reconstruct it by using the Faraday effect. However, we had not studied the basic characteristics for information storage in detail, and therefore did not then have a proper way of making good holograms reproducibly. Because reproducibility is the most important characteristic for recording, we studied the recording margin for information storage by magnetic holography. In addition, we discussed the relationship between the power density of two beams (object beam and reference beam) and the domain pattern (hologram). It was confirmed that the domain pattern has a close relation to the beam density, and the recording margin depends on the information pattern. From these results, we can make a good hologram reproducibly.
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