Hiroshi Shirai

Magnetic domain expansion readout for amplification of an ultra high density magneto‐optical recording signal

An amplified magneto‐optical signal readout by using a dynamic domain expansion effect has been proposed and experimentally confirmed. Small domains of around 0.3 μm in diameter were expanded by a pulsed external field on the readout layer copied from the recording layer. An amplified readout signal up to three times larger than that of the original one has been achieved.

Magnetic AMplifying Magneto-Optical System (MAMMOS) for ultra high density MO recording

A readout method to amplify the MO signal by using a magnetic domain expansion phenomenon has been proposed and results shown. It was found that the small MO signal reproduced from the small recorded domain was amplified. This novel magnetic domain expansion read out technique shows high promise for future data storage technology.