Abstract

A promising approach to realize high capacity optical data storage is the use of domain expansion (DomEx) techniques like magnetic amplifying magneto optical system (MAMMOS). However, experiments show that correct readout of long mark domains (multiple bits) is critical and often even impossible, which means that the performance as a (random) data storage technology would be severely limited. Based on a detailed understanding of the MAMMOS readout process, these experimental results are explained and show excellent agreement with numerical simulations: the cause of the readout problems is a decrease in stray field in the centre of long magnetic domains. To solve this problem, write strategies can be applied, where small spaces with opposite magnetization direction are inserted at appropriate locations in each (long) mark domain. From the experimental and simulation results it is clear that this strongly improves the random data readout performance.

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