Magnetization Characteristics of Pre-Embossed Patterns on The Molded Plastic Rigid Disk

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  Pre-embossed rigid magnetic disks that we call PERM disk have been developed to realize high track density recording more than 5000 TPI. Pre-embossed servo patterns, which are magnetized with a 2-step magnetization method, are used as position signals. The PERM disk have realized to follow tracks less than 5 μm pitch using the position signals. It, however, has not been evidenced that a relationship between pre-embossed pattern shape and reproduced signal waveform. In this paper, we have investigated a relationship between the edge angle of pre-embossed patterns and waveform reproduced from magnetized patterns. The horizontal component length of the edge slope of pre-embossed patterns has played the effective magnetic transition length.

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