Thermally Assisted Magnetic Recording Using an Optical Head with NA=0.85(Selected papers from MORIS 2006 Workshop on Thermal & Optical Magnetic Materials and Devices)

概要

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Thermally assisted magnetic recording can solve fundamental problems with thermal fluctuation and write capability in magnetic recording. We built a dynamic write-read tester composed of a conventional spin stand and a recently designed magneto-optical (MO) head. We demonstrated the capability of writing small magnetic domains on TbFeCo recording media with a high coercive force (Hc) of 13 kOe by applying a small external field of less than 300 Oe. We also demonstrated a narrow track pitch (Tp) recording of less than 50nm using the light intensity modulation (LIM) method. Magnetic domains with both mark length (ML) and track pitch of 46nm, which correspond to an areal recording density of about 300 Gbit/in^2, were reproduced using a conventional giant magneto resistive (GMR) read head. These results indicate that narrow track pitch recording can be achieved by using thermally assisted magnetic recording.
2006-11-01