“…Fortunately, in a magnetooptical (MO) system, it is possible to record marks smaller than the laser spot diameter by a laser-pumped magnetic field modulation (LP-MFM) method. 1,2) In addition, various readout technologies have been developed, such as magnetically induced super resolution (MSR), 3) magnetic amplifying magnetooptical system (MAMMOS) 4) and domain wall displacement detection (DWDD), 5) for reading marks smaller than the laser spot diameter.…”