MAMMOS Readout With Magnetic Field Modulation

MAMMOS (Magnetic AMplifying Magneto-Optical System) is one of the highest density readout methods for storage media. The signal is directly amplified on the medium and its amplitude is just the same as that from a long domain. Even at a 0.04 μm domain, the signal was large enough. At a 0.2 μm packed domain, CNR was more than 50 dB and BER was in the 10-4 range. By employing a MAMMOS readout with magnetic field modulation (MFM-MAMMOS), the signals have both very high resolution and large amplitude characteristics.