Abstract
MAMMOS (Magnetic Amplifying Magneto-Optical System) is a technology for reproducing a large signal during MO readout from a small magnetic domain. It has hitherto been considered that the domain recorded on the recording layer is copied to and expanded on the readout layer by irradiating the readout layer with a laser beam and applying a perpendicular magnetic field. However, we discovered that it is very effective for readout of small magnetic domains to apply an in-plane magnetic field. Under conditions where λ = 635 nm and NA = 0.55, the bit error rate (BER) of 0.15μm packed domains was improved to 2×10-4, while the BER of 0.2 μm packed domains was 2 × 10-4 when an in-plane magnetic field was not applied.
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