F THE RESOLUTION Y MAMMOS

The MAMMOS (magnetic amplifying - System) read-out is achieved by applying an alternating external magnetic field for domain expansion and collapse processes. Since the read-out magnetic domain size is expanded by a magnetic field, a strong en~ancement in the amplitude of the read-out signal is expected. The read-out laser power dependence of the ~AMM~S signal was measured, and the resolution was estimated empirically. Applying an alternating magnetic field with suitable intensity, MAMMOS read- out was realized for a certain range of read-out laser power. The resolution and the margin of magnetic field depended on the laser power. Even at a 0.2 ,U m domain size, its signal was recognizable without interference at the optimum laser power. A C/N level of over 50 dB was obtained for a 0.2 ,U m domain size.