The magnetic printing method, which can duplicate soft magnetic patterns containing digital information such as servosignals formed on a master disk onto recording media, enables signals to be written to hard-disk media having high coercivities above 6000 Oe. We propose the application of the magnetic printing method to a hard-disk medium having double recording layers, one layer of which has high coercivity and is to be printed with digital information. This double recording layer medium is a hard-disk medium that has a magnetic read-only-memory (MROM) layer. In this study, we demonstrated a method for printing to this medium, which has MROM, and discussed the magnetic properties and recording performances of this medium.

No abstract

Ab&rict-The pyro photosensor PPS with 1.0 pm-thickness is a device utilizing the magnetic property of the thermallysensitive ferri magnetic thin film with low Curie temperature. The conventional photo-magnetic semiconductor using a thick film with 55 vm-thickness has a slow response and a large size, while the PPS is characterized by 21 quick pulse response and a high sensitivity. When light is radiated to the PPS, the PPS iibsorbs light energy which causes the reluctance change to the PPS. The reluctance change can be read out by a magnetoresistance element and it is converted into voltage of which the peak value grows with an increase in illuminance. The PPS is useful as a magnetic sensor instead o f the electric photo sensors.Index Term-Magnetoresistance element, photosensor, pyromiignetic effect, thermally-sensitive magnetic thin film.

No abstract

No abstract