Title :
Pyro photosensor utilizing thermally-sensitive magnetic thin film
Author :
Yoshida, T. ; Ajishi, Y. ; Osada, H. ; Chiba, S. ; Tayama, N. ; Seki, K. ; Matsuki, H.
Author_Institution :
Dept. of Electr. & Electron. Eng., Iwate Univ., Morioka, Japan
fDate :
7/1/1998 12:00:00 AM
Abstract :
The pyrophotosensor PPS with 1.0 μm-thickness is a device utilizing the magnetic property of a thermally-sensitive ferrimagnetic thin film with low Curie temperature. The conventional photomagnetic semiconductor using a thick film with 55 μm-thickness has a slow response and a large size, while the PPS is characterized by a quick pulse response and a high sensitivity. When light is radiated to the PPS, the PPS absorbs light energy which causes the reluctance change to the PPS. The reluctance change can be read out by a magnetoresistive 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 as an alternative to electric photosensors
Keywords :
Curie temperature; ferrites; magnetic sensors; magnetic thin films; magnetocaloric effects; manganese compounds; photodetectors; zinc compounds; 1.0 mum; Curie temperature; MnZnFe2O4; magnetoresistive element; pyrophotosensor; reluctance change; sensitivity; thermally-sensitive ferrimagnetic thin film; Magnetic circuits; Magnetic films; Magnetic flux; Magnetoresistance; Optical reflection; Saturation magnetization; Temperature dependence; Temperature sensors; Thick films; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
