抄録
Magnetic garnet films of (YBi)3(FeGa)5O12 and (YSm)3(FeGa)5O12 systems were prepared for magnetic transcription use. Films with the specific Faraday rotation up to 104 deg/cm, the squareness up to 1 and the saturation field down to 2 Oe can be produced by varying the thickness from 0.5 μm to 9 μm and the saturation magnetization from 6 G to 220 G. Amorphous Dy-Fe films were deposited directly on the garnet films to make composite films. Thermomagnetically induced domains in the former were examined as the transcripted domains in the latter, where the magneto-optical contrast was much improved due to the one order higher Faraday rotation of the latter than the Kerr rotation of the former. High quality of transcription without bias field can be attained only by the garnet films of large squareness. These results show that the composite films is a good candidate medium for thermomagnetic memory systems.
