| 摘要 |
PURPOSE:To enable fabrication of an alloy target of low oxygen concentration and to improve a recording sensitivity without damaging reproducing characteristics by composing a part of rare earth elements which compose a thin film of an amorphous rare earth - transition metal alloy as a recording film out of light rare earth element. CONSTITUTION:A part of rare earth elements for composing a thin film of an amorphous rare earth - transition metal alloy as a recording film of a photomagnetic recording medium is composed of light rare earth element. The rare earth element (LR) is composed of at least one of the elements Ce, PR, Nd, and Sm. The transition metal (TM) and the rare earth element are composed of at least one of Fe, Co, and Ni, and Gd, Tb, and Dy, respectively. When a composition formula of the recording film is (LRxHR1-x)yTM100-y, 0.01<x<=0.60, 10<=y<=50. As the recording medium, aluminum nitride AlN 2, a recording layer 3, and an AlN film 4 are grown on a polycarbonate substrate 1 provided with grooves by spattering technique.
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