| 摘要 |
PURPOSE:To improve S/N with an increased Kerr rotational angle for laser light, by providing an amorphous thin film of the rare-earth transition metal on a transparent base and a specific reflection film on said film. CONSTITUTION:In a magnetooptic storage element performing recording, reproduction and erasion of information by means of a laser light, a rare-earth transition metal amorphous thin film 2 having a magnetization easy axis vertical to a film such as GdTbFe, TbDyFe or GdDyFe is formed on a base 1 made of glass. At the back side of the film 2, a reflection film 3 made of Au, Ag or Cu in which the real part of a refractive index is <=1 and the imaginary part is -3--4, is provided. The beam made incident from the base 1 is reflected on the surface of the amorphous thin film 2 and the beam passing through the surface is reflected on the film 3. The two types of reflected lights are synthesized and added with Kerr effect and Farady effect to increase the apparent kerr rotational angle, allowing to improve the S/N of the obtained information. |
