| 摘要 |
<p>There is disclosed a multi-layer magnetooptical recording medium capable of overwriting with magnetic field modulation method, including: a first layer having perpendicular magnetic anisotropy and composed of a rare earth metal-transition metal alloy; and a second layer having perpendicular magnetic anisotropy and composed of a rare earth metal-transition metal alloy; wherein the Curie point of the second layer is lower than that of the first layer; the compensation temperature of the second layer is positioned between the room temperature and the Curie point thereof; the compensation temperature of the first layer is lower than that of the second layer; the product of saturation magnetic moment and coercivity of the first layer is smaller, at room temperature, than that of the second layer, and a certain relation exists, below the compensation temperature of the second layer, among the coercivities of the first and second layers, saturation magnetic moments of the first and second layers, thicknesses of the first and second layers, and exchange coupling force.</p> |
