| 摘要 |
PURPOSE:To obtain a photomagnetic recording medium which has a large Faraday effect and Kerr effect and has consequently a large reproduction SN ratio by adding Ga, Pt, Pd and Rh into an amorphous rare earth-transition metal alloy layer having uniaxial magnetic anisotropy. CONSTITUTION:The alloy layer having the desired vertical magnetic anisotropy has the compsn. expressed by the formula and is formed by providing the amorphous layer 2 contg. Tb, Fe and 1 kind among Ga, Pt, Pd and Rh on a glass substrate 1. The amorphous alloy layer except the layer added with Ga is formed by arraying the pellets of Tb and one kind among Pt, Pd and Rh on a disk target of Fe and forming the film by an RF sputtering method. The Ga- added amorphous alloy layer is formed by arraying the pellets of Tb and Fe on the disk target of Fe7Ga3 and forming film similarly by the sputtering method. The figure shows that the change in the reproduction SN ratio of the recording layer consisting of the amorphous alloy layer owing to the Kerr effect with respect to the content (y) of Ga, Pt, Pd and Rh is increased by max. 30% with Ga by the addition of Ga, Pt, Pd and Rh and is increased by about 40% with Pt and by about 5% with Pd and Rh. |
