PURPOSE: To improve a coercive force and residual magnetization quantity by forming the magnetic layers of the magnetic recording medium of alloys consisting of specific compds.
CONSTITUTION: The plural magnetic layers laminated on a nonmagnetic sub strate 1 are formed of one or ≥2 kinds of alloys selected from a group consisting of Co-Cr-Ta, Co-Cr-Hf, Co-Cr-Zr. These magnetic layers 3, 5, 7, 9 are alternately laminated with a 1st Cr layer 2, a 2nd Cr layer 4, a 3rd Cr layer 6 and a 4th Cr layer 8. Since plural layers of the magnetic layers are laminated by inserting Cr layers as underlying layers between these layers and, therefore, the residual magnetization quantity is equal to the residual magnetization quantity of the single magnetic layer having the thickness corre sponding to the sum of the thicknesses of the plural magnetic layers even if the thicknesses of the respective magnetic layers are reduced so as to obtain the sufficiently high coercive force. The hysteresis curve which is high in both of the coercive force and the residual magnetization quantity and is clean even if the Cr layers are relatively thin, is therefore, obtd.
SUENAGA TADATOSHI
MIZUSHIRI MASAYUKI
| JPS63244309A | 1988-10-11 |