Title :
DyFeCo magnetooptical memory with reflective film structure
Author :
Ioth, Y. ; Takase, Takeo
Author_Institution :
Sharp Corp., Chiba, Japan
fDate :
7/1/1991 12:00:00 AM
Abstract :
The magnetic properties and magnetooptic effects of amorphous DyFeCo thin films with various compositions and thicknesses were investigated. The product of magnetization times coercive force of 15-30-nm-thick DyFeCo film gave a high value of 2.5-3 erg/cm3, comparable to that of Tb-enriched rare earth (RE) transition metal (TM) films. The dynamic characteristics of a quadrilayered magnetooptical disk having a reflective layer, i.e., carrier-to-noise ratio (C/N), optimum recording power and jitter were also evaluated. A high reproducing 60-dB C/N performance, comparable to that of Tb-enriched RE-TM films, was obtained by the 15-30-nm-thick DyFeCo films having a room temperature compensation composition. It is concluded that the use of this film is as efficient as the use of Tb films, while at the same time being much more inexpensive.
Keywords :
cobalt alloys; coercive force; dysprosium alloys; iron alloys; magnetisation; magneto-optical recording; 15 to 30 nm; DyFeCo amorphous thin films; Tb-enriched RE-TM films; carrier-to-noise ratio; coercive force; dynamic characteristics; magnetic properties; magnetization; magnetooptic effects; magnetooptical memory; optimum recording power; quadrilayered magnetooptical disk; rare earth transition metal films; reflective film structure; reflective layer; room temperature compensation composition; Amorphous materials; Coercive force; Disk recording; Jitter; Magnetic films; Magnetic properties; Magnetization; Magnetooptic effects; Magnetooptic recording; Optical films;
Journal_Title :
Magnetics, IEEE Transactions on
