Title :
Magneto-optical properties of (Pr,Nd)-(Tb,Dy)-FeCo amorphous films
Author :
Nakada, M. ; Yokota, H. ; Yumoto, S. ; Okada, O. ; Gokan, H.
Author_Institution :
NEC Corp., Kawasaki, Japan
fDate :
9/1/1989 12:00:00 AM
Abstract :
A systematic study of magnetooptical properties for four different varieties of the (Pr,Nd)-(Tb,Dy)-FeCo system, focusing on temperature and wavelength dependences of Kerr rotation θk for alloy films and multilayered films, was made. The same relation between Curie temperature Tc and θk at a 830-nm wavelength was obtained for (Pr,Nd)-(Tb,Dy)-FeCo and (Tb,Dy,GdTb)-FeCo alloy films where the Co to FeCo ratio was less than 20 at.%. It was found that in the range of 500 nm to 900 nm the absolute magnitude of θk for all quaternary systems was always less than that for Dy-FeCo. These results suggest that amorphous rare-earth-FeCo alloy films containing Nd or Pr are not superior to (Tb,Dy)-FeCo films in regard to recording sensitivity and recording density in magnetooptical disks. On the other hand, θk enhancement was observed for Nd-Dy-FeCo multilayered films. This θk enhancement is not caused by the addition of Nd, but is due to the effect of film microstructure on θk
Keywords :
Curie temperature; Kerr magneto-optical effect; cobalt alloys; dysprosium alloys; iron alloys; magnetic properties of amorphous substances; magnetic thin films; magneto-optical recording; neodymium alloys; praseodymium alloys; terbium alloys; 500 to 900 nm; Curie temperature; DyFeCo; GdTbFeCo; Kerr rotation; NdDy-FeCo; NdDyFeCo; PrDyFeCo; PrTbFeCo; TbFeCo; amorphous films; film microstructure; magnetooptical disks; magnetooptical properties; multilayered films; recording density; recording sensitivity; temperature dependence; wavelength dependences; Amorphous materials; Cobalt alloys; Disk recording; Magnetic films; Magnetic properties; Magnetooptic effects; Neodymium; Perpendicular magnetic anisotropy; Sputtering; Substrates;
Journal_Title :
Magnetics, IEEE Transactions on
