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

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

3767

Lastpage

3769

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 θ_k for alloy films and multilayered films, was made. The same relation between Curie temperature T_c and θ_k 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 θ_k 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, θ_k enhancement was observed for Nd-Dy-FeCo multilayered films. This θ_k enhancement is not caused by the addition of Nd, but is due to the effect of film microstructure on θ_k

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42427

Filename

42427