DocumentCode :
1449987
Title :
Si/NiFe/FeCoB Crystalline SUL to Reduce Ru Intermediate Layer Thickness for CoPtCr-SiO 
Granular Perpendicular Magnetic Recording Media
Author :
Matsuu, T. ; Hirata, K. ; Gomi, S. ; Hashimoto, A. ; Matsunuma, S. ; Inoue, T. ; Doi, T. ; Nakagawa, S.
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol., Tokyo, Japan
Volume :
45
Issue :
10
fYear :
2009
Firstpage :
3572
Lastpage :
3575
Abstract :
Bcc-FeCo (110) textured Ru/FeCoB films with high in-plane anisotropy field Hk were prepared as crystalline soft magnetic underlayers (SULs). The differences in crystallographic texture of the Ru intermediate layer (IML) and magnetic properties of Ru/CoPtCr-SiO2 films with or without a FeCoB crystalline SUL were investigated. Ru/CoPtCr-SiO2 films without Ru/FeCoB SULs exhibited a random orientation of Ru crystallites and in-plane magnetic anisotropy. On the other hand, Ru/CoPtCr-SiO2 films deposited on the Ru/FeCoB SULs exhibited (001) preferential orientations of the CoPtCr as well as the Ru IMLs and possessed perpendicular magnetic anisotropy. The reduction of the thickness of the Ru IML from 30 nm to 1 nm did not cause the degradation of integrated intensity of the CoPtCr (002) diffraction peak. The application of the Si/NiFe/FeCoB SUL improved the FeCo (110) crystalline orientation, compared to the Ru/FeCoB SUL, and promoted (001) crystalline orientation of the CoPtCr-SiO2 granular recording layer. The correlative relationship between Deltathetas50 of FeCo (110) texture and that of CoPtCr (002) texture was confirmed.
Keywords :
boron alloys; chromium alloys; cobalt alloys; crystallites; elemental semiconductors; ferromagnetic materials; granular materials; iron alloys; magnetic multilayers; magnetic thin films; metallic thin films; nickel alloys; perpendicular magnetic anisotropy; perpendicular magnetic recording; platinum alloys; ruthenium; silicon; silicon compounds; storage media; texture; CoPtCr (002) texture; SUL; Si-NiFe-FeCoB-Ru-CoPtCr-SiO2; bcc-FeCo (110) texture; crystalline soft magnetic underlayers; crystallites; crystallographic texture; granular recording layer; in-plane anisotropy field; magnetic properties; perpendicular magnetic anisotropy; preferential orientation; random orientation; ruthenium intermediate layer; Crystalline soft magnetic underlayer (SUL); FeCo(110); FeCoB SUL; Ru intermediate layer; crystalline orientation;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2009.2022498
Filename :
5257129
Link To Document :
