Enhancement in Magnetic Anisotropy for hcp-Structured Co Alloy Thin Films Through Pt Addition

Author

Shen, W.K. ; Das, Anirban ; Racine, Michael ; Cheng, Randy ; Judy, Jack H. ; Wang, Jian-Ping

Author_Institution

Dept. of Electr. & Comput. Eng., Minnesota Univ.

Volume

42

Issue

10

fYear

2006

Firstpage

2945

Lastpage

2947

Abstract

The addition effects of Pt in the (0002) Ru underlayer were studied. It was found that the lattice parameter can be tuned as desired through Pt addition in a (0002)-oriented Ru layer. The out-of-plane and in-plane lattice parameter of the RuPt can be increased by 2.3% and 0.44%, respectively. No phase segregation was apparently observed in RuPt films under these process conditions even with a very high Pt content (39%). The RuPt layer thus provides a good template layer to study the Pt addition effects in (0002)-textured hcp Co alloy perpendicular media with a very wide range of Pt content. CoCrPt-SiO₂ films were deposited with a Pt addition level varying from 15% to 40% on an optimally designed RuPt underlayer. The magnetic results showed that H_k,H_c,K_u reached a plateau at about 19%-23% Pt content. The maximum values for H _k,H_c, and K_u are 16.0 kOe, 6.6 kOe, and 3.1times10⁶ erg/cm³, respectively

Keywords

X-ray diffraction; chromium alloys; cobalt alloys; magnetic thin films; perpendicular magnetic anisotropy; platinum alloys; ruthenium alloys; silicon compounds; CoCrPt-SiO₂; Pt addition; RuPt; RuPt underlayer; X-ray diffraction; cobalt alloy; hcp-structured; magnetic anisotropy enhancement; magnetic thin films; perpendicular media; Anisotropic magnetoresistance; Cobalt alloys; Lattices; Magnetic anisotropy; Magnetic films; Manganese alloys; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Platinum alloys; X-ray scattering; Co alloy; CoCrPt–SiO; Pt addition; Ru underlayer; RuPt underlayer; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.878422

Filename

1704491