Effect of Pt seed on magnetic properties of Co-Pt alloy deposited into aluminum oxide pores

Author

Shiomi, Shigeru ; Nishii, Toshiki ; Kohama, Hiroyuki

Author_Institution

Dept. of Electr. & Electron. Eng., Mie Univ., Tsu, Japan

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2568

Lastpage

2570

Abstract

We have deposited a Co-rich hcp Co-Pt alloy into aluminum oxide pores by applying pulse voltage. The Co content in Co-Pt alloy increased with increasing pulse voltage, which was 95% at 7 V. We found that the Pt seed remarkably enhances the perpendicular anisotropy, thus increasing the squareness and coercivity of the perpendicular magnetization curve. The Co-Pt alloy on the Pt seed is randomly oriented, hardly affecting the perpendicular anisotropy due to the shape effect. However, without the Pt seed, the magnetocrystalline anisotropy of the hcp Co-Pt alloy reduces the shape anisotropy significantly. We also found that the Pt seed greatly reduces the amount of Co-Pt alloy deposited.

Keywords

alumina; cobalt alloys; coercive force; electrodeposition; ferromagnetic materials; magnetic thin films; perpendicular magnetic anisotropy; platinum alloys; 7 V; Co content; Co-Pt; Co-Pt alloy; Co-rich hcp Co-Pt alloy; CoPt-Al₂O₃; Pt; Pt seed; aluminum oxide pores; coercivity; magnetic properties; magnetocrystalline anisotropy; perpendicular anisotropy; perpendicular magnetization curve; pulse voltage; randomly oriented Co-Pt alloy; shape effect; squareness; Aluminum alloys; Aluminum oxide; Anisotropic magnetoresistance; Cobalt alloys; Coercive force; Magnetic properties; Magnetization; Platinum alloys; Shape memory alloys; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801954

Filename

1042269