Thin film magnetic alloy having low noise, high coercivity and high squareness

USRE38544E1 · kind E1 · reissue

Assignee

• Komag, Inc. · US

Inventors

• Tu Chen · Monte Sereno, US
• Tsutomu Yamashita · San Jose, US
• Rajiv Yadav Ranjan · San Jose, US
• John Ko-Jen Chen · Los Gatos, US
• Keith Kadokura · Cupertino, US
• Ting Joseph Yuen · Fremont, US

Key dates

• Filing date: Jul 17, 2000
• Grant date: Jul 6, 2004
• Expiry date: Jul 17, 2020

Classification

• Technology area (CPC —): General

Abstract

A Co-Pt based magnetic alloy which has been doped with a relatively high amount of nitrogen, e.g., or above 1 at. % is obtained having high coercivity, for example in the range of 1400 Oe or above, and an increased signal-to-noise ratio as compared to the same Co-Pt based alloy which has not been doped with nitrogen. The alloy is vacuum deposited, for example, by sputtering, and the nitrogen may be introduced from the sputtering gas or from the sputtering target. Other low-solubility elements providing the grain uniformity and isolation include: B, P, S, C, Si, As, Se and Te.