Magnetic recording media having five element alloy deposited using pulsed direct current sputtering
US7504166B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 2004 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Jul 7, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/851
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
CoCrPtB is a conventional material used in some of the layers of a thin film magnetic media structure used for recording data in data storage devices such as hard drives. Typically the CoCrPtB layers used for magnetic media have high Cr and low B in bottom magnetic layers and low Cr and high B in top magnetic layers. In accordance with one embodiment of this invention and to improve media electrical performance, fifth elements, such as Ta, Nb and Hf, etc. were added to the CoCrPtB materials, resulting in CoCrPtB—X, to enhance the grain segregation. The five element CoCrPtB—X layers were deposited using a pulsed direct current sputter technique instead of conventional direct current sputtering techniques. The resulting magnetic media structure having CoCrPtB—X alloy layers exhibits an increase in coercivity Hc and improvement in recording performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.