Magnetic media with atom implanted magnetic layer

Patent metadata

Field	Value
Publication number	US-9940963-B1
Application number	US-201615354980-A
Country	US
Kind code	B1
Filing date	Nov 17, 2016
Priority date	Nov 17, 2016
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A method for manufacturing a magnetic media for magnetic data recording that improves smoothness for reduced magnetic spacing, and also improves mechanical integration to improve reliability and lifespan of the data recording system. A magnetic material such as a magnetic recording layer is deposited over underlying layers that include a substrate. A first etching is performed that employs a Xe plasma. A second etching is then performed that employs an Ar plasma. The two step etching process advantageously improves smoothness of the surface of the magnetic layer which allows for a thinner overcoat for reduced magnetic spacing. The two step etching process also results in less head disk crashes, resulting in improved reliability.

First claim

What is claimed is:

1. A magnetic media for data recording, the magnetic media comprising:
a magnetic layer formed over a substrate; and
Ar and Xe atoms implanted into the magnetic layer, wherein a concentration of the Ar atoms is greater than a concentration of the Xe atoms.

2. The magnetic media as in claim 1 wherein the magnetic layer comprises a magnetic recording layer and a cap layer exchange coupled to the magnetic recording layer.

3. The magnetic media as in claim 1 further comprising a protective overcoat layer formed over the magnetic layer.

4. The magnetic media as in claim 3 wherein the protective overcoat layer comprises carbon.

5. The magnetic media as in claim 1 , wherein a surface of the magnetic layer has an average peak to valley roughness of less than 4.7 Angstroms.

6. A magnetic data storage system, comprising:
a housing;
a magnetic media held within the housing;
a slider; and
an actuator for moving the slider relative to a surface of the magnetic media, the magnetic media comprising:
a magnetic layer comprising Xe and Ar atoms implanted therein, wherein a concentration of the Ar atoms is greater than a concentration of the Xe atoms.

7. The magnetic data storage system as in claim 6 wherein the magnetic media further comprises a protective overcoat formed over the magnetic layer.

8. A method for manufacturing a magnetic media, the method comprising:
providing a substrate;
depositing a magnetic recording layer over the substrate;
performing a Xe etching process to implant Xe atoms in the magnetic recording layer; and
performing an Ar etching process to implant Ar atoms in the magnetic recording layer, wherein a concentration of the Ar atoms in the magnetic recording layer is greater than a concentration of the Xe atoms in the magnetic recording layer.

9. The method as in claim 1 , further comprising, after performing the Ar etching process, depositing a protective overcoat.

10. The method as in claim 9 , wherein the protective overcoat comprises carbon.

11. The method as in claim 1 , wherein the Xe etching process is performed before the Ar etching process.

12. The method as in claim 8 , wherein each of the Xe etching process and the Ar etching process is performed in a chamber with the substrate and the magnetic recording layer held on a chuck with application of a DC bias.

13. The method as in claim 12 , wherein the Xe etching process is performed by creating Xe plasma in the chamber and the Ar etching process is performed by creating an Ar plasma in the chamber.

14. The method as in claim 9 , wherein the Xe etching process, the Ar etching process, and the deposition of the protective overcoat are all performed in a common chamber.

15. The method as in claim 1 , wherein the Xe etching process is performed in a first chamber and the Ar etching process is performed in a second chamber.

16. The method as in claim 1 , wherein the Xe etching process comprises:
placing the substrate and the magnetic recording layer into a chamber;
inputting Xe gas into the chamber;
applying a DC voltage to the substrate and the magnetic recording layer; and
exciting a plasma in the chamber.

17. The method as in claim 1 , wherein the Ar etching process comprises:
placing the substrate and the magnetic recording layer into a chamber;
inputting Ar gas into the chamber;
applying a DC voltage to the substrate and the magnetic recording layer; and
exciting a plasma in the chamber.

18. The method as in claim 8 , wherein the magnetic recording layer is exchange coupled to a cap layer.

Assignees

• Western Digital Tech Inc

Inventors

• Tang Kai

Classifications

• G11B5/82

  Disk carriers · CPC title

• C23C14/48

  Ion implantation · CPC title

• G11B5/84

  Processes or apparatus specially adapted for manufacturing record carriers · CPC title

• G11B5/712

  characterised by the surface treatment or coating of magnetic particles · CPC title

• G11B5/65

  characterised by its composition (G11B5/66 takes precedence) · CPC title