Slider and/or hard disc including coating, and optionally one or more additives that can dissipate electrical charge

Patent metadata

Field	Value
Publication number	US-9508371-B2
Application number	US-201514704731-A
Country	US
Kind code	B2
Filing date	May 5, 2015
Priority date	May 6, 2014
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

The present disclosure relates to reducing a potential difference among a slider body and a hard disc drive platter by providing a hard disc drive platter and/or slider body with a coating that includes one or more additives that can dissipate electrical charge.

First claim

What is claimed is:

1. A hard disc drive comprising:
a) a hard disc drive platter having at least one major surface, wherein at least a portion of the major surface comprises at least one coating, wherein the coating comprises a lubricant comprising a perfluoropolyether in admixture with one or more additives that can dissipate electrical charge; and
b) a slider body having air bearing surface positioned to face the at least one major surface of the hard disc drive platter, wherein at least a portion of the air bearing surface comprises:
i) a carbon overcoat surface; and
ii) a surface coating layer overlying the carbon overcoat surface, wherein the surface coating layer has a thickness of from greater than zero to 50 angstroms, wherein the surface coating layer comprises an organosilane compound having a functional group selected from the group consisting of a halogen group, an alkyl group, an amine group, a silicon dioxide group, and combinations thereof.

2. The hard disc drive of claim 1 , wherein a surface of the lubricant coating has been treated with the one or more additives that can dissipate electrical charge.

3. The hard disc drive of claim 2 , wherein a surface of the lubricant coating has been sprayed with the one or more additives that can dissipate electrical charge.

4. The hard disc drive of claim 1 , wherein the lubricant has a thickness in the range from greater than 0 to 50 angstroms.

5. The hard disc drive of claim 1 , wherein the at least one coating comprises a self-assembled monolayer.

6. The hard disc drive of claim 5 , wherein the at least one coating comprises the self-assembled monolayer in admixture with the one or more additives that can dissipate electrical charge.

7. The hard disc drive of claim 5 , wherein a surface of the self-assembled monolayer has been treated with the one or more additives that can dissipate electrical charge.

8. The hard disc drive of claim 7 , wherein a surface of the lubricant coating has been sprayed with the one or more additives that can dissipate electrical charge.

9. The hard disc drive of claim 5 , wherein the self-assembled monolayer has a thickness in the range from 1 to 100 angstroms.

10. The hard disc drive of claim 1 , wherein the one or more additives are chosen from antistatic agents, conductive polymers, conducting polymer nanofibers, antioxidants, and combinations thereof.

11. The hard disc drive of claim 1 , wherein the organosilane compound is selected from the group consisting of alkyl trichlorosilane, fluorinated alkyl trichlorosilane, alkyl trialkyloxysilane, fluorinated alkyl trialkyloxysilane, and per-fluoro-decyl-trichlorosilane.

12. The hard disc drive of claim 1 , wherein the surface coating layer further comprises a chemical additive that can dissipate electrical charge, wherein the chemical additive is selected from the group consisting of antistatic agents, conductive polymers, conducting polymer nanofibers, antioxidants, and combinations thereof.

13. A hard disc drive comprising:
at least one hard disc having at least one major surface, wherein at least a portion of the major surface comprises at least one coating, wherein the coating comprises a lubricant comprising a perfluoropolyether in admixture with one or more additives that can dissipate electrical charge;
at least one slider body corresponding to each hard disc, wherein the slider body comprises:
an air bearing face, wherein the air bearing face comprises a leading edge, a trailing edge, and an air bearing surface, wherein at least a portion of the air bearing surface comprises:
a) a carbon overcoat surface; and
b) at least one self-assembled monolayer overlying the carbon overcoat surface, wherein the monolayer has a thickness of from greater than zero to 50 angstroms, wherein the monolayer comprises an organosilane compound having a functional group selected from the group consisting of a halogen group, an alkyl group, an amine group, a silicon dioxide group, and combinations thereof;

at least one side face; and
a trailing edge face that is adjacent to the trailing edge of the air bearing face, wherein the potential difference between the at least one hard disc and the corresponding at least one slider body is 700 mV or less.

14. The hard disc drive of claim 13 , further comprising a bias voltage source in electrical communication with the at least one hard disc or the at least one slider body, wherein the bias voltage source can apply a predetermined bias voltage to help reduce a potential difference among the at least one hard disc and the at least one slider body.

15. A method of reducing a potential difference among an air bearing surface of a slider body and a hard disc drive platter comprising providing a hard disc drive platter having at least one major surface, wherein at least a portion of the major surface comprises at least one coating, wherein the coating comprises a lubricant comprising a perfluoropolyether in admixture with one or more additives that can dissipate electrical charge, wherein the air bearing surface comprises a carbon overcoat surface and a surface coating layer overlying the carbon overcoat surface, wherein the surface coating layer has a thickness of from greater than zero to 50 angstroms, wherein the surface coating layer comprises an organosilane compound having a functional group selected from the group consisting of a halogen group, an alkyl group, an amine group, a silicon dioxide group, and combinations thereof.

16. The method of claim 15 , further comprising:
providing a bias voltage source in electrical communication with the hard disc drive platter or the slider body; and
applying a predetermined bias voltage to help reduce a potential difference among the hard disc drive platter and the slider body.

Assignees

• Seagate Technology Llc

Inventors

• Stoebe Tim
• Olson Dan

Classifications

• G11B5/6094

  Preventing or discharging electrostatic charge build-up on the flying head · CPC title

• G11B5/72

  Protective coatings, e.g. anti-static {or antifriction} · CPC title

• G11B5/725

  containing a lubricant {, e.g. organic compounds (inorganic carbon protective coating G11B5/727)} · CPC title

• G11B5/60 Primary

  Fluid-dynamic spacing of heads from record-carriers · CPC title

• G11B5/6082

  Design of the air bearing surface · CPC title