Claims
- 1. A reader of a magnetoresistive head of a magnetic data storage and retrieval system, the reader comprising:a magnetoresistive element having a width of about 0.1 microns to about 4.0 microns; and means for detecting locations of mechanical asperities to prevent data storage at those locations, the means having an effective width of about 10 microns to about 100 microns.
- 2. A reader of a magnetoresistive head of a magnetic data storage and retrieval system, the reader comprising:a magnetoresistive read element having a width of about 0.1 microns to about 4.0 microns; a non-magnetic wide detection element for use in detecting locations of mechanical asperities to prevent data storage at those locations, the non-magnetic wide detection element having a width of about 10 microns to about 100 microns; a spacer positioned between the magnetoresistive read element and the non-magnetic wide detection element; and a plurality of electrical contacts connecting the magnetoresistive read element and the non-magnetic wide detection element to external circuitry.
- 3. The reader of claim 2 wherein the spacer in an insulator.
- 4. The reader of claim 2 wherein the spacer is formed from aluminum.
- 5. The reader of claim 2 wherein the non-magnetic wide detection element is formed from a metal substance.
- 6. The reader of claim 2 wherein the non-magnetic wide detection element is formed from nickel.
- 7. The reader of claim 2 and further comprising:a bias layer for biasing a magnetization property of the magnetoresistive read element; and a spacer layer positioned between the magnetoresistive read element and the bias layer.
- 8. The reader of claim 2 and further comprising:a plurality of nickel-iron layers separated by a plurality of gap layers positioned between the magnetoresistive read element and the non-magnetic wide detection element.
- 9. The reader of claim 2 wherein the non-magnetic wide detection element is positioned in closer proximity to the magnetic media than the magnetoresistive read element is positioned to the magnetic media.
- 10. The reader of claim 2 wherein a bias current provided through the non-magnetic wide detection element is greater than a bias current provided through the magnetoresistive read element.
- 11. A method for preventing magnetic data storage at locations on a magnetic media containing a mechanical asperity, the method comprising:using a transducing head to scan a surface of a magnetic media to detect locations of mechanical asperities, the transducing head comprising a magnetoresistive read element and a wide detection element, the magnetoresistive read element having a width of about 0.1 microns to about 4.0 microns and the wide detection element having a width of about 10 microns to about 100 microns; providing a magnetoresistive read element bias current through the magnetoresistive read element; providing a wide detection element bias current through the wide detection element, the wide detection element bias current being greater than the magnetoresistive read element bias current; and mapping and recording the locations of detected mechanical asperities.
Parent Case Info
This application is a Section 371 national phase application from PCT International Application No. PCT/US98/18385, filed Sep. 4, 1998, which claims priority from U.S. Provisional Application No. 60/058,237, file Sep. 8, 1997.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/JP98/18385 |
|
WO |
00 |
11/2/1998 |
11/2/1998 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO99/13459 |
3/18/1999 |
WO |
A |
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5270892 |
Naberhuis |
Dec 1993 |
|
5793207 |
Gill |
Aug 1998 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
8-287444 |
Nov 1996 |
JP |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/058237 |
Sep 1997 |
US |