Method of making a read head with high resistance soft magnetic flux guide layer for enhancing read sensor efficiency
US6223420A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1998 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Dec 4, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49046
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A read head has a flux guide layer that is immediately adjacent (abuts) the back edge of a read sensor. The flux guide layer is made of a high resistance soft magnetic material that conducts magnetic flux from the back edge of the read sensor so that the magnetic response at the back edge of the read sensor is significantly higher than zero. This increases the efficiency of the read sensor. The material for the flux guide layer is A-B-C where A is selected from the group Fe and Co, B is selected from the group Hf, Y, Ta and Zr and C is selected from the group O and N. In a preferred embodiment A-B-C is Fe--Hf--O and the M.sub.s.rho. of the flux guide layer is greater than 50 times the M.sub.s.rho. of the read sensor layer where the read sensor layer is NiFe, M.sub.s is saturation magnetization and .rho. is resistivity. Because of the flux guides high resistance current shunting losses are nearly eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.