The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2001
Filed:
Jul. 20, 1999
Billy W. Crue, Jr., San Jose, CA (US);
Renuka Apparao, Fremont, CA (US);
Zhupei Shi, San Jose, CA (US);
Sean Yao, Milpitas, CA (US);
Read-Rite Corporation, Fremont, CA (US);
Abstract
A magnetoresistive write element having a greatly reduced stack height allowing construction of a smaller track width and tighter track width tolerances. The reduced stack height also produces improved magnetic flux flow properties in the write element leading to an improved magnetic fringing field in the write gap region The magnetoresistive write head includes an electrically conductive planar coil having a portion thereof extending between first and second poles. The first and second poles join one another to form a magnetic yoke which is closed at one end and open at the other. An insulation layer separates the coil from the first pole. Another layer of insulating material is formed into the coil, interspersed between the winds and having an upper surface which is flush with the upper surface of the coil. A thin layer of write gap material insulates the coil from the second pole. Since there is only a thin layer of write gap material between the coil and the second pole, rather than a thicker insulation layer, the topography of the second pole can be reduced. This lowers the stack height which allows the second pole to be constructed to define a smaller write gap with tighter tolerances.