Perpendicular write head with independent trailing shield designs

US7894159B2 · kind B2 · utility

Assignee

• Hitachi Global Storage Technologies Netherlands B.V. · NL

Inventors

• Byron Hassberg Lengsfield, III · Gilroy, US
• James Terrence Olson · San Jose, US
• Thomas Dudley Boone, Jr. · Redwood City, US
• Petrus Antonius Van Der Heijden · San Jose, US

Key dates

• Filing date: Apr 19, 2007
• Grant date: Feb 22, 2011
• Expiry date: Mar 4, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/1278
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A magnetic write head having independent trailing and side magnetic shields. The side shields and trailing shields are independently of one another so that they can have throat heights that are different from one another. This advantageously allows the magnetic potential between the write pole and side shields to be controlled independently of one another without relying on the side gap and trailing gap thicknesses. Furthermore, magnetic performance of the write head can be improved because the side shields can be constructed with varying tapered throat heights, while the throat height of the trailing shield can remain constant.