Browse Prior Art Database

Self-Aligned Flux Guide/Tunnel Valve Structure

IP.com Disclosure Number: IPCOM000014753D
Original Publication Date: 2001-Mar-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 35K

Publishing Venue

IBM

Abstract

The structure disclosed here accomplishes integration of flux guide with the Tunnel Valve sensor. The flux guide is deposited below the Tunnel Valve. Over the active area of the sensor, the flux guide is antiparallel coupled to a high coercivity layer so that the flux guide is pinned. The high coercivity layer is separated from the free layer by a spacer layer (e.g. a thin layer of copper). The flux guide conducts flux from the air bearing surface to the front end of the free layer, the flux then conducts through the free layer since the flux guide is pinned by high coercivity layer.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Self-Aligned Flux Guide/Tunnel Valve Structure

   The structure disclosed here accomplishes integration of flux guide with the Tunnel Valve sensor. The flux guide is deposited below the Tunnel Valve. Over the active area of the sensor, the flux guide is antiparallel coupled to a high coercivity layer so that the flux guide is pinned. The high coercivity layer is separated from the free layer by a spacer layer (e.g. a thin layer of copper). The flux guide conducts flux from the air bearing surface to the front end of the free layer, the flux then conducts through the free layer since the flux guide is pinned by high coercivity layer.

A cross-section through the active area of the sensor shows the following layers:

     Shield/spacer/flux guide/Ru/high Hc material/spacer/free layer/tunneling barrier/pinned layer/antiferromagnet/cap/Shield A cross-section through the flux guide portion shows the following layers:

Shield/spacer/flux guide/gap fill/Shield

1