Browse Prior Art Database

Flux Guide/Tunnel Valve Structure With Conducting Contiguous Junction

IP.com Disclosure Number: IPCOM000014163D
Original Publication Date: 2000-Dec-01
Included in the Prior Art Database: 2003-Jun-19
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Abstract

Disclosed is a new flux guide/tunnel valve structure which achieves conducting contiguous junction between the flux guide and the tunnel valve sensor. The conducting contiguous junction will provide higher flux coupling efficiency compared to the prior art insulating contiguous junction. In addition, the new structure provides straight side walls for the front flux guide implying better track width definition.

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

Page 1 of 1

Flux Guide/Tunnel Valve Structure With Conducting Contiguous Junction

   Disclosed is a new flux guide/tunnel valve structure which achieves conducting contiguous junction between the flux guide and the tunnel valve sensor. The conducting contiguous junction will provide higher flux coupling efficiency compared to the prior art insulating contiguous junction. In addition, the new structure provides straight side walls for the front flux guide implying better track width definition.

The process sequence/steps for the new structure is:
1. Deposit bottom ferromagnetic shield.
2. Deposit insulation, flux guide, and insulation.
3. Pattern flux guide (etch flux guide only), deposit hard bias and insulation over the hard bias. The structure at this point is shown in Fig. A.

4. Pattern tunnel valve, etch flux guide and insulation down to shield. The structure is shown in Fig.


5. Deposit tunnel valve with free layer at bottom.
6. Pattern tunnel valve, and deposit insulation/hard bias/insulation. The structure is shown in Fig.


B.


C.


7. Deposit top ferromagnetic shield. The shields make electrical contact only to tunnel valve.

1