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Browse Prior Art Database

Spin Valve Sensor in Horizontal Configuration

IP.com Disclosure Number: IPCOM000117834D
Original Publication Date: 1996-Jun-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Gill, HS: AUTHOR

Abstract

A horizontal configuration of SPIN VALVE sensor may be desirable, since it simplifies sensor manufacturing process by possibly eliminating slider fabrication process. The active read sensor is normally embedded away from the air bearing surface, thus improving its reliability in near head/disk contact applications. However, since the sensor is embedded, its read sensitivity decreases due to loss of read back magnetic flux. Another problem with conventional Horizontal sensors is that the read sensors losses its initialized magnetic state due to large field from the write coil during the write operation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 62% of the total text.

Spin Valve Sensor in Horizontal Configuration

      A horizontal configuration of SPIN VALVE sensor may be
desirable, since it simplifies sensor manufacturing process by
possibly eliminating slider fabrication process.  The active read
sensor is normally embedded away from the air bearing surface, thus
improving its reliability in near head/disk contact applications.
However, since the sensor is embedded, its read sensitivity decreases
due to loss of read back magnetic flux.  Another problem with
conventional Horizontal sensors is that the read sensors losses its
initialized magnetic state due to large field from the write coil
during the write operation.

      A horizontal sensor is disclosed in the Figure to overcome the
problems mentioned above.  The Spin Valve Sensor consists of
NiFe/Cu/NiFe sandwich.  The sense current flows 90º  to the
magnetic easy axes of the ferromagnetic NiFe films.  The magnetic
field from the sense acts on the ferromagnetic films parallel to
their magnetic easy axes and provides flux closure condition.
Therefore, the NiFe/Cu/NiFe sandwich can be initialized to a uniform
magnetic state by the magnetic field from the sense current.  Large
amplitude, narrow pulse of sense current could be applied before read
cycle begins to initialize the the sensor to a uniform magnetic
state.  Since the sensor is embedded away from the air bearing
surface, it offers the opportunity to select its length and width to
maximize read back sensitivity...