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Integrated Magnetoresistive Read Inductive Write Film Magnetic Head Assembly

IP.com Disclosure Number: IPCOM000047734D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Church, MA: AUTHOR [+2]

Abstract

A narrow track thin film magnetic head assembly is formed by depositing a geometrically biased magnetoresistive read element in the gap of an inductive write element with compensating angular pole tips. A geometrically biased narrow track magnetoresistive element is shown in Fig. 1. This element consists of a magnetic sensor stripe 1 comprised of NiFe with a bias layer of Ti conductors 2. When a bias current is applied to an element in this configuration, the current will flow across the sensor stripe in a path perpendicular to the conductors. This produces an angle between the bias current and the sensor stripe magnetization, causing the device to operate in the linear portion of its characteristic response curve. This effect, more commonly called barberpole biasing (*), is known to improve performance.

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Integrated Magnetoresistive Read Inductive Write Film Magnetic Head Assembly

A narrow track thin film magnetic head assembly is formed by depositing a geometrically biased magnetoresistive read element in the gap of an inductive write element with compensating angular pole tips. A geometrically biased narrow track magnetoresistive element is shown in Fig. 1. This element consists of a magnetic sensor stripe 1 comprised of NiFe with a bias layer of Ti conductors 2. When a bias current is applied to an element in this configuration, the current will flow across the sensor stripe in a path perpendicular to the conductors. This produces an angle between the bias current and the sensor stripe magnetization, causing the device to operate in the linear portion of its characteristic response curve. This effect, more commonly called barberpole biasing (*), is known to improve performance. In narrow track heads (<15 m), the sensor area between conductors is not wide enough to add the extra conductor bars that are required for a typical barberpole design. Consequently, in this design the bias angle is achieved by the angled conductors without the use of extra barberpole conductors. The inductive pole tips of this design together with the magneto-resistive sensor are shown in Fig. 2. This embodiment shows a NiFe P1 pole tip 3. An Al2O3 partial gap layer 4 is deposited, followed by the magnetoresistive sensor stripe 5 and conductors 6. A second Al2O3 layer 7 is deposited and,...