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INSULATING FLUX GUIDE FOR A TUNNEL JUNCTION SENSOR

IP.com Disclosure Number: IPCOM000014784D
Original Publication Date: 1999-Dec-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 34K

Publishing Venue

IBM

Related People

Harry Gill: AUTHOR

Abstract

A Tunnel Juction type sensor is usually sandwiched between ferromagnetic shields. The shields usually also act as the electrodes. Current flows from one shield to the other through the Tunnel Junction. It is very desirable that the sensor be placed away from the air bearing surface of the head to avoid electric shorts between the layers as well as corrosion of the layers. We disclose a new insulating flux guide material for the Tunnel Junction sensor. The material consists of CoFeHfO, where Hf is 10 atomic and oxygen 30 atomic . The material has high permeability but also possesses very high electrical resistivity. It forms the flux guide between the air bearing surface and the sensor. Due to its insulating properties, it is not necessary to put additional insulating layers between it and the shields. Therefore, the insulating flux guide material helps to achieve very narrow read gap (shield to shield spacing) at the air bearing surface for very high areal density designs. 1

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INSULATING FLUX GUIDE FOR A TUNNEL JUNCTION SENSOR

A Tunnel Juction type sensor is usually sandwiched between ferromagnetic shields. The shields usually also act as the electrodes. Current flows from one shield to the other through the Tunnel Junction. It is very desirable that the sensor be placed away from the air bearing surface of the head to avoid electric shorts between the layers as well as corrosion of the layers. We disclose a new insulating flux guide material for the Tunnel Junction sensor. The material consists of CoFeHfO, where Hf is < 10 atomic % and oxygen < 30 atomic % . The material has high permeability but also possesses very high electrical resistivity. It forms the flux guide between the air bearing surface and the sensor. Due to its insulating properties, it is not necessary to put additional insulating layers between it and the shields. Therefore, the insulating flux guide material helps to achieve very narrow read gap (shield to shield spacing) at the air bearing surface for very high areal density designs.

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