Browse Prior Art Database

Perpendicular Recording Read Write Head With High Reluctance Leg

IP.com Disclosure Number: IPCOM000053181D
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Schwartz, TA: AUTHOR

Abstract

A read/write head useful for perpendicular recording includes a magnetoresistive (MR) sensor element 1 positioned between two MR shields 2 and 3. The MR shield 2 has a substantially shorter leg than the MR shield 3. The short leg 3 is used as a shield for the MR sensor during the read mode.

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Perpendicular Recording Read Write Head With High Reluctance Leg

A read/write head useful for perpendicular recording includes a magnetoresistive (MR) sensor element 1 positioned between two MR shields 2 and 3. The MR shield 2 has a substantially shorter leg than the MR shield 3. The short leg 3 is used as a shield for the MR sensor during the read mode.

A high reluctance bridge 4 is coupled between the MR shields 2 and 3. The bridge formed between the two legs ensures that the leg forming the MR shield is at the same magnetic potential as the primary pole piece during the write mode. In this way, a return path for the write flux is prevented from forming.

By placing the read shield 2 directly below write conductor coils 5 and 6, a more planar structure is achieved. The coils may be made of the same material, such as permalloy, as the magnetic shields.

By having a soft magnetic layer 7 below the recording layer of the magnetic medium 8, the effectiveness of the higher reluctance is enhanced by providing a lower reluctance return path between the primary pole and the return pole.

The large surface area provided at the air-bearing surface 9 causes the return field to be extremely small, so that there is no interference with the write process. Also, the large separation of the return pole 10 from the write structure allows a minimal horizontal field component to exist between the return pole and the structure.

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