Current-in-Plane GMR Trilayer Head Design for Hard-Disk Drives: Characterization and Extendibility

The current-in-plane giant magnetoresistive (GMR) trilayer readback sensor (CIP-3L), where only one permanent magnet at the back edge of the GMR stack is used to stabilize and bias a dual free layer system, is reviewed. Micromagnetic modeling is employed to show that the design has improved efficien...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2007-02, Vol.43 (2), p.645-650
Main Authors: Lamberton, R., Seigler, M., Pelhos, K., Hua Zhou, McCurry, M., Ormston, M., Gary Yi, McClean, G., McLaughlin, T., Kolbo, P., Heininen, O., Sapozhnikov, V., Sining Mao
Format: Article
Language:English
Subjects:
Abutted junction (AJ)
areal density (AD)
Cross-disciplinary physics: materials science
rheology
Density
Design engineering
Disk drives
Exact sciences and technology
Giant magnetoresistance
Hard disks
Information storage
Linearity
Magnetic heads
Magnetic sensors
Magnetism
Materials science
micromagnetic modeling
Micromagnetics
Other topics in materials science
Permanent magnets
Physics
Readers
Recording
Sensor phenomena and characterization
Sensor systems
Stability
Symmetry
trilayer readback sensor
Tunneling magnetoresistance
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Summary:The current-in-plane giant magnetoresistive (GMR) trilayer readback sensor (CIP-3L), where only one permanent magnet at the back edge of the GMR stack is used to stabilize and bias a dual free layer system, is reviewed. Micromagnetic modeling is employed to show that the design has improved efficiency over abutted junction (ABJ) tunneling magnetoresistive (TMR) head designs. An experimental evaluation of how permanent magnet thickness (PM Th), interlayer exchange coupling (J), and stripe height impact the signal-to-noise ratio, symmetry, and stability of prototype CIP-3L heads is conducted. The study indicates that PM Th >400 nm, J
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2006.888213