Differentially sensitive single track read/write head design wit

Details Differentially sensitive single track read/write head design wit Differentially sensitive single track read/write head design wit

1987-11-12

1989-08-22

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

048601381

ABSTRACT:
A simplified structure for a single track read/write head design is disclosed. The design incorporates a simplified write coil structure and an improved and simplified combined magnetic bias and sensor current structure. The active sensing current is utilized both to create an anti-parallel magnetic vector couple in a coupled film magneto resistive sensor and to magnetically bias or torque the anti-parallel couple so that magnetization within the sensor films lies at an angle with the easy magnetic axis. Sensor current is fed in series through an electro-magnetic coil wrapped about the magneto resistive sensor so that sense current simultaneously creates an anti-parallel magnetic vector couple in the sensor and generates an electromagnetic bias field to torque the anti-parallel couple at an angle with the easy axis of magnetization. An improved spirally laid-out planar deposited writing flux coil is positioned about the writing electromagnetic core which greatly simplifies fabrication steps in making the device.

REFERENCES:
patent: 4100583 (1978-07-01), Koel et al.
patent: 4589041 (1986-05-01), Voegeli
patent: 4626946 (1986-12-01), Vinal
patent: 4698711 (1987-10-01), Vinal
patent: 4782415 (1988-11-01), Vinal

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