Disk drive in which magnetic head-to-disk capacitive coupling is

Details Disk drive in which magnetic head-to-disk capacitive coupling is Disk drive in which magnetic head-to-disk capacitive coupling is

1990-08-09

1992-08-25

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Coil

360 9702, 360128, 361212, G11B 517, G11B 3314, G11B 540, H05F 100

Patent

active

051424258

ABSTRACT:
A thin film magnetic data transducer which prevents capacitive coupling between the transducer and the disk of a disk drive system, has a magnetic circuit which is maintained at the same potential as the disk, usually ground potential. With the disk and the magnetic pole tips of the magnetic circuit at the same potential, capacitive charging and consequent current flow or arcing or discharge noise between the two are prevented. Noise from current due to the variable capacitive coupling of the coil to the disk during disk rotation is also eliminated. The thin film magnetic transducer is fabricated by depositing successive layers of an electrical insulating material, a magnetic material, insulating material, electrical conducting material for a planar coil, insulating material and magnetic material, in the order named on a substrate. The planar coil comprises spiral turns and the magnetic material layers are joined with each other within the spiral turns of the coil and encircle the coil, providing a magnetic gap between pole tips outside the of the coil. A thin film extension of the magnetic circuit is part of a circuit which connects the magnetic circuit to the frame of the disk drive as are the disks, which is usually ground potential.

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