Three-pole magnetic recording head
AssigneeDigital Equipment Corporation
InventorMichael Mallary
Life of this patent
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Abstract
The head includes a read pole disposed between a pair of write poles spaced apart to form a gap therebetween. The read pole conducts flux to a flux sensor that is located away from the gap. The head can be utilized for both longitudinal and perpendicular recording and the readback function can be carried out by an inductive coil or flux sensing devices such as a Hall sensor or an MR sensor. The recording head achieves high readback resolution, high write field gradients, and the capability for write wide-read narrow. The read pole and write poles are laminated structures.
Claims17
Magnetic recording head comprising a read pole disposed between a pair of write poles;
- and
- a Hall-type magnetic flux sensor associated with the read pole and spaced away from the pole tips, the read pole adapted to conduct flux from its pole tip to the flux sensor and being isolated from the write poles by respective isolation gaps.
Magnetic recording head comprising a read pole disposed in a gap between a pair of write poles;
- a magnetic flux sensor spaced away from the gap, the read pole adapted to conduct flux to the flux sensor;
- and
- at least one magnetically saturable side shield adjacent to the three poles, the side shields suppressing adjacent track fringing interference during read operation and saturating during write operation so as to effectively appear not to be present.
A magnetic recording head having a read pole disposed in a gap between a pair of write poles, and a magnetic flux sensor associated with the read pole and spaced away from the read pole tip, the read pole adapted to conduct flux from its tip to the flux sensor, at least one of the write poles being tapered inward toward the read pole as the write pole extends to its tip, the read pole being isolated from the write poles.
Dependencies are inferred from the claim text.