Magnetic write head employing multiple magnetomotive force sources

Abstract

A write head for perpendicular magnetic recording having a write pole and first and second return poles. The write head can include a first magnetomotive force source for delivering a magnetomotive force to the first return pole and the write pole and a second magnetomotive force source for delivering magnetomotive force to the second return pole and the write pole. The first and second magnetomotive force sources can be operated independently of one another so that different relative amounts of magnetomotive force can be applied to the first and second return poles. A trailing magnetic shield can be connected with one of the return poles, such as the second return poles, and the variation in magnetomotive force can be used to increase the amount of flux flowing through the trailing shield when increased field gradient is desired (such as when writing a transition), and to decrease the amount of flux through the trailing shield when decreased field gradient and increased write field are desired (such as when writing a long magnetic section on a magnetic medium).

Description

technical field [0001] The present invention relates to magnetic data recording, and in particular to a magnetic write head having a dynamically variable write field generated by multiple magnetomotive force (MMF) sources. Background technique [0002] At the heart of a computer's long-term storage is a component called a disk drive. A disk drive includes a spinning disk, write and read heads suspended by a cantilever adjacent the surface of the spinning disk, and an actuator that rotates the suspension to place the read and write heads on selected tracks on the spinning disk . The read and write heads are located directly on the slider with an air bearing surface (ABS). The cantilever biases the slider toward the surface of the disk, and as the disk rotates, the air adjacent to the disk moves with the surface of the disk. The slider flies above the disk surface on this pad of moving air. The write and read heads are employed to write and read magnetic transitions to and...

AI Technical Summary

Problems solved by technology

Unfortunately, this means that a certain amount of write field is lost into the trailing shield

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