Magnetic head and magnetic disk system having a read sensor...

Details Magnetic head and magnetic disk system having a read sensor... Magnetic head and magnetic disk system having a read sensor...

2011-06-28

2011-06-28

Castro, Angel A. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07969691

ABSTRACT:
A read sensor is disposed near a main pole, thereby reducing the distance between the read sensor and a write sensor. In this case, however, a magnetic field generated from the main pole affects magnetization of a free layer and a pinned layer of a magnetoresistive film, thereby causing the magnetizing directions to rotate, a magnetic barrier to be generated, and the read property to be degraded. According to the present invention, a main pole and a yoke configure a magnetic circuit together with a sub-pole and a soft magnetic under layer of the magnetic disk and an exciting coil magnetizes the magnetic circuit, thereby a recording magnetic field is applied to a recording layer to record information bits on the layer. And in order to sharpen the magnetic field distribution generated by the main pole, a trailing shield made of a ferromagnetic material is disposed at the trailing side of the main pole adjacently. And a read sensor (magnetoresistive element) for reading bit information is provided between the trailing shield and the main pole.

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