Magnetic head for perpendicular recording and magnetic disk storage apparatus mounting the head
AssigneeHitachi Global Storage Technologies Japan, Ltd.
InventorsMasafumi Mochizuki, Atsushi Nakamura, Yoji Maruyama
Life of this patent
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Abstract
A magnetic head is composed to diminish disordered writing bits of a recording layer or reading noise caused by a magnetic field generated from an under layer without decreasing a writing magnetic field strength of the magnetic head. The magnetic head includes a write head provided with a main pole and one or more auxiliary poles, a read head provided with a read element, and coils located on both sides of the main pole in a manner to sandwich the main pole. The coil located on one side generates the asymmetrical magneto-motive force for magnetizing the main pole to that generated by the coil located on the other side.
Claims21
A magnetic disk storage apparatus comprising:
- a magnetic head having a read head and a write head;
- the read head having a lower shield, an upper shield, and a read element formed between the lower shield and upper shield;
- the write head having a main pole, one auxiliary pole, and coils located on both sides of the main pole;
- and
- a magnetic medium having a soft magnetic underlayer and a magnetic recording layer formed above the soft magnetic underlayer,
- wherein a magnetic field from the main pole enters into the auxiliary pole through the magnetic recording layer and the soft magnetic underlayer,
- the coils are arranged so as to magnetize the main pole in accordance with an electrical current flowing in the coils, and
- the coils generate different respective magneto-motive forces.
A magnetic disk storage apparatus comprising:
- a magnetic head having a read head and a write head;
- the read head having a lower shield, an upper shield, and a read element formed between the lower shield and upper shield;
- the write head having a main pole, one auxiliary pole located only on one side of the main pole, and coils located on both sides of the main pole;
- and
- a magnetic medium having a soft magnetic underlayer and a magnetic recording layer formed above the soft magnetic underlayer,
- wherein a magnetic field from the main pole enters into the auxiliary pole through the magnetic recording layer and the soft magnetic underlayer,
- the coils are arranged so as to magnetize the main pole in accordance with an electrical current flowing in the coils, and
- a current flowing in the coil located on the side of the main pole having no auxiliary pole is greater than a current flowing in the coil located on the side of the main pole having an auxiliary pole.
A magnetic disk storage apparatus comprising:
- a magnetic head having a read head and a write head;
- the read head having a lower shield, an upper shield, and a read element formed between the lower shield and upper shield;
- the write head having a main pole, one auxiliary pole, located only on one side of the main pole, and coils located on both sides of the main pole;
- and
- a magnetic medium having a soft magnetic underlayer and a magnetic recording layer formed above the soft magnetic underlayer,
- wherein a magnetic field from the main pole enters into the auxiliary pole through the magnetic recording layer and the soft magnetic underlayer,
- the coils are arranged to as to magnetize the main pole in accordance with an electrical current flowing in the coils, and
- a number of windings of the coil located on the side of the main pole having no auxiliary pole is greater than that of the coil located on the side of the main pole having an auxiliary pole.
Dependencies are inferred from the claim text.