Patent ID: 7180704
Filing Date: 2007-02-20
Classification: B82Y,G11B

Abstract:
1. A magnetic head comprising: a reproducing head having an upper shield, a lower shield, and a reproducing element disposed between said upper shield and said lower shield; a recording head having a main magnetic pole, a first auxiliary magnetic pole, a second auxiliary magnetic pole, and a first excitation coil and a second excitation coil disposed at both sides of said main magnetic pole, said first excitation coil is formed between said main magnetic pole and said first auxiliary magnetic pole, said second excitation coil is formed between said main magnetic pole and said second auxiliary magnetic pole; wherein an area opposed to a floating surface side of said first auxiliary magnetic pole and an area opposed to a floating surface side of said second auxiliary magnetic pole are asymmetric, a number of turns of coil of said first excitation coil and a number of turns of coil of said second excitation coil are asymmetric, said main magnetic pole is excited by applying current to pass said first excitation coil and said second excitation coil, and a magnetomotive force of said first excitation coil and a magneto-motive force of said second excitation coil are asymmetric.