Patent ID: 7245454

Claim:
A magnetic head for vertical magnetic recording comprising: a medium facing surface that faces toward a recording medium; a coil for generating a magnetic field corresponding to data to be written on the recording medium; a main pole layer for allowing a magnetic flux corresponding to the field generated by the coil to pass therethrough and generating a write magnetic field for writing the data on the recording medium through the use of a vertical magnetic recording system; an auxiliary pole layer disposed with a specific space from the main pole layer along a direction of movement of the recording medium; a gap layer made of a nonmagnetic material and provided between the main pole layer and the auxiliary pole layer; and a yoke layer connected to the main pole layer and the auxiliary pole layer and magnetically coupling the main pole layer to the auxiliary pole layer, wherein: the main pole layer incorporates: a first portion disposed in a region closer to the medium facing surface than a first position located at a specific distance from the medium facing surface, the first portion having a uniform width from the medium facing surface to the first position; and a second portion disposed in a region farther from the medium facing surface than the first position and having a width greater than the width of the first portion; each of the first portion and the second portion has a first surface closer to the gap data-layer and a second farther from the gap layer, the second surface of the first portion being substantially flat; the first portion further includes a region closer to the medium facing surface than a second position located between the first position and the medium facing surface, the region closer to the medium facing surface than the second position having a specific thickness, and includes a region farther from the medium facing surface than the second position, the region farther from the medium facing surface than the second position having a thickness greater than the specific thickness; the yoke layer extends from a connection point between the yoke layer and the auxiliary pole layer toward the medium facing surface, touches the first surface of the second portion of the main pole layer, and has an end that is closer to the medium facing surface and located at a distance from the medium facing surface; and the second position is located closer to the medium facing surface than the end of the yoke layer.