Patent ID: 8072706

Claim:
A magnetic head for perpendicular magnetic recording, comprising: a medium facing surface that faces a recording medium; a coil that produces a magnetic field corresponding to data to be recorded on the recording medium; a main magnetic pole that has an end face located in the medium facing surface, allows a magnetic flux corresponding to the magnetic field produced by the coil to pass, and produces a recording magnetic field for recording the data on the recording medium by means of a perpendicular magnetic recording system; and an accommodation part having an accommodating groove that accommodates the main magnetic pole, wherein: the main magnetic pole includes a first part that extends from the medium facing surface to a point at a predetermined distance from the medium facing surface, and a second part that is other than the first part; the accommodation part includes: a first layer that has a groove; a second layer that is located in the groove of the first layer so as to lie between the first layer and the main magnetic pole; and a third layer that is located in the groove of the first layer so as to be interposed in part between the second layer and the main magnetic pole; the groove of the first layer has a first wall face and a second wall face that are located on both sides of the main magnetic pole opposite to each other in a track width direction, and a bottom surface that connects the first and second wall faces to each other; the second layer is formed of a metal material different from a material used to form the first layer, while the third layer is formed of an inorganic insulating material; the second layer and the third layer lie between the first layer and the first part; the second layer lies between the bottom surface of the groove of the first layer and the second part, but the third layer does not lie between them; a distance between the bottom surface of the groove of the first layer and the second part is smaller than that between the bottom surface and the first part; and a distance from the second part to each of the first and second wall faces of the groove of the first layer is smaller than that from the first part to each of the first and second wall faces.