Inductive head and magnetic disk apparatus

A magnetic head comprising:

• a lower magnetic core,
• a magnetic pole tip layer formed on the lower magnetic core, where the magnetic pole tip layer consists of three layers of a magnetic layer/magnetic gap layer/magnetic layer,
• an upper magnetic core coupled in a front end to said magnetic pole tip layer, and in a rear end to said lower magnetic core,
• a coil formed between said upper magnetic core and said lower magnetic core, and
• an insulating layer,
• wherein a thickness of a front end of said magnetic pole tip layer which includes thicknesses of all three layers of the magnetic layer/magnetic gap layer/magnetic layer is thicker than a thickness of a rear end of said magnetic pole tip layer which includes thicknesses of all three layers of the magnetic layer/magnetic gap layer/magnetic layer, and
• a width in a track width direction of said front end of said upper magnetic core is bigger than a width in a track width direction of said rear end of said magnetic pole tip layer.

An inductive head comprising a lower magnetic core formed on a substrate, a magnetic pole tip layer formed on the lower magnetic core which consists of three layers of a magnetic layer/magnetic gap layer/magnetic layer, an upper magnetic core coupled in its front end to the magnetic pole tip layer, coupled in its rear end to the lower magnetic core, having a width of the front end smaller than that of the rear end, and having at least partially a shape gradually reducing the width from the rear end to the front end, coils disposed between the upper magnetic core and the lower magnetic core, and an insulating layer formed between the coils and the upper magnetic core or the lower magnetic core,

• wherein a distance between a top surface of the magnetic pole tip layer and an under surface of magnetic pole tip layer which includes thicknesses of all three layers of the magnetic layer/magnetic gap layer/magnetic layer in a line substantially normal to the lower magnetic core and in a rear end region away from an air bearing surface in a region connecting the magnetic pole tip layer to said upper magnetic core, is shorter than the distance in the air bearing surface between the top surface of said magnetic pole tip layer and the under surface of magnetic pole tip layer which includes thicknesses of all three layers of the magnetic layer/magnetic gap layer/magnetic layer in a line substantially normal to the lower magnetic core.