Patent ID: 7656616

Claim:
A magnetic head device, comprising: a slider having a facing side that faces a recording medium and a pressing side that exerts a pressing force on the recording medium; and a magnetic function unit provided in a trailing side of the slider, and performs at least one of a magnetic recording and a magnetic reproducing, wherein the face side of the slider has a front region located in a leading side, a rear region located in the trailing side and a middle region located therebetween, wherein the middle region includes a concave bottom surface that is farther from the recording medium than the front region and the rear region, the front region includes a front positive pressure surface that is near to the recording medium therein, and the rear region includes a rear positive pressure surface that is near to the recording medium therein, wherein the rear positive pressure surface is located more toward the front than the magnetic function unit and more rearwards than an exerting point of the pressing force, a retreating surface being provided in a side that is farther from the recording medium than the rear positive pressure surface between the rear positive pressure surface and the magnetic function unit, wherein the rear region includes a negative pressure generating surface that is farther from the recording medium than the rear positive pressure surface and is nearer to the recording medium than the concave bottom surface than the rear positive pressure surface in both left and right sides of at least a part of the rear positive pressure surface, a dam surface nearer to the recording medium than the negative pressure generating surface being provided in front of the negative pressure generating surface, and wherein the dam surface is located coplanarly with the rear positive pressure surface.