Perpendicular magnetic write head and magnetic write device

A perpendicular magnetic write head comprising:

• a magnetic pole having an end face on an air bearing surface;
• and
• a write shield layer having an end face on the air bearing surface, and surrounding the magnetic pole with a gap in between, on three sides, that is both sides in a write track width direction and a trailing side,
• wherein the end face of the magnetic pole has a trapezoid shape in which a width at a trailing edge is larger than a width at a leading edge, and
• relationships D1<D2, D1<D3, and D3≧D2 are satisfied in the air bearing surface, where D1 is a gap length of the side gap at the trailing edge, D2 is a gap length of the side gap at the leading edge, and D3 is a gap length of the side gap at any position between the trailing edge and the leading edge.

A perpendicular magnetic write head comprising:

• a magnetic pole having an end face on an air bearing surface;
• and
• a shield layer having an end face on the air bearing surface, and surrounding the magnetic pole with a gap in between, on all sides, that is both sides in a write track width direction, a trailing side, and a leading side,
• wherein the end face of the magnetic pole has a trapezoid shape in which a width at a trailing edge is larger than a width at a leading edge, and
• relationships D1<D2, D1<D3, and D3≧D2 are satisfied in the air bearing surface, where D1 is a gap length of the side gap at the trailing edge, D2 is a gap length of the side gap at the leading edge, and D3 is a gap length of the side gap at any position between the trailing edge and the leading edge.

A magnetic write device comprising a recording medium and a perpendicular magnetic write head, the perpendicular magnetic write head including:

• a magnetic pole having an end face on an air bearing surface, and
• a couple of side shield layers each having an end face on the air bearing surface, and arranged on both sides, in a write track width direction, of the magnetic pole with a side gap in between,
• wherein the end face of the magnetic pole has a trapezoid shape in which a width at a trailing edge is larger than a width at a leading edge, and
• relationships D1<D2, D1<D3, and D3≧D2 are satisfied in the air bearing surface, where D1 is a gap length of the side gap at the trailing edge, D2 is a gap length of the side gap at the leading edge, and D3 is a gap length of the side gap at any position between the trailing edge and the leading edge.