Magnetic head and magnetic disk storage apparatus mounting the same
View Patent ↗Embodiments of the invention provide a magnetic head which assures an improved format efficiency without increase in the magnetic field intensity applied at a read element. In one embodiment, a magnetic head incorporates a write head having a main pole and an auxiliary pole, and a read head having a read element between reader shields. An auxiliary shield as a magnetic body is provided between the main pole and reader shields or on the opposite side of the main pole with the reader shields between the main pole and the auxiliary shield.
1. A magnetic head comprising:
a read head proximate to a leading side and having a lower shield proximate to the leading side, an upper shield distal from the leading side, and a magneto resistive element located between said lower and upper shields;
a write head distal from the leading side and having a main pole proximate to the leading side and an auxiliary pole distal from the leading side; and
an auxiliary shield as a magnetic body located between the leading side and the lower shield;
wherein an upper part of the auxiliary shield protrudes toward a back contact position side of the main pole.
2. The magnetic head as claimed in claim 1 , wherein a length of said auxiliary shield in a direction of an element height is longer than a length of said lower and upper shields in the direction of the element height.
3. The magnetic head as claimed in claim 1 , wherein a length of said auxiliary shield in a direction of a track width is longer than a length of said lower and upper shields in the direction of the track width.
4. The magnetic head as claimed in claim 1 , wherein a length of said auxiliary shield in a direction of an element height is shorter than a distance from an air bearing surface to a position farthest from the air bearing surface in an area of connection of said main pole and said auxiliary pole.
5. The magnetic head as claimed in claim 1 , wherein a distance between said auxiliary shield and said upper shield is about 1 mm or more.
6. The magnetic head as claimed in claim 1 , wherein the auxiliary shield is recessed from an air bearing surface.
7. The magnetic head as claimed in claim 1 , wherein the auxiliary shield is larger in area than each the lower shield and the upper shield.
8. The magnetic head as claimed in claim 1 , wherein a relation of μ 1 /μ 2 is satisfied where μ 1 represents permeability of said auxiliary shield and μ 2 represents permeability of said upper and lower shields.
9. The magnetic head as claimed in claim 1 , wherein a relation of L 1 ≦L 2 is satisfied where L 1 represents a distance from a position farthest from the air bearing surface in an area of connection of said main pole and said auxiliary pole to the auxiliary shield and L 2 represents a distance from a position farthest from the air bearing surface in an area of connection of said main pole and said auxiliary pole to said upper shield.
10. The magnetic head as claimed in claim 1 , wherein a relation of (μ 1 /L 1 )≧(μ 2 /L 2 ) is satisfied where μ 1 represents permeability of said auxiliary shield, μ 2 represents permeability of said upper shield, L 1 represents a distance from a position farthest from an air bearing surface in an area of connection of said main pole and said auxiliary pole to the auxiliary shield, and L 2 represents a distance from a position farthest from the air bearing surface in an area of connection of said main pole and said auxiliary pole to said upper shield.
11. The magnetic head as claimed in claim 1 , wherein a length of said auxiliary shield in a direction of a track width is longer than a length of said lower and upper shields in the direction of the track width.
12. The magnetic head as claimed in claim 1 , wherein a distance between said auxiliary shield and said lower shield is about 1 mm or more.
13. A magnetic disk storage apparatus comprising:
a magnetic recording medium having a magnetic recording layer and a soft underlayer;
a medium drive which drives said magnetic recording medium;
a magnetic head which writes to, and reads from, said magnetic recording medium; and
a magnetic head drive which drives said magnetic head with respect to said magnetic recording medium,
wherein said magnetic head comprises
a read head proximate to a leading side and having a lower shield proximate to the leading side, an upper shield distal from the leading side and a magneto resistive element located between said upper and lower shields;
a write head distal from the leading side and having a main pole proximate to the leading side and an auxiliary pole distal from the leading side; and
an auxiliary shield as a magnetic body which is located between the leading side and the lower shield;
wherein an upper part of the auxiliary shield protrudes toward a back contact position side of the main pole.