MAGNETIC HEAD AND INFORMATION STORAGE APPARATUS
According to one embodiment, a magnetic head includes: a coil configured to be supplied with current; a main magnetic pole configured to be disposed along one surface of the coil and extend in a direction orthogonal to a floating surface from the floating surface; at least one auxiliary magnetic pole configured to be disposed along other surface of the coil and parallel to the main magnetic pole; a connecting portion configured to be linked with the coil and connect the main magnetic pole and the auxiliary magnetic pole; and a radiating layer configured to be disposed between the coil and the auxiliary magnetic pole and have larger thermal conductivity than the auxiliary magnetic pole.
1 . A magnetic head, comprising:
a coil configured to be supplied with current;
a main magnetic pole configured to be disposed along one surface of the coil and extend in a direction orthogonal to a floating surface from the floating surface;
at least one auxiliary magnetic pole configured to be disposed along other surface of the coil and parallel to the main magnetic pole;
a connecting portion configured to be linked with the coil and connect the main magnetic pole and the auxiliary magnetic pole; and
a radiating layer configured to be disposed between the coil and the auxiliary magnetic pole and have larger thermal conductivity than the auxiliary magnetic pole.
2 . The magnetic head of claim 1 ,
wherein the coil is a double coil having two coil portions differing from each other in a winding direction of a winding constituting the coil,
the at least one auxiliary magnetic pole faces the main magnetic pole with the winding constituting one of the two coil portions therebetween, and
the radiating layer is provided on a surface of the auxiliary magnetic pole facing the main magnetic pole.
3 . The magnetic head of claim 1 , further comprising:
a magnetic head substrate configured to hold the coil, the main magnetic pole, the auxiliary magnetic pole, and the connecting portion; and
a heat transmitting member configured to be interposed between the radiating layer and the magnetic head substrate.
4 . The magnetic head of claim 1 , wherein
the auxiliary magnetic pole is configured to include a plurality of magnetic poles arranged in a direction along the floating surface, and
a second radiating layer is provided on one surface of one of the magnetic poles arranged on the most end side among the magnetic poles, the one surface of the one of the magnetic poles facing a direction opposite to a direction to which other surface of the one of the magnetic poles opposite to an adjacent magnetic pole faces.
5 . The magnetic head of claim 1 , further comprising:
a magnetic head substrate configured to hold the coil, the main magnetic pole, the auxiliary magnetic pole, and the connecting portion,
wherein the radiating layer is formed of a material that has a smaller thermal expansion coefficient than the magnetic head substrate.
6 . The magnetic head of claim 5 , wherein the radiating layer is formed of a material containing at least one of silicon carbide, tungsten, aluminum nitride, and molybdenum.
7 . A magnetic head, comprising:
a coil configured to be supplied with current and composed of a spirally wound winding;
a main magnetic pole configured to be linked with the coil and extend in a direction orthogonal to a floating surface from the floating surface;
at least two auxiliary magnetic poles configured to face the main magnetic pole with a portion of the winding constituting the coil therebetween and be disposed parallel to the main magnetic pole;
a connecting portion configured to connect the main magnetic pole and the auxiliary magnetic poles; and
a radiating layer configured to be disposed between the coil and the main magnetic pole and have larger thermal conductivity than the main magnetic pole.
8 . The magnetic head of claim 7 , further comprising:
a magnetic head substrate configured to hold the coil, the main magnetic pole, the auxiliary magnetic poles, and the connecting portion; and
a heat transmitting member configured to be interposed between the radiating layer and the magnetic head substrate.
9 . The magnetic head of claim 7 , wherein
the auxiliary magnetic poles are configured to include a plurality of magnetic poles arranged in a direction along the floating surface, and
a second radiating layer is provided on one surface of one of the magnetic poles arranged on the most end side among the magnetic poles, the one surface of the one of the magnetic poles facing a direction opposite to a direction to which other surface of the one of the magnetic poles opposite to an adjacent magnetic pole faces.
10 . The magnetic head of claim 7 , further comprising:
a magnetic head substrate configured to hold the coil, the main magnetic pole, the auxiliary magnetic poles, and the connecting portion,
wherein the radiating layer is formed of a material that has a smaller thermal expansion coefficient than the magnetic head substrate.
11 . The magnetic head of claim 10 , wherein the radiating layer is formed of a material containing at least one of silicon carbide, tungsten, aluminum nitride, and molybdenum.
12 . An information storage apparatus, comprising:
a storage medium; and
a magnetic head configured to record information represented by magnetization on the storage medium,
wherein the magnetic head comprises:
a coil configured to be supplied with current;
a main magnetic pole configured to be disposed along one surface of the coil and extend in a direction orthogonal to a floating surface from the floating surface;
at least one auxiliary magnetic pole configured to be disposed along the other surface of the coil and parallel to the main magnetic pole;
a connecting portion configured to be linked with the coil and connect the main magnetic pole and the auxiliary magnetic pole; and
a radiating layer configured to be disposed between the coil and the auxiliary magnetic pole and have larger thermal conductivity than the auxiliary magnetic pole.