Thermally-assisted magnetic write head, head gimbal assembly, head arm assembly, and magnetic disk unit
View Patent ↗A thermally-assisted magnetic write head includes a waveguide, a magnetic pole, and a plasmon generator interposed between the waveguide and the magnetic pole. The magnetic pole includes a first surface exposed on an air bearing surface, a second surface facing the plasmon generator, and a third surface connecting the first surface and the second surface.
1. A thermally-assisted magnetic write head comprising:
a waveguide;
a magnetic pole; and
a plasmon generator interposed between the waveguide and the magnetic pole, wherein
the magnetic pole includes a first surface exposed on an air bearing surface, a second surface facing the plasmon generator, and a third surface connecting the first surface and the second surface, and
the third surface extending away from the plasmon generator when approaching the air bearing surface.
2. The thermally-assisted magnetic write head according to claim 1 , wherein the third surface includes a flat surface inclined with respect to the first surface and the second surface, or includes a curved surface.
3. The thermally-assisted magnetic write head according to claim 1 , wherein a front end surface of the magnetic pole and a front end surface of the plasmon generator are separated away from each other in the air bearing surface.
4. The thermally-assisted magnetic write head according to claim 1 , wherein a width of a front end surface of the magnetic pole is larger than a width of a front end surface of the plasmon generator.
5. The thermally-assisted magnetic write head according to claim 4 , wherein a width of the waveguide is larger than the width of the front end surface of the magnetic pole.
6. The thermally-assisted magnetic write head according to claim 5 , wherein the plasmon generator includes a forward section and a backward section, the forward section having a uniform width, the backward section being connected to a rear end of the forward section and having a width increasing with increase in distance from the forward section.
7. The thermally-assisted magnetic write head according to claim 2 , wherein the curved surface included in the third surface has a radius of curvature of 100 nm or less.
8. The thermally-assisted magnetic write head according to claim 2 , wherein an external angle between the flat surface included in the third surface and the air bearing surface is equal to or smaller than 45°.
9. The thermally-assisted magnetic write head according to claim 1 , wherein the waveguide and the plasmon generator are separated away from each other.
10. A head gimbal assembly comprising:
a magnetic head slider having a side surface, the side surface being provided with the thermally-assisted magnetic write head according to claim 1 ; and
a suspension having an end, the end being provided with the magnetic head slider.
11. A head arm assembly comprising:
a magnetic head slider having a side surface, the side surface being provided with the thermally-assisted magnetic write head according to claim 1 ;
a suspension having a first end and a second end, the first end being provided with the magnetic head slider; and
an arm supporting the second end of the suspension.
12. A magnetic disk unit with a magnetic recording medium and a head arm assembly, the head arm assembly comprising:
a magnetic head slider having a side surface, the side surface being provided with the thermally-assisted magnetic write head according to claim 1 ;
a suspension having a first end and a second end, the first end being provided with the magnetic head slider; and
an arm supporting the second end of the suspension.