Magnetic head slider
View Patent ↗Embodiments of the present invention provide a magnetic head slider capable of reducing thermal protrusion attributable to a heating mechanism for heat-assisted recording. According to one embodiment, a magnetic head slider for heat-assisted recording includes an insulating film formed on an end surface of a slider, and a read element, a write device and a heating mechanism for heating a recording medium embedded in the insulating film. The heating mechanism includes an optical waveguide and a near-field light emitting device. A heat radiating film of a material having a thermal conductivity higher than that of the insulating film is formed near the heating mechanism so that one end surface thereof is exposed in an air bearing surface.
1. A magnetic head slider for heat-assisted recording comprising:
an insulating film formed on an end surface of a slider;
a read element, a write device, and a heating mechanism embedded in the insulating film, wherein the heating mechanism is used to heat a recording medium;
and a heat radiating film formed near the heating mechanism and having an end surface exposed to an air bearing surface; wherein the heat radiating film has a thermal conductivity higher than that of the insulating film,
wherein the heat radiating film has a surface facing the air bearing surface and has a sectional area that gradually increases toward the air bearing surface, and
wherein the heat radiating film is centered on, and entirely surrounds, an upper magnetic pole.
2. The magnetic head slider according to claim 1 , wherein the write device includes a lower magnetic pole, the upper magnetic pole magnetically connected to the lower magnetic pole on a side opposite the air bearing surface, and a write coil wound round a magnetic circuit formed by the lower and the upper magnetic pole; wherein the heating mechanism is embedded in the upper magnetic pole; and wherein the heat radiating film is disposed on the upper side of the upper magnetic pole.
3. The magnetic head slider according to claim 1 , wherein the write device includes a lower magnetic pole, the upper magnetic pole magnetically connected to the lower magnetic pole on a side opposite the air bearing surface, and a write coil wound round a magnetic circuit formed by the lower and the upper magnetic pole; wherein the heating mechanism is embedded in the upper magnetic pole; and wherein the heat radiating film has a first heat radiating film overlying the upper magnetic pole, and a second heat radiating film underlying the upper magnetic pole.
4. The magnetic head slider according to claim 1 , wherein the insulating film is formed of Al.sub.2O.sub.3; and the heat radiating film is made of a metal chosen from Au, Cu, Ni, Fe and W, an alloy of two or more of those metals, either of Al.sub.2O.sub.3-TiC or SiC, or a compound of Al.sub.2O.sub.3-TiC and SiC.
5. The magnetic head slider according to claim 1 , wherein the thickness of the heat radiating film gradually increases toward the air bearing surface.
6. The magnetic head slider according to claim 1 , wherein the heat radiating film disposed on transversely opposite sides of the heating mechanism.
7. A magnetic head slider according to claim 1 , wherein the heat radiating film surrounds the heating mechanism.