Giant spin-seebeck effect induced magnon transfer torque-assisted MAMR
A magnetic recording device includes a main pole, a coil around the main pole, a trailing shield, and a spin torque oscillation device between the main pole and the trailing shield. The spin torque oscillation device includes one or more first layers, a spacer layer, and a field generation layer. The one or more first layers are over the main pole. The one or more first layers have a first heat conductance or include a low-heat-conductance material. The spacer layer is over the one or more first layers. The field generation layer is over the spacer layer. A heat sink is in contact with the trailing shield. The heat sink has a second heat conductance or includes a high-heat-conductance material. The second heat conductance of the heat sink is higher than the first heat conductance of the one or more first layers.
1. A magnetic recording device, comprising:
a main pole;
a coil around the main pole;
a trailing shield having a notch;
a spin torque oscillation device between the main pole and the notch of the trailing shield, the spin torque oscillation device comprising:
a non-magnetic conductive layer over the main pole, the non-magnetic conductive layer having a first heat conductance; and
a field generation layer between the non-magnetic conductive layer and the notch of the trailing shield; and
a heat sink wrapped around the notch of the trailing shield, the heat sink comprising having a second heat conductance, the second heat conductance of the heat sink higher than the first heat conductance of the non-magnetic conductive layer.
2. The magnetic recording device of claim 1 , wherein the second heat conductance of the heat sink is a thermal conductivity of about 130 W/m·K or higher.
3. The magnetic recording device of claim 1 , wherein the first heat conductance of the non-magnetic conductive layer is a thermal conductivity of about 90 W/m·K or lower.
4. The magnetic recording device of claim 1 , wherein the heat sink comprises a material selected from a group consisting of as silver, copper, gold, aluminum, tungsten, alloys thereof, graphite, carbon nanotubes, and multiple layers thereof.
5. The magnetic recording device of claim 1 , wherein the non-magnetic conductive layer comprises a material selected from a group consisting of ruthenium, tantalum, non-magnetic nickel alloys, non-magnetic iron alloys, alloys thereof, and multiple layers thereof.
6. The magnetic recording device of claim 1 , wherein the heat sink and the non-magnetic conductive layer form a temperature gradient within the spin torque oscillation device from hot to cold in a direction from the main pole to the trailing shield.
7. The magnetic recording device of claim 1 , wherein the notch is selected from a group consisting of an attached notch or a detached notch.
8. A magnetic media drive comprising the magnetic recording device of claim 1 .
9. A magnetic recording device, comprising:
a main pole;
a coil around the main pole;
a trailing shield;
a spin torque oscillation device between the main pole and the trailing shield, the spin torque oscillation device comprising:
one or more first layers having a first heat conductance over the main pole;
a spacer layer over the one or more first layers; and
a field generation layer over the spacer layer; and
a heat sink in contact with the trailing shield, the heat sink having a second heat conductance, the second heat conductance of the heat sink higher than the first heat conductance of the one or more first layers.
10. The magnetic recording device of claim 9 , wherein the one or more first layers comprises a non-magnetic conductive layer, the non-magnetic conductive layer formed over the main pole.
11. The magnetic recording device of claim 10 , wherein the non-magnetic conductive layer comprises a material selected from a group consisting of ruthenium, tantalum, non-magnetic nickel alloys, non-magnetic iron alloys, alloys thereof, and multiple layers thereof.
12. The magnetic recording device of claim 9 , wherein the one or more first layers comprises a spin polarization layer, the spin polarization layer formed over a non-magnetic conductive layer formed between the main pole and the spin polarization layer.
13. The magnetic recording device of claim 9 , wherein the one or more first layers comprise a non-magnetic conductive layer and a spin polarization layer, the non-magnetic conductive layer formed over the main pole and the spin polarization layer formed over the non-magnetic conductive layer.
14. The magnetic recording device of claim 9 , wherein the heat sink is wrapped around a notch of the trailing shield.
15. The magnetic recording device of claim 9 , wherein the heat sink is wrapped around a capping layer formed between the field generation layer and the trailing shield.
16. The magnetic recording device of claim 9 , wherein the heat sink comprises a material selected from a group consisting of as silver, copper, gold, aluminum, tungsten, alloys thereof, graphite, carbon nanotubes, and multiple layers thereof.
17. A magnetic media drive comprising the magnetic recording device of claim 9 .