SiN overcoat for perpendicular magnetic recording media
View Patent ↗A SiON overcoat for use on magnetic media for magnetic recording. The SiON overcoat is deposited by pulsed DC sputtering while applying a negative DC bias. The SiON overcoat is especially useful on perpendicular magnetic recording media because of its ability to deposit thinly and evenly on a rough, granular high coercivity recording media while maintaining excellent corrosion protection properties. A SiON overcoat can be applied less than 3 nm thick while still maintaining excellent mechanical and corrosion protection. The overcoat also has a very high density and water contact angle.
1. A magnetic media for use in a data recording system, the media comprising:
a magnetic layer; and
an overcoat formed over the magnetic layer, the overcoat consisting of SiO x N y , where x=0.8-1.2 and y=0.8-0.9;
wherein the overcoat has water contact angle greater than 100 degrees.
2. A magnetic media as in claim 1 wherein the overcoat has a thickness less than 3 nm.
3. A magnetic media as in claim 1 wherein the overcoat has a thickness of 1-2.5 nm.
4. A magnetic media as in claim 1 wherein the overcoat has a thickness of 2-2.5 nm.
5. A magnetic media for use in perpendicular magnetic recording, comprising:
a magnetic, low coercivity underlayer;
a magnetic high coercivity top layer formed over the underlayer; and
a non-magnetic overcoat formed over the high coercivity top layer, the overcoat consisting of SiO x N y , where x=0.8-1.2 and y=0.8-0.9;
wherein the overcoat has water contact angle greater than 100 degrees.
6. A magnetic media as in claim 5 wherein the overcoat has a thickness less than 3 nm.
7. A magnetic media as in claim 5 wherein the overcoat has a thickness less than 3 nm.
8. A magnetic media as in claim 5 wherein the overcoat has a thickness of 1-2.5 nm.
9. A magnetic media as in claim 5 wherein the overcoat has a thickness of 2-2.5 nm.
10. A disk drive system comprising:
a housing;
a motor mounted within the housing;
a magnetic disk rotatably connected with the motor, the magnetic disk comprising a magnetic layer and an overcoat formed on the magnetic layer, the overcoat consisting of SiO x N y , where x=0.8-1.2 and y=0.8-0.9;
an actuator; and
a slider connected with the actuator for movement adjacent to a surface of the magnetic disk, the slider including a magnetic write head and a magnetic read head;
wherein the overcoat has water contact angle greater than 100 degrees.
11. A disk drive as in claim 10 wherein the overcoat has a thickness less than 3 nm.