Media non-contacting magnetic recording head
The present disclosure generally relates to a head assembly of a data storage device. The data storage device may include magnetic media embedded in the device or magnetic media from an insertable cassette or cartridge (e.g., in an LTO drive), where the magnetic head assembly reads from and writes to the magnetic media. During drive operation, the magnetic media moves across the magnetic head assembly. The magnetic head assembly is spaced a distance from the magnetic media such that non-contact recording occurs between the magnetic head assembly and the magnetic media. The magnetic media is supported by either a back plate or an air film generated by one or more fillet edges of the back plate and the velocity of the magnetic media as the magnetic media moves across the magnetic head assembly.
1. A data storage device, comprising:
a magnetic recording head assembly configured to read from and write to a magnetic media, the assembly comprising a slider comprising one or more read elements and one or more write elements; and
a back plate disposed adjacent to the slider, the back plate comprising a first surface having a roughness between about 5 nm and about 100 nm disposed at a media facing surface and one or more fillet edges disposed adjacent to the first surface, wherein the magnetic media is disposed between the slider and the back plate, wherein a first surface of the magnetic media has a roughness of about 5 nm to about 100 nm, the first surface of the magnetic media facing the first surface of the back plate.
2. The data storage device of claim 1 , wherein an air film is disposed between the first surface of the back plate and the magnetic media, the magnetic media being spaced a distance from the first surface of the back plate between about 10 nm and about 300 nm.
3. The data storage device of claim 1 , wherein the one or more fillet edges are two fillet edges disposed adjacent to the first surface of the back plate, and wherein each of the fillet edges is an arc, a straight chamfer, or stepped.
4. The data storage device of claim 1 , wherein a first fillet edge of the one or more fillet edges is disposed between the first surface and a leading edge surface of the back plate, wherein the first fillet edge has length from the leading edge surface to the first surface between about 0.01 mm and about 0.50 mm.
5. The data storage device of claim 4 , wherein the first fillet edge has a curvature between about 0.2 mm R to about 5.0 mm R.
6. The data storage device of claim 4 , wherein the first fillet edge is recessed a depth of about 10 nm to about 1000 nm from the first surface of the back plate.
7. The data storage device of claim 4 , wherein the first fillet edge is disposed at an angle between the first surface of the back plate and the leading edge surface of about 0.01 degrees to 2.0 degrees.
8. The data storage device of claim 1 , wherein the data storage device is a tape embedded drive.
9. The data storage device of claim 1 , wherein an air film is disposed between the first surface of the back plate and the magnetic media, and wherein the air film forms due to at least the roughness of the first surface of the back plate, the roughness of the first surface of the magnetic media, and the one or more fillet edges.
10. A data storage device, comprising:
a magnetic recording head assembly configured to read from and write to a magnetic media, the assembly comprising:
a load;
a suspension coupled to the load; and
a slider coupled to the suspension, the slider comprising one or more read elements and one or more write elements; and
a back plate having one or more fillet edges disposed adjacent to the slider, the back plate comprising a first surface having a roughness between about 5 nm and about 100 nm, wherein the magnetic media is disposed between the slider and the back plate, the magnetic media comprising a first surface spaced a first distance from the slider and a second surface spaced a second distance from the first surface of the back plate, the second surface of the magnetic media having a roughness of about 5 nm to about 100 nm, wherein the one or more fillet edges cause an air film to be disposed between the second surface of the magnetic media and the first surface of the back plate, the air film supporting the magnetic media.
11. The data storage device of claim 10 , wherein a thickness of the air film and the second distance are determined by at least one of a velocity of the magnetic media and the one or more fillet edges of the back plate.
12. The data storage device of claim 10 , wherein a first fillet edge of the one or more fillet edges is disposed between a leading edge surface and a media facing surface of the back plate, the first fillet edge having a length from the leading edge surface to the media facing surface of about 0.01 mm to about 0.50 mm, and wherein a second fillet edge of the one or more fillet edges is disposed between a trailing edge surface and the media facing surface of the back plate, the second fillet edge having a length from the trailing edge surface to the media facing surface of about 0.01 mm to about 0.50 mm.
13. The data storage device of claim 12 , wherein the first and second fillet edges each have a curvature between about 0.2 mm R to about 5.0 mm R, an angle between the media facing surface to a surface of the first fillet edge of about 0.01 degrees to 2.0 degrees, or a recessed depth from the media facing surface of about 10 nm to about 1000 nm.
14. The data storage device of claim 10 , wherein the first distance is between about 5 nm and about 50 nm and the second distance is between about 10 nm and about 300 nm.
15. The data storage device of claim 10 , wherein the data storage device is a tape embedded drive.