Magnetic media with readable topographical features in combination with a slider-mounted non-magnetic transducer
View Patent ↗Magnetic patterned media comprise topographical features readable with a slider-mounted non-magnetic transducer sensitive primarily to a local aerodynamic boundary condition, in addition to a magnetic recording layer substantially conforming to the topographical features. Passage of a transducer over the features generates effects that can be detected in, and separated from, the magnetic recording signal.
1. In combination,
a) a recording medium having a magnetic recording layer substantially conforming to a substrate having topographical features, wherein the topographical features extend above a surface of the substrate to readably affect a local aerodynamic boundary condition, the topographical features extend above the surface to a height that is greater than or equal to approximately five nanometers and less than or equal to approximately one hundred nanometers, and an arrangement of the topographical features on the substrate defines a data signal; and
b) a slider-mounted non-magnetic transducer sensitive primarily to the local aerodynamic boundary condition to read the topographical features.
2. The combination of claim 1 , further comprising a magnetic transducer to magnetically interact with the medium.
3. The combination of claim 2 , in which the topographical features lie below a height at which the magnetic transducer may travel over, and magnetically interact with, the magnetic recording layer.
4. The combination of claim 1 , in which the local aerodynamic boundary condition affects temperature.
5. The combination of claim 1 , in which the local aerodynamic boundary condition affects pressure.
6. The combination of claim 1 , wherein the features extend above the surface to a height that is less than or equal to approximately fifty nanometers.
7. The combination of claim 1 , wherein the medium stores data as magnetization patterns within the magnetic recording layer.
8. The combination of claim 1 , wherein the magnetic recording layer of the medium is continuous over a plurality of the features.
9. In combination,
a) a recording medium having a magnetic recording layer substantially conforming to a substrate having topographical features, wherein the topographical features extend below a surface of the substrate to readably affect a local aerodynamic boundary condition, the topographical features extend below the surface to a depth that is greater than or equal to approximately twenty nanometers and less than or equal to approximately one hundred and fifty nanometers, and an arrangement of the topographical features on the substrate defines a data signal; and
b) a slider-mounted non-magnetic transducer sensitive primarily to the local aerodynamic boundary condition to read the topographical features.
10. The combination of claim 9 , further comprising a magnetic transducer to magnetically interact with the medium.
11. The combination of claim 10 , in which the topographical features lie below a height at which the magnetic transducer may travel over, and magnetically interact with, the magnetic recording layer.
12. The combination of claim 9 , in which the local aerodynamic boundary condition affects temperature.
13. The combination of claim 9 , in which the local aerodynamic boundary condition affects pressure.
14. The combination of claim 9 , wherein the medium stores data as magnetization patterns within the magnetic recording layer.
15. The combination of claim 9 , wherein the magnetic recording layer of the medium is continuous over a plurality of the features.