Magnetic recording medium
View Patent ↗A magnetic recording medium exhibits reduced magnetic flux modulation and improved signal-to-noise ratio. The magnetic recording medium may take the form of a magnetic tape or a magnetic disk. Providing a magnetic recording layer with a more uniform thickness can improve the magnetic flux modulation characteristic. For example, the magnetic recording medium may have a coercivity of greater than or equal to 2000 Oerstads with a magnetic flux modulation characteristic having a one sigma standard deviation of less than 0.06. In some cases, the magnetic flux modulation characteristic may have a one sigma standard deviation of less than 0.05, or even 0.04. Reduced magnetic flux modulation can support increased storage densities.
1. A magnetic recording medium comprising:
a substrate; and
a magnetic recording layer formed over the substrate,
wherein the magnetic recording layer has an Mr Delta expressed in milli-electromagnetic units per centimeter squared (memu/cm 2 ) between approximately 1.19 and 2.58 memu/cm 2 with a standard deviation of the Mr Delta between approximately 0.034 and 0.07 memu/cm 2 .
2. The magnetic recording medium of claim 1 , wherein the magnetic recording layer has an average thickness of less than or equal to approximately 0.15 microns.
3. The magnetic recording medium of claim 1 , wherein the magnetic recording layer has an average thickness of less than or equal to approximately 0.10 microns.
4. The magnetic recording medium of claim 1 , wherein the magnetic recording layer exhibits a coercivity of greater than approximately 2000 Oerstads.
5. The magnetic recording medium of claim 1 , wherein the magnetic recording layer has a coercivity of greater than approximately 2300 Oerstads.
6. The magnetic recording medium of claim 1 , wherein the magnetic recording medium is a magnetic recording tape.
7. The magnetic recording medium of claim 1 , wherein the magnetic recording layer includes metal magnetic particles dispersed in a polymeric binder.
8. The magnetic recording medium of claim 1 , wherein the standard deviation of the Mr Delta is less than or equal to approximately 0.05 memu/cm 2 .
9. The magnetic recording medium of claim 1 , wherein the standard deviation of the Mr Delta is less than or equal to approximately 0.04 memu/cm 2 .
10. The magnetic recording medium of claim 1 , further comprising a carrier layer formed between the substrate and the magnetic recording layer, wherein the magnetic recording layer has a thickness of less than approximately 0.15 microns.
11. The magnetic recording medium of claim 1 , wherein the Mr Delta is equal to approximately 2.17 memu/cm 2 .
12. A magnetic recording medium comprising:
a substrate;
a carrier layer formed over the substrate; and
a magnetic recording layer formed over the carrier layer,
wherein the magnetic recording layer has an average thickness of less than or equal to 0.15 microns, a coercivity of greater than 2000 Oerstads and an Mr Delta expressed in milli-electromagnetic units per centimeter squared (memu/cm 2 ) between approximately 1.19 and 2.58 memu/cm 2 with a standard deviation of the Mr Delta between approximately 0.034 and 0.07 memu/cm 2 .
13. The magnetic recording medium of claim 12 , wherein the magnetic recording layer has an average thickness of less than or equal to approximately 0.10 microns.
14. The magnetic recording medium of claim 12 , wherein the magnetic recording layer exhibits a coercivity of greater than approximately 2000 Oerstads.
15. The magnetic recording medium of claim 12 , wherein the magnetic recording layer has a coercivity of greater than approximately 2300 Oerstads.
16. The magnetic recording medium of claim 12 , wherein the magnetic recording medium is a magnetic recording tape.
17. The magnetic recording medium of claim 12 , wherein the magnetic recording layer includes metal magnetic particles dispersed in a polymeric binder.
18. The magnetic recording medium of claim 12 , wherein the standard deviation of the Mr Delta is less than or equal to approximately 0.05 memu/cm 2 .
19. The magnetic recording medium of claim 12 , wherein the standard deviation of the Mr Delta is less than or equal to approximately 0.04 memu/cm 2 .