Thermally assisted magnetic recording system
US7773331B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2007 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Sep 10, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The optimum head-field intensity for saturation recording is assumed to be 560×103 A/m or more. Under a condition where the recording track width of an information recording medium is equal to or less than 60 nm, the optimum head-field intensity Y satisfies the following inequalities (1) and (2):Y≧(X2−119×X+4135)×1000 (1)Y≦(X2−119×X+const)×1000 (2)where X denotes the nondimensional value of the recording track width divided by 10−9 m, and Y denotes a magnetic field (expressed in units of A/m) which a magnetic pole for head-field application applies to the center of the information recording medium in the direction of the thickness thereof. Note that const=−0.8×v2+33.7×v+4250 if the relative velocity v between the head and the medium at the position of the head is less than 20 m/sec, or const=4600 if the velocity v is equal to or more than 20 m/sec.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.