Magnetic recording medium comprising two magnetic layers of hexagonal ferrite magnetic particles and binder wherein the easy axes of the particle is specified
US5419938A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1993 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Jun 30, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/257
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium includes a coated type of magnetic layer containing magnetic powders substantially made up of hexagonal ferrite particles and a binder, and has the values of EQU SQR.sub.x .gtoreq.0.50 EQU SQR.sub.y .ltoreq.0.35 where SQR.sub.x is the squareness ratio of said magnetic layer in the recording track direction, and SQR.sub.y is the intra-surface squareness ratio of said magnetic layer in the direction perpendicular to the recording track direction, and has also the value of EQU .alpha..gtoreq.3% where .alpha. is given by EQU .alpha.=I(006).times.100/I(%) where I is the peak intensities, I(hkl), of the (hkl) planes of said magnetic layer upon X-ray diffraction, defined by EQU I=I(006)+I(110)+I(107)+I(114)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.