Magnetic recording medium, magnetic signal reproduction system and magnetic signal reproducing method
AssigneeFUJIFILM Corporation
InventorsToshio TADA, Takeshi Harasawa
Life of this patent
Estimating the term…
Abstract
The present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, wherein the magnetic layer has a thickness δ ranging from 10 to 80 nm, a product, Mrδ, of a residual magnetization Mr of the magnetic layer and the thickness δ of the magnetic layer is equal to or greater than 1 mA but less than 5 mA, a ratio, Sdc/Sac, of an average area Sdc of magnetic clusters in a DC demagnetized state to an average area Sac of magnetic clusters in an AC demagnetized state as measured by a magnetic force microscope, MFM, ranges from 0.8 to 2.0.
Claims12
1-10. (canceled)
A method of manufacturing a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, the method comprising:
- forming the magnetic layer by coating and drying a magnetic layer coating liquid comprising the binder and the ferromagnetic powder on the nonmagnetic support, the ferromagnetic powder in the magnetic coating liquid having a particle size distribution such that a diameter of the particles constituting 95 percent of the cumulative volume, D95, is equal to or less than 70 nm.
Dependencies are inferred from the claim text.