US 6,896,959 B2
Magnetic recording medium having narrow pulse width characteristicsGeneral
US 6,896,959 B2
Magnetic recording medium having narrow pulse width characteristics
Tech Center:
1700 Chemical and Materials Engineering
Examiner:
Stevan A. Resan
Art Unit:
1773 Chemical Apparatus, Separation and Purification, Liquid and Gas Contact Apparatus
Agent:
Inventors:
Bruce H. Edwards
Assignee:
Priority:
05/19/03
Filed:
05/19/03
Granted:
05/24/05
Expiration:
05/19/23
Abstract
A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer, wherein the magnetic layer contains a volume concentration of at least about 35% of a magnetic metallic particulate pigment having a coercivity of at least about 2000 Oersteds (Oe), and a binder system for the pigment. The magnetic recording medium exhibits an orientation ratio greater than 2.0, a pulsewidth (PW50) value of less than about 500 nm, and a remanence-thickness product, Mr*t, of less than about 5.0 memu/cm2.
Cooperative Patent Classification (CPC)
G11G11B5/7356G11BY10T428/257Y10T