US 6,835,451 B2
Magnetic recording mediumGeneral
US 6,835,451 B2
Magnetic recording medium
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:
Kiyomi Ejiri
Assignee:
Priority:
09/13/02
Filed:
09/12/03
Granted:
12/28/04
Expiration:
09/12/23
Abstract
Provided is a magnetic recording medium which has excellent electromagnetic characteristics in an MR head and which is suited to high-density digital recording, especially suited to reproduction in an MR head. The magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. The magnetic layer has a residual magnetization &PHgr;r ranging from 5 to 50 mA, and ratio (Sdc/Sac) of average area Sdc of magnetic clusters under DC magnetized condition to average area Sac of magnetic clusters under AC erased condition ranges from 0.8 to 2.0.
Cooperative Patent Classification (CPC)
G11G11B5/714G11B