Magnetic recording medium

• US 7,014,927 B2
• Filed: 12/18/2003
• Issued: 03/21/2006
• Est. Priority Date: 12/27/2002
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Suzuki, Ryota, Sueki, Minoru
• Primary Examiner(s): Resan, Stevan A.
• Application Number:
  US10/738,308
• Publication Number:
  US 20040131892A1
• Time in Patent Office: 824 Days
• Field of Search: 428/141, 428/328, 428/336, 428/694.BR, 428/842
• US Class Current: 428/842
• CPC Class Codes: G11B 5/70 on a base layer

Abstract

A magnetic recording medium comprising: a support; and at least one magnetic layer containing a ferromagnetic powder and a binder, wherein a center line average roughness of the magnetic layer measured with a laser interferometer is from 1 to 3 nm, a skewness is 0 or more and less than 1.0, and a maximum difference of elevation of peak/valley is 50 nm or less.

Claims

1. A magnetic recording medium comprising:

a support; and

at least one magnetic layer containing a ferromagnetic powder and a binder,

wherein a center line average roughness of the magnetic layer measured with a laser interferometer is from 1 to 3 nm, a skewness is 0 or more and less than 1.0, and a maximum difference of elevation of peak/valley is 50 nm or less.

2. The magnetic recording medium according to claim 1, wherein the magnetic layer has a thickness of from 0.01 to 0.15 μ

m.

3. The magnetic recording medium according to claim 1, wherein the magnetic layer has a thickness of from 0.05 to 0.13 μ

m.

4. The magnetic recording medium according to claim 1, which further comprises a nonmagnetic layer so that the magnetic layer, the nonmagnetic layer and the support are in this order.

5. The magnetic recording medium according to claim 1, wherein the magnetic layer has a coercive force of from 159 to 318 kA/m.

6. The magnetic recording medium according to claim 1, wherein the magnetic layer has a coercive force of from 2,000 to 4,000 Oe.

7. The magnetic recording medium according to claim 1, wherein the center line average roughness of the magnetic layer measured with a laser interferometer is from 2.0 to 3.0 nm.

8. The magnetic recording medium according to claim 1, wherein the skewness is 0 or more and less than 0.5.

9. The magnetic recording medium according to claim 1, wherein the maximum difference of elevation of peak/valley is 40 nm or less.