IP Library › Granted Patent US 6,893,702
Granted Patent B2
US 6,893,702 · App. 10/760,919 · Granted May 17, 2005

Magnetic recording medium substrate, method of producing the same, and method of evaluating magnetic recording medium

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Quick Facts
Patent No.
US 6,893,702
App. No.
10/760,919
Granted
May 17, 2005
Kind
B2
Abstract

The present invention relates to a substrate for a magnetic recording medium that ensures a floating height on a magnetic head. This substrate is made of a sintered body provided with pores having a diameter in the range of 0.05 μm to 2.0 μm extending across 5% to 50% of the surface area of the substrate.

Claims (5)

1. A substrate for a magnetic recording medium, comprising a sintered body of aluminum particles provided with pores having a diameter in a range of 0.05 μm to 2.0 μm extending across 5% to 50% of a surface area thereof.

2. The substrate of claim 1 comprising aluminum particles with lead stearate.

3. The substrate of claim 1 comprising pore-forming material selected from the group consisting of lead, copper, magnesium, nickel, zinc, tin, manganese, silicon, glass and resin.

4. The substrate of claim 3 , wherein said pore-forming material comprises lead particles having a diameter of about 0.1 μm to about 2.0 μm, blended at a proportion of 5% to 50% with respect to the surface area of the substrate.

5. The substrate of claim 1 having average roughness Ra of about 0.1 nm.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 4, 2010
From: FUJITSU LIMITED
To: SHOWA DENKO K.K.
Reel/Frame 023950/0008 →