Claims
- 1. A magnetic recording disk apparatus comprising:a magnetic head including a magnetic pole made of a material with a resistivity ρ(μΩ-cm) and with a relative permeability μ, wherein said ρ, said μ, and d(μm) which is the thickness of said magnetic pole, satisfies the relation ∞d2/ρ≦500.
- 2. A magnetic recording disk apparatus according to claim 1, wherein said magnetic head includes a reproduction head having at least one of a magneto-resistive effect element, a spin-valve element and a giant magneto-resistive element.
- 3. A magnetic head comprising:a magnetic pole made of a material with a resistivity ρ(μΩ-cm) and with a relative permeability μ, wherein said ρ, said μ, and d(μm) which is the thickness of said magnetic pole, satisfies the relation μd2/ρ≦500.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-082864 |
Apr 1994 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation application of U.S. Ser. No. 09/557,002 filed Apr. 20, 2000, now U.S. Pat. No. 6,297,929, which is a continuation of U.S. Ser. No. 09/003,506 filed Jan. 6, 1998, now U.S. Pat. No. 6,064,546, which is a continuation of U.S. Ser. No. 08/422,928 filed Apr. 17, 1995, abandoned.
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Continuations (3)
|
Number |
Date |
Country |
Parent |
09/557002 |
Apr 2000 |
US |
Child |
09/860645 |
|
US |
Parent |
09/003506 |
Jan 1998 |
US |
Child |
09/557002 |
|
US |
Parent |
08/422928 |
Apr 1995 |
US |
Child |
09/003506 |
|
US |