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Magnetic head and magnetic storage apparatus using the same

Imported: 23 Feb '17 | Published: 22 Oct '02

Yoji Maruyama, Yoshio Suzuki, Ryoichi Nakatani, Hisashi Takano

USPTO - Utility Patents

Abstract

It is the object of the invention to provide a magnetic head and a magnetic storage apparatus using the magnetic head provided with a signal reproducing means which is capable of using the same signal processing circuit as used for the conventional longitudinal magnetization film type recording medium even when a perpendicular magnetization film type recording medium is used. Because the present invention renders the reproducing signal generated from a perpendicular magnetization film Gaussian shaped (Lorentzian pulse), the same signal processing circuit as used for the conventional longitudinal magnetization film type recording medium can be used. To accomplish this object, in the reproducing means which is the component of the information reproducing component of the magnetic head, the first spin valve element and the second valve element are piled up, the magnetization direction of pinned layers of both elements is prescribed so as to be antiparallel each other, and lead electrodes of both elements are connected so as to be common. When two spin valve elements are piled up to compose a reproducing means, the first spin valve element is structured so as to have an Ru film between the first ferromagnetic film and the second ferromagnetic film and so as to have a Cu film between the second ferromagnetic film and the third ferromagnetic film, and the second spin valve element is structured so as to have a Cu film between the fourth ferromagnetic film and the fifth ferromagnetic film. These two elements are piled up with interposition of a desired spacer film adjacently.

Description

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1A is a perspective view for illustrating the structure of a reproducing means of one example of the present invention.

FIG. 1B is a sectional view of the reproducing means taken along the line in FIG.

1A.

FIG. 1C is a sectional view of the reproducing means taken along the line in FIG.

1A.

FIG. 1D is a sectional view for illustrating piling up of spin valve elements

33 and

34 taken along the line in FIG.

1A.

FIG. 2 is a perspective view for illustrating a reproducing component

22 and recording component

21 of a conventional magnetic head.

FIG. 3 is a plan view of a magnetic recording apparatus provided with a reproducing means to which the present invention is applied as a reproducing component of a magnetic head.

FIGS. 4A and 4B are diagrams for describing the principle of the head using dual MR as a reproducing means.

FIG. 5A is a perspective view for illustrating the structure of a reproducing means of the second example of the present invention.

FIG. 5B is a sectional view for illustrating piling up of piled up two spin valve elements

33 and

34 in FIG.

5A.

FIG. 5C is a diagram of a circuit for processing signal outputted from piled up two spin valve elements

33 and

34 in FIG.

5A.

FIG. 6A, FIG. 6B, and FIG. 6C are schematic diagrams for describing operational principle of the present invention comprising piled up two spin valve elements

33 and

34.

FIG.

7A and FIG. 7B are diagrams for describing operational principle of a reproducing means of one example of the present invention.

FIG. 8 is a diagram for describing operational principle of a reproducing means of another example of the present invention.

FIG. 9 is a sectional view of a spin valve element which is a component of the reproducing component of another example of the present invention.

FIG.

10A and FIG. 10B are diagrams for describing magnetization of two spin valve elements

33 and

34.

FIG.

11A

1 and FIG.

11A

2 are diagrams for describing principle for changing pinned layer magnetization antiparallel of the spin valve element

34.

FIG.

11B

1 and FIG.

11B

2 are diagrams for describing principle for changing pinned layer magnetization antiparallel of the spin valve element

33.

FIG.

12A and FIG. 12B are diagrams for describing operational principle of a reproducing component of the present invention.

FIG. 13 is a sectional view for illustrating a reproducing means comprising a piled up two spin valve elements of another example of the present invention.

Claims

1. A magnetic storage apparatus comprising:

2. The magnetic storage apparatus according to claim 1, wherein said first non-magnetic medium layer consists of any one of metal layers selected from a group of Ru, Rh, Ir, Cr, and Cu or consists of an alloy containing some of these metals.

3. The magnetic storage apparatus according to claim 1, wherein said second non-magnetic film and said third non-magnetic film comprise a Cu layer.

4. The magnetic storage apparatus according to claim 1, wherein the magnetization direction of said first ferromagnetic film and said third ferromagnetic film is prescribed to be in the same direction.

5. The magnetic storage apparatus according to claim 1, wherein the magnetization direction of said first ferromagnetic film and said third ferromagnetic film is prescribed by antiferromagnetic films or hard magnetic films which are respectively in contact with both said first ferromagnetic film and said third ferromagnetic film.