Magnetic multilayered film, magnetoresistance effect element and

Details Magnetic multilayered film, magnetoresistance effect element and Magnetic multilayered film, magnetoresistance effect element and

1997-06-12

1999-09-28

Kilman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428694T, 428693TS, 428694TM, 428141, 428900, 360113, G11B 566

Patent

active

059586117

ABSTRACT:
According to the present invention, a magnetic multilayered film includes an oxide antiferromagnetic layer, a pinned ferromagnetic layer which is pinned by the oxide antiferromagnetic layer, a non-magnetic metal layer and a free ferromagnetic layer which are stacked on a substrate in order. A surface roughness Ra of the oxide antiferromagnetic layer at the side of the pinned ferromagnetic layer is set to no greater than 0.6 nm, and a crystal grain size D of the oxide antiferromagnetic layer is set to a value in the range of 10 to 40 nm. Thus, the magnetic multilayered film has the large exchange-coupling magnetic field and MR ratio and MR sensitivity. The magnetic multilayered film may be applied to a magnetoresistance effect element which may also applied to a magnetoresistance device, such as, a magnetoresistance effect type head. The magnetoresistance effect element having such a magnetic multilayered film is capable of obtaining high outputs. The magnetoresistance effect type head having such a magnetoresistance effect element which is excellent in current efficiency and capable of detecting signals magnetically recorded in high density, particularly in ultrahigh density exceeding 3 Gbit/inch.sup.2 and further obtaining large outputs.

REFERENCES:
patent: 4949039 (1990-08-01), Gruenberg
B. Dieny, et al., "Giant Magnetoresistance In Soft Ferromagnetic Multilayers", Physical Review B, vol. 43, No. 1, Jan. 1, 1991, pp. 1297-1300. Multilayers (M=Ni.sub.80 Fe.sub.15 Co.sub.5, Ni.sub.80 Co.sub.20, Co.sub.90 Fe.sub.10)", Jpn. J. Appl. Phys., vol. 32, Part 2, No. 10A, Oct. 1, 1993, pp. 1441-1443.
T. Lin, et al. "Improved Exchange Coupling Between Ferromagnetic Ni-Fe and Antiferromagnetic Ni-Mn-Based Films", J. Appl. Phys. Lett., vol. 65, No. 9, Aug. 29, 1994, pp. 1183-1185.
F. Koike, et al., "Spin Valve GMR Films with Antiferromagnetic .sigma.-Fe.sub.2 O.sub.3 Film", Journal of Jpn. Appl. Mag., vol. 20, No. 2, 1996, pp. 365-368.

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