Giant magnetoresistive effect sensor, particularly having a mult

Details Giant magnetoresistive effect sensor, particularly having a mult Giant magnetoresistive effect sensor, particularly having a mult

1995-08-31

1997-07-15

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Head

Hall effect

338 32R, 324252, G11B 539

Patent

active

056488858

ABSTRACT:
A spin-valve read head of the giant magnetoresistive type in a data storage system has at least one magnetic thin film layer comprising a plurality of magnetic thinner film layers of ferromagnetic material with the same crystal plane orientation from one magnetic thinner film to another, and an interface between adjacent magnetic thinner films having a discontinuity in single-crystal epitaxial growth. Each magnetic thinner film layer is composed of an alloy including each of Fe, Ni and Co and has a weight ratio of Co:Fe equal to 90:10. The crystal has a crystal structure that is face centered cubic and a crystal plane orientation (111) that is highly ordered. The interfaces may be layers of Ni or Cu. The layers all exhibit a condition of magnetic orientation and annealed structure resulting from being annealed and cooled in a magnetic field sufficiently to have an anisotropic energy of the first magnetic thin film layer in an equilibrium state that is smaller than an identical structure before annealing.

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R.L. White, "Giant Magnetoresistance: A Primer", IEEE Transactions on Magnetics, vol. 28, No. 5, Sep. 1992, pp. 2482-2487.
Ultrathin Magnetic Structures II, "Measurement Techniques and Novel Magnetic Properties", Springer-Verlag, 1994, pp. 174-194.

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