Spin valve magnetic properties with oxygen-rich NiO underlayer

Details Spin valve magnetic properties with oxygen-rich NiO underlayer Spin valve magnetic properties with oxygen-rich NiO underlayer

2005-03-15

2005-03-15

Heinz, A. J. (Department: 2653)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

06867951

ABSTRACT:
In a spin valve, an underlayer is made of oxygen-rich nickel oxide to enhance the giant magnetoresistive ratio (ΔR/R). The oxygen-rich nickel oxide film is made using reactive sputtering of a nickel target in an oxygen-rich sputtering atmosphere consisting substantially of pure oxygen and argon gases. The total pressure of the oxygen-rich atmosphere is reduced during the oxygen-rich nickel oxide film formation to additionally enhance the ΔR/R value. A spin valve including two adjacent oxygen-rich nickel oxide underlayers provides a higher ΔR/R ratio at a given pinning strength Huathan does a spin valve having only one oxygen-rich nickel oxide underlayer.

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