Abstract
Co-Fe/Cu multilayers having Cu layer thickness in the second peak of MR oscillation were fabricated under a sputtering atmosphere with a small amount of oxygen introduced as an impurity. Their giant magnetoresistance effect was investigated as a function of the partial pressure of oxygen introduction, PO2, from 3×10-10 Torr to 1×10-6 Torr. Magnetoresistance (MR) ratio increased with increasing PO2 up to 5×10-8 Torr. The surface roughness decreased from 6 A to 2 A with increasing PO2. Such changes of MR ratio and surface roughness versus PO2 correspond closely to the changes in Co/Cu multilayers having Cu layer thickness in the first peak of MR oscillation. The maximum field sensitivity of 0.28 % / Oe was obtained at PO2 = 1×10-7 Torr.
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