Abstract
The influence of annealing on the giant magnetoresistance effect in [bcc-Fe (Co, Ni)/Cu] multilayers was investigated from the standpoint of the structure, especially the preferred orientation of magnetic layers. Samples were prepared on an MgO (001) single crystal with an Fe (Co) or Fe (Ni) alloy buffer layer by an ion-beam sputtering (I.B.S.) method. The MR ratio of both [Fe (Co)/Cu] and [Fe (Ni)/Cu] multilayers increased to 53.6% and 42.3% after annealing at 200°C for 28 hours and 300°C for 2 hours, respectively. It should be emphasized that the preferred oriention of Fe (M) is (001) and that Cu shows a bct structure. The MR ratio of [bcc/fcc] multilayers increased as a result of annealing bacause of the increase in the preferred orientation of the magnetic layer.
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