New phenomena of magnetoresistance in ferrimagnetic Fe/Gd multilayers

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Abstract
A new type of magnetoresistance characterized by its anomalous field dependence has been found in artificially multilayered ferrimagnets of Fe/Gd and of modified double-structured {Fe/Gd}/{Fe/Gd}. The anomaly is attributed to the spin-flop which remarkably takes place at fields less than 1 kOe even at room temperature and is particularly pronounced in the double-structured multilayers. In coincidence with the spin-flop, the magnetoresistance shows an up and down change against field.