MAGNETIC AND TRANSPORT-PROPERTIES OF NONEQUILIBRIUM BCC EU-FE ALLOYS

We prepared non-equilibrium Eu-Fe alloy thin films by co-evaporation, and studied their structural, magnetic and transport properties. The m agnetization of the Eu-rich Eu-Fe alloy exhibits a small, but distinct kink at an external field of about 80 kOe and the magnetoresistance c hanges from positive to negative values at this field. We interpret th at this anomaly is due to breakdown of the helical spin structure of E u by the addition of Fe.