Figure 1

Figure 1: a) Magnetization curves for two Fe(t_Fe)-Cu(61Å)-Co(55Å)- Cu(36Å) sandwiches grown at 160 °C. The curve indicated by squares is for a t_Fe = 40Å sandwich grown on silicon, and the solid line is for a t_Fe = 16Å sandwich on glass. The plateau region in the t_Fe=40Å curve corresponds to the region where the Fe and Co moments are antialigned.

b) Transverse (applied field perpendicular to current) MR traces for two Fe(t_Fe)-Cu(61Å)-Co(55Å)-Cu(36Å) sandwiches both grown on semi-insulating silicon. The t_Fe=40Å sample is the one whose magnetization curve is shown in a). The t_Fe=16Å sample was deposited at the same time as the t_Fe=16Å sample on glass whose data are shown in a). The MR data for the t_Fe=16Å sample are multiplied by a factor of 10 for clarity. The MR is defined by Dr/r = [r_max - r(H=H_s)]/r(H=0).