Abstract
We set out to compare the ferromagnetic behavior of FexNi(1−x) and CoxNi(1−x) films of varying stoichiometry epitaxially grown on Cu(100). The thickness chosen was 5 ML over a wide alloy composition range. Using a scaling law for the thickness vs Curie temperature, we extrapolate the bulk fcc film thickness and plot the bulk fcc Curie temperature as a function of composition. The results suggest (a) that the Invar effect is quenched in these ultrathin pseudomorphic fcc films of FexNi(1−x) alloys and (b) the magnetic phase of Fe atoms is the low-spin ferromagnetic phase. The CoxNi(1−x) films show the expected monotonic decrease in Tc with increasing Ni content.
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