Abstract
The commensurate antiferromagnetic order of ${\mathrm{Cr}}_{94}{\mathrm{Fe}}_{6}$ alloy layers in epitaxial ${\mathrm{F}\mathrm{e}/\mathrm{C}\mathrm{r}}_{94}{\mathrm{Fe}}_{6}(001)$ superlattices was investigated by transport and magnetization techniques. N\'eel temperature ${T}_{N}$ values are strongly thickness dependent, with ${T}_{N}$ suppressed for ${\mathrm{Cr}}_{94}{\mathrm{Fe}}_{6}$ thicknesses 36 \AA{}. Transport results indicate a broadening of the transition with an onset temperature ${T}_{0}{T}_{N}$ by \ensuremath{\approx}150 K for all samples. The biquadratic interlayer coupling of the Fe layers is enhanced for ${T}_{N}T{T}_{0}$ and suppressed below ${T}_{N}.$ ${T}_{0}$ and ${T}_{N}$ are identified with the onset on cooling of inhomogeneous and homogeneous order, respectively, within the spacer layers. The regime of inhomogeneous ordering of the spacer is believed to promote biquadratic coupling because of the dominance of interfacial exchange energies.
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