Abstract
We have used x-ray magnetic circular dichroism (XMCD) to determine the spin and orbital magnetic moments of Fe atoms at the ferromagnetic/superparamagnetic boundary, superparamagnetic thickness, and submonolayer thickness at the interface. The samples, grown by molecular beam epitaxy at room temperature, were 5, 4, and 0.5 ML (monolayer) Fe on GaAs (100)-4×6 capped with 7 ML Cr, preceded in the case of the 0.5 ML Fe by 9 ML Co. The XMCD results show orbital moments enhanced by almost 300% with respect to the bulk and bulklike spin moments for all three thicknesses demonstrating unambiguously that the Fe/GaAs interface is magnetic.
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