Abstract
The surface sensitivity of spin-resolved appearance potential spectroscopy (APS) was exploited to investigate the magnetic properties of ultrathin Fe layers on W(110). The spin asymmetry, used to monitor the magnetic moment within the probing depth of APS, was studied as a function of the Fe film thickness. The spin asymmetry data reveal a pronounced maximum at a film thickness of $\ensuremath{\approx}6$ monolayers (ML), which is attributed to the complex film morphology in this thickness range. For thicker, structurally relaxed films, APS measurements with variable sampling depth show the Fe surface magnetic moments enhanced compared with the moments of the sublayers. The spin asymmetry data are analyzed within a simple model.
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