Our findings provide insights into the atomic-scale f~~n d a m e n t a l processes of ultra-thin film lubrication, thus extending continuum EHL and micro-EHL treatments into the nanometer realm. Such investigations address some issues facing certain current novel technologies [such as high-density information storage and retrieval systems (20) and provide the impetus for future experimental and theoretical investigations.

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Adsorbate and thermally induced changes of the spin reorientation transition in Fe wedges grown at 140 K on Cu͑001͒ substrates are investigated by the magneto-optical Kerr effect and Kerr microscopy. The adsorption of oxygen causes a complete reorientation of the easy axis of magnetization into the film plane. In contrast to that carbon monoxide decreases the critical thickness for the reorientation transition of the film by 0.7 monolayer down to 3.6 monolayers, while films thinner than 3.6 monolayers remain magnetized perpendicularly. These adsorbate-induced changes can be ascribed to a change in the surface magnetic anisotropy. Also annealing of the films up to 300 K causes a temperature-dependent nonlinear shift of the critical thickness. This shift can be separated in reversible and irreversible contributions which arise from temperature-dependent anisotropy constants and thermally induced structural changes of the film, respectively.