Abstract
We report a combined reflectance difference spectroscopy and scanning tunneling microscopy study revealing the extreme sensitivity of the magnetic properties of Ni films on $\text{Cu}(110)\text{\ensuremath{-}}(2\ifmmode\times\else\texttimes\fi{}1)\text{O}$ near the spin reorientation transition. Upon completion of the ninth contiguous Ni monolayer (ML) the magnetic easy axis switches from in-plane to out-of-plane within a narrow thickness range of at most 0.1 ML. In addition, we find that the reversible adsorption of CO completely quenches the out-of-plane magnetization of these Ni films. As little as 0.1 L of CO is sufficient for spin reorientation at a film thickness of 9.1 ML.
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