Abstract
Abstract In this paper, we exploit the high sensitivity of the magnetism of ultrathin Co/Au(111) layer to study the electrochemical interface structure. Using in situ real time magnetic measurements (polar magneto-optical Kerr effect, PMOKE) it is established that the surface chemistry determines the surface magnetization anisotropy energy K S Surf and thereby the direction of magnetization at a given thickness. We next demonstrate that the magnetic properties are strongly modified by the hydrogen evolution reaction (HER) at CO-covered layers and exploit the data to study the reaction mechanism. We also take advantage of the sensitivity of K S Surf to the electric field to discuss the structure of the electrochemical interface at H- and CO-covered cobalt surfaces.
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