Abstract
The magneto-optic Kerr effect in-situ has been used to investigate the effects of exposing ultrathin Co/Cu(llO) films (6ML<d<sub><Co</sub><30ML) to CO gas and the subsequent effects of depositing submonolayer quantities of Cu. After a given deposition of CO, the adsorption of CO gas (but, not O<sub>2</sub>, H<sub>2</sub>) is found to cause the magnetic easy axis to switch 90° from the [00l] to the [1-10] direction. The deposition of submonolayer Cu overlayers are observed to reverse the effect of the adsorbed CO thereby switching the easy axis back to [00l]. For thin CO films (d<sub>Co</sub><15ML), Cu overlayers switch the magnetic easy axis back to the [00l] direction abruptly. In thicker CO films (>15ML) the easy axis is found to shift gradually from the [l-10] to the [00l] direction, and it allows us to controllably engineer the direction of the magnetic easy axis at a constant CO thickness.
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