Abstract
A magnetic phase diagram for Si/Co/Ir(111) films has been established by the surfacemagneto-optic Kerr effect technique. The Si coverage, where ferromagnetism vanishes,increases from one monolayer to more than three monolayers as the coverageof the Co layer increases from two to five monolayers. As silicon is depositedon the surface of Co/Ir(111) films, Si atoms interact with the Co layer to formSi–Co compounds. The rough Si/Co interface impedes the motion of domain wallsduring the magnetization reversal process, thus increasing the coercive force. Theformation of nonmagnetic Co–Si compounds reduces the effective magnetic layers,leading to a decrease in Kerr intensity and superparamagnetic behavior of the films.
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