Abstract

Epitaxial sesquilayers (sesqui = one and a half) of Fe(1 1 0), prepared near room temperature on W(1 1 0), are composed of a pseudomorphic monolayer sea which is ferromagnetically magnetized in the plane below its Curie temperature T c(ML) = 222 K, and a system of pseudomorphic double layer islands which just after preparation are perpendicularly magnetized at room temperature. During exposure to residual gas, the double-layer islands switch to in-plane magnetization. This adsorption-driven spin reorientation transition is studied using torsion oscillation magnetometry (TOM), for the case of a sesquilayer consisting of 1.46 pseudomorphic layers, prepared at 325 K.

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