Abstract
Fe was electrodeposited on (100), (110) and (111) Au single crystalline thin films, and the double-layered Fe/Au films were examined by electron microscope. In the initial stage of electrodeposition, disk crystalline nuclei of Fe formed on the Au substrates and as the electrodeposition proceeded, they grew epitaxially to form a continuous layer of 15∼20nm in mean thickness. Epitaxial relationships were as follows; (100)Au||(100)Fe [001]Au||[001]Fe, (110)Au||(110)Fe[001]Au/[110]Fe and (111)Au||(110)Fe‹110›Au||[001]Fe.
When the thickness of the Fe layer exceeded a critical value, interfacial dislocations, also known as misfit dislocations, were introduced into the interface between the Fe and Au layers. Edge type dislocations of Burgers vectors of a/2 ‹011› were formed in Fe/(100)Au, and mixed type dislocations of Burgers vectors of a/2 ‹110› were formed both in Fe/(110)Au and Fe/(111)Au. The critical thickness for introducing dislocations was estimated at 15∼20nm. Formation of the interfacial dislocations resulted in the relaxation of internal stress originating in the misfits between the Fe and Au lattices.
