Magnetism of Bct Iron Grown In (001) FeIr Superlattices

In this paper, we show that iron can be grown by MBE in a body centered tetragonal structure in (001) FeIr superlattices. The growth, structure and morphology of these superlattices are briefly resumed. A variation of the BCT Fe magnetic moment depending on the Jr thickness is observed. This variation is demonstrated to come from a variation of the BCT Fe atomic volume, due to the competition of the Fe and Ir stresses. A magnetic transition from a non-magnetic to a low spin ferromagnetic state depending on the atomic volume is thus observed.