INVESTIGATIONS FOR THE EXISTENCE OF AN IRON-OXIDE LAYER AT THE MGO/FE INTERFACE

Abstract

We have investigated the possibility of an interface between MgO and Fe films to explore the existence of ail oxide layer at the MgO/Fe interface as a preliminary system of Fe/MgO/Fe magnetic tunnel junctions. By using photoemission spectroscopy and X-ray absorption spectroscopy, we found that no iron-oxide layer existed at the interface for the in-situ-grown epitaxial MgO(001)/Fe(001) bilayer on a W(001) substrate. Moreover, we showed that metal Mg could revivify the iron-oxide to metal Fe when MgO was formed. These results show we can make iron-oxide-free samples in the Mg-rich growth condition.