Molecular beam epitaxy of CoxFe4−xN (0.4<x<2.9) thin films on SrTiO3(001) substrates

We attempted to grow CoxFe4−xN epitaxial thin films on SrTiO3(001) substrates by molecular beam epitaxy supplying solid Co and Fe and a radio frequency N2 plasma, simultaneously. The composition ratio of Co/Fe in CoxFe4−xN was controlled by changing the weight ratio of Co to Fe flakes in the crucible of the Knudsen cell used. We confirmed epitaxial growth of CoxFe4−xN (0.4

► Co3FeN has attracted attention because of its large spin polarization.
► We had already reported the epitaxial growth of Fe4N and Co4N films by MBE.
► In this work, CoxFe4−xN (0.4