Moment divergence from Slater-Pauling curve of epitaxial Co100−xMnx films on MgO(001)

The magnetic moment of epitaxial Co_100−xMn_x films grown on MgO(0 0 1) at low Mn concentration region diverging from Slater-Pauling curve is investigated. We grew Co_100−xMn_x (0 ≤ x ≤ 30) on MgO(0 0 1) substrates by molecular beam epitaxy and measured their structural and magnetic properties. Our results reveal the moment diverging from Slater-Pauling curve of Co_100−xMn_x films grown on MgO(0 0 1) at low Mn concentration is due to a structure transition. Anomalous Hall effect (AHE) study of Co₉₀Mn₁₀ films with different crystal structure confirmed this relation between magnetism and structure, the intrinsic part of AHE clearly shows the competition between different phases. Our quantitative analysis has made a further understanding of the moment diverging from Slater-Pauling curve found in Co_100−xMn_x films at low Mn concentration.