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Recently, perpendicular magnetic anisotropy (PMA) and its voltage control(VC) was demonstrated for Cr/Fe/MgO (Physical Review Applied 5, 044006 (2016)).In this study, we shed a light on the origin of large voltage-inducedanisotropy change in Cr/Fe/MgO. Analysis of the chemical structure of Cr/Fe/MgOrevealed the existence of Cr atoms in the proximity of the Fe/MgO interface,which can affect both magnetic anisotropy (MA) and its VC. We showed that PMAand its VC can be enhanced by controlled Cr doping at the Fe/MgO interface. ForCr/Fe (5.9 {\AA})/Cr (0.7 {\AA})/MgO with an effective PMA of 0.8 MJ/m3, amaximum value of the voltage-controlled magnetic anisotropy (VCMA) effect of370 fJ/Vm was demonstrated.

Enhancement of perpendicular magnetic anisotropy and its electric field-induced change through interface engineering in Cr/Fe/MgO