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We investigated the effect of Fe segregated from partially Fe-substituted MgO(MgFeO) on the magnetic properties of CoFeB/MgFeO multilayers. X-rayphotoelectron spectroscopy (XPS) as well as magnetic measurements revealed thatthe segregated Fe was reduced to metal and exhibited ferromagnetism at theCoFeB/MgFeO interface. The CoFeB/MgFeO multilayer showed more than 2-foldenhancement in perpendicular magnetic anisotropy (PMA) energy density comparedwith a standard CoFeB/MgO multilayer. The PMA energy density was furtherenhanced by inserting an ultrathin MgO layer in between CoFeB and MgFeO layers.Ferromagnetic resonance measurement also revealed a remarkable reduction ofmagnetic damping in the CoFeB/MgFeO multilayers.

Interfacial Fe segregation and its influence on magnetic properties of CoFeB/MgFeO multilayers