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We have investigated the exchange anisotropy in L12-ordered Mn 3Ir/Co 65Fe 35 bilayers with inserting ultra-thin CoxFe100 - x(x > 65) layer at the interface between L12-Mn3 Ir and Co65 Fe35 layer. The unidirectional anisotropy constant, JK, was enhanced from 0.93 erg/cm2 to 1.2erg/cm2 at the range from 85 to 98 at.% of Co composition in CoxFe100 - x insertion layer. The crystal structure of the ultra-thin Co90 Fe10 insertion layer was transformed to bcc structure following the bcc structured Co65 Fe35 layer during thermal annealing. These results suggest that the enhancement of exchange anisotropy with ultra-thin Co xFe 100 - x(x > 80) insertion layer is attributed to the Co-rich bcc phase formation in the insertion layer.