We have investigated electron-and hole-doping effects on A-site ordered perovskite manganite NdBaMn 2 O 6 , which has the A-type (layered) antiferromagnetic (AFM) ground state. Electrons (holes) are introduced by partial substitution of Ba 2+ (Nd 3+ ) with Nd 3+ (Ba 2+ ). Electron-doping generates ferromagnetic (FM) clusters in the A-type AFM matrix. With increasing the electron-doping level, the volume fraction of the FM phase or the number of the FM clusters is abruptly increasing. In contrast, the A-type AFM phase is robust against the hole-doping, and no FM correlation is observed in the hole-doped NdBaMn 2 O 6 .

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