Abstract
The Ru doping effect on the bilayered manganese oxide La1.2Sr1.8(Mn1−yRuy)2O7 has been investigated in the range of 0⩽y⩽0.2. The ferromagnetic transition temperature (TC) increases, while the saturated magnetization decreases, with Ru doping. These indicate that in addition to the doping-induced suppression of charge-orbital correlation, the antiferromagnetic coupling between the Ru and the Mn moments is relevant to the enhancement of TC. The axis of easy magnetization changes from within the in plane to along the c axis with Ru doping, owing to the strong magnetic anisotropy of Ru spins.
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