Exchange Bias in Polycrystalline BiFe1-x Mnx 3 /Ni81 Fe19 Bilayers
YUAN Xue-Yong1 , XUE Xiao-Bo2 , SI Li-Fang1 , DU Jun2 , XU Qing-Yu1,3**
1 Department of Physics, Southeast University, Nanjing 211189 2 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 3 Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096
Abstract ：Polycrystalline BiFe1-x Mnx 3 films with x up to 0.50 are prepared on LaNiO3 buffered surface oxidized Si substrates. The doped Mn is confirmed to be partially in a +4 valence state. A clear exchange bias effect is observed with a 3.6 nm Ni81 Fe19 layer deposited on the top BiFe1-x Mnx 3 layer, which decreases drastically with increasing Mn doping concentration and finally to zero when x is above 0.20. These results clearly demonstrate that the exchange bias field comes from the net spins due to the canted antiferromagnetic spin structure in polycrystalline BiFe1-x Mnx 3 films, which transforms to a collinear antiferromagnetic spin structure when the Mn doping concentration is larger than 0.20.
收稿日期: 2012-07-04
出版日期: 2012-10-01
:
77.55.Nv
(Multiferroic/magnetoelectric films)
75.30.Et
(Exchange and superexchange interactions)
75.50.Ee
(Antiferromagnetics)
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2012, Vol. 29 
