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BiFeO3 Thickness Dependence of the Exchange Bias in Polycrystalline BiFeO3/NiFe Bilayers
Xiaobo Xue,Biao You,Wenbing Rui,Wei Zhang,Jun Du,Xueyong Yuan,Qingyu Xu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
A clear exchange bias has been observed at room temperature in a series of BiFeO3(t)/NiFe(3.6nm) bilayers, in which the BiFeO3 layers are single-phase polycrystalline with t varied from 8 nmto 240 nm. With increasing t, both the exchange bias field (HE) and the coercivity (HC) increasesharply and approach maxima when t is about 40 nm, which is close to one half the spin cycloidalmodulation period (64 nm) of the bulk BiFeO3 material. The oscillatory variations of HE and HCwith the BiFeO3 layer thickness suggest that the cycloidal spin structure may exist in polycrystallineBiFeO3 thin films. The angular dependence of the exchange bias exhibits collinear unidirectionaland uniaxial anisotropies in the present BiFeO3/NiFe bilayers.