摘要
We observed an exchange bias effect in La0.5Ca0.5FeO3 perovskite compound.The exchange bias is associated with the charge disproportionation transition from Fe4+ions to Fe3+and Fe5+ions below 175 K.The competition between the ferromagnetic interaction of Fe3+and Fe5+ions and the antiferromagnetic one of Fe3+and Fe3+ions results in a unidirectional anisotropy in the cluster-glass system.An antiferromagnetically interfacial exchange coupling constant Ji1.95 meV at the cluster-glass region was yielded by fitting the cooling field-dependence of the exchange bias field.
We observed an exchange bias effect in La0.5Ca0.5FeO3 perovskite compound. The exchange bias is associated with the charge disproportionation transition from Fe4＋ions to Fe3＋and Fe5＋ions below 175 K. The competition between the ferromagnetic interaction of Fe3＋and Fe5＋ions and the antiferromagnetic one of Fe3＋and Fe3＋ions results in a unidirectional anisotropy in the cluster-glass system. An antiferromagnetically interfacial exchange coupling constant Ji 1.95 meV at the cluster-glass region was yielded by fitting the cooling field-dependence of the exchange bias field.
基金
supported by the National Basic Research Program of China
the National Natural Sciences Foundation of China(Grant No.11205015)
the Natural Sciences Foundation of Beijing(Grant No.1113017)
Beijing Area Logistics System&Technology Major Laboratory and the Logistics Management and Engineering Innovation Platform of Beijing Wuzi University
