摘要
The magnetic and dielectric properties of polycrystalline Cdl-~FexCr2S4 （0 〈 x ~ 0.9） are investigated. Upon substitution of Cd by Fe, the Curie temperature （Tc） is increased while the saturation magnetization is decreased. A low doping level of Fe increases the permittivity, while a high doping level decreases the permittivity, which is explained by the internal barrier layer capacitor model. Kinks are observed in the temperature-dependent permittivity and loss tangent near TC for the samples with x = 0.5, 0.7, 0.9, implying the existence of the magnetodielectric effect. Furthermore, with the increase of Fe content, a decrease of anomaly deviation rate induced by internal molecular field is revealed in the permittivity, while an increase is observed for the loss tangent.
The magnetic and dielectric properties of polycrystalline Cdl-~FexCr2S4 （0 〈 x ~ 0.9） are investigated. Upon substitution of Cd by Fe, the Curie temperature （Tc） is increased while the saturation magnetization is decreased. A low doping level of Fe increases the permittivity, while a high doping level decreases the permittivity, which is explained by the internal barrier layer capacitor model. Kinks are observed in the temperature-dependent permittivity and loss tangent near TC for the samples with x = 0.5, 0.7, 0.9, implying the existence of the magnetodielectric effect. Furthermore, with the increase of Fe content, a decrease of anomaly deviation rate induced by internal molecular field is revealed in the permittivity, while an increase is observed for the loss tangent.
基金
Project supported by the National Natural Science Foundation of China (Grant No.10874228)
the National Basic Research Program of China (Grant No.2010CB833102)
