Riesgo Graciela, Elbaile Laura, Carrizo Javier, Crespo Rosario Díaz, García María Ángeles, Torres Yadir, García José Ángel
Centro de Seguridad Marítima Integral Jovellanos, Camín del Centro de Salvamento n 279, 33393 Gijón, Spain.
Departamento de Física, Universidad de Oviedo, c/Calvo Sotelo s/n, 33007 Oviedo, Spain.
Materials (Basel). 2020 May 29;13(11):2472. doi: 10.3390/ma13112472.
Magnetic composites of soft magnetic FeGa particles embedded in a silicone matrix have been synthesized. The Villari effect has been studied depending on the size and concentration of the particles and on the magnetic state of the composite. The results indicate a decrease in the Villari effect when the concentration of the magnetic particles increases. These results suggest a relationship between the Villari effect and the mechanical properties of the composites. The Young's modulus of the composites has been obtained by microindentation and their values related to the intensity and slope of the Villari signals. The results are explained on the basis that the reduction in the cross section of the composite when submitted to stress is the main origin of the variation of the magnetic flux in the Villari effect in this kind of composite. It has also been obtained that the magnetic state of the composite plays an important role in the Villari signal. When the magnetization of the composite is greater, the magnetic flux across the composite is greater too and, so, the same reduction in the cross section originates a greater Villari signal.
已合成了嵌入硅树脂基体中的软磁FeGa颗粒的磁性复合材料。研究了维拉里效应与颗粒尺寸、浓度以及复合材料磁状态之间的关系。结果表明，当磁性颗粒浓度增加时，维拉里效应会减弱。这些结果表明了维拉里效应与复合材料力学性能之间的关系。通过微压痕法获得了复合材料的杨氏模量，其值与维拉里信号的强度和斜率相关。基于以下原因对结果进行了解释：在这种复合材料中，当受到应力时复合材料横截面的减小是维拉里效应中磁通量变化的主要来源。还发现复合材料的磁状态在维拉里信号中起着重要作用。当复合材料的磁化强度越大时，穿过复合材料的磁通量也越大，因此，相同的横截面减小会产生更大的维拉里信号。
