Zhang Qiushu, Peng Bei, Xu Jintao, Chu Mengqi
School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
Polymers (Basel). 2020 Oct 29;12(11):2533. doi: 10.3390/polym12112533.
Herein, we present an investigation on the origin of the magnetically induced optical transmission of composite films comprised of polydimethylsiloxane and magnetic nanofillers via experiment and simulation. Structured and unstructured films were used in the study, which were fabricated with and without magnetic fields, respectively. Altered optical transmittance was observed from both types of films when they were subjected to an external magnetic field. Numerical analyses were performed to investigate the effect of the particle movement under magnetic field and the film magnetostriction on the film optical transmittance. The simulation results show that the changed light transmission under magnetic field is mainly due to a variation in the film thickness resulting from the film magnetostriction. The ellipsometric analysis results confirm the altered film thickness in response to the external magnetic field, and the measurements of the film magnetostrictive stresses validate that there is magnetostriction in the magnetic composite films. Additionally, it is indicated that there might be some relationship between the magnetically induced optical transmission and the film magnetostrictive stress under certain conditions.
在此，我们通过实验和模拟对由聚二甲基硅氧烷和磁性纳米填料组成的复合薄膜的磁致光传输起源进行了研究。本研究使用了结构化和非结构化薄膜，分别在有磁场和无磁场的情况下制备。当这两种类型的薄膜受到外部磁场作用时，均观察到了光透射率的改变。进行了数值分析，以研究磁场作用下粒子运动和薄膜磁致伸缩对薄膜光透射率的影响。模拟结果表明，磁场作用下光传输的变化主要是由于薄膜磁致伸缩导致的薄膜厚度变化。椭偏分析结果证实了薄膜厚度随外部磁场而改变，薄膜磁致伸缩应力的测量结果验证了磁性复合薄膜中存在磁致伸缩现象。此外，研究表明在某些条件下，磁致光传输与薄膜磁致伸缩应力之间可能存在某种关系。
