Preparation Of Yttrium Iron Garnet Target And Films As Well As The Application Research

The magneto-optical devices which are based on Faraday rotation effect are widely used in many research such as the optical communication, optical sensors and magneto-optical storage. More and more attentions have been paid to the methods of fabrication of magneto-optical materials and enhancement of Faraday rotation effect.With the development of the integrated optics, the mainstream of the microwave devices is low cost and miniaturization. The film magneto-optical materials have attracted much research due to the advantages of low production cost, simple structure, light in weight and small volume.Our study revolves the preparation of Yttrium Iron Garnet(Y3Fe5O12, YIG)target and films around, and starts with the theoretical calculation of magneto-optical materials. We have performed a first principle calculation on the YFe O3 and YIG based on the density functional theory(DFT). The theoretical calculation may serve as a predicted and supplementary study of the experiment. We have calculated the optical, electronic and magnetic properties.Firstly, we prepare YIG powder by using the solid-state reaction method. We analyze the properties of the powders by using the XRD, SEM and VSM. Secondly, we Prepare of YIG films on Si/Si O2 substrate by PLD method, and study the magnetic properties through the gained the magnetic hysteresis loop. We analyze the optical rotation by measuring the magneto-optical properties of the materials. In this study, we have deposited the YIG film on the quartz substrate successfully, which is the base of the further research.Although we have successfully deposited the YIG on the quartz substrate, the thickness of the film is very small. Additionally, due to the mismatch of the YIG and Si O2/Si, the ultra thick film is seemed to be impossible to be deposited on the quartz substrate. Therefore, we have performed a theoretical stimulation of the Photonic crystal model, where garnet film is deposited on the glass substrate. Through the stimulation, we analyze the intrinsic reason of enhancement of faraday rotation effect.In this work, the results of investigation of one-dimensional magnetophotonic crystal are presented. In particular, the Faraday rotation can be significantly enhanced.Based on the fabricated films, we also study the influence of localized surface plasmons on the Faraday rotation effect. We have performed a theoretical stimulation of the Photonic crystal model, where garnet film is deposited on the glass substrate and periodic gold nanowires are sitting atop. Through the stimulation, we analyze the intrinsic reason of enhancement of faraday rotation effect.