Preparation And Properties Of New Type Rare-earth Iron Garnet Combined Films

The thesis analysed and discussed the preparation for a seris of thin films YBilG, YblG. Faraday rotation spectra was measured on samples with model CGX-1 FR test apparatus by ourselves using the magneto-optical modulated double-frequency method.The development on magneto-optical material and devices, especially on rare-earth ion garnet, were reviewed. As a solution to the problem for temperature stabilized and wideband magneto-optical materials which could satisfy the development of magneto-optical devices for integration and miniaturization, a modified liquid phase epitaxy (LPE) technique was brought forward to grow thin film Yb3Fe5O12 onto substrate YBilG or thin film YBilG onto sustrate YbIG.The skeleton design of the growth of thin films YBilG and YbIG, the analysis of the phase graph, the establishment of the formula and the establishment of equipment for LPE were accomplished. After growing a seris of thin films YBiIG and YbIG onto substrate Gd3Ga5O12(GGG) successfully by LPE, thin film YBiIG was grown onto YbIG which grown onto substrate GGG. In the end thin film YbIG was grown onto substrate YBilG. Then the structure and component of these films were measured and anaslysed by the measurements such as XRD,SEM,EPMA,etc. The absorption coefficients from visible light to near infrared were measured with the apparatus of Perkin Elmer Lambda 20. The magneto-optical properties of thin films were measured with model CGX-1 FR test apparatus by ourselves using the magneto-optical modulated double-frequency method.It was found that the mismatch of crystal lattice played an important role in the process of LPE. For solution with certain compositons, it behaved as the growing temperature Tg. When Tg. is too high, the film was hard to grown or didn't grow well. When Tg. is too low, the film would grown too fast to well-proportioned or take in ion Pb which could increase the absorption coefficient.It was found that Tg of film YBilG was 10℃ lower than Tg of film YbIG. So that film YbIG/GGG was grown in proper temperature, then film YBilG was grown onto YbIG/GGG. To improve the magneto-optical properties of films, film YbIG was grown onto substrate YBilG which was sliced from garnet YBilG and polished.The tests of magneto-optical properties of the grown thin films showed thatthrough combining two types of rare-earth ion garnet films with opposite signs ofFarady rotation temperature coefficients, high Faraday temperature stability wasreached due to temperature compensation effect, which indicated of great potential forapplication.