含镓石榴石系列大晶格常数磁光衬底单晶研究进展

Research Progress on Gallium Garnet Series Single Crystal with Large Lattice Constant for Magneto-Optical Substrates

近年来,光通信技术与集成电子器件飞速发展,以稀土铁石榴石(RIG)为代表的磁光薄膜被视为应用于近红外通信窗口最具潜力的磁光材料。为了尽量减小磁光薄膜在制备过程中相关性能受到的影响,衬底材料的选择成为关键。制备RIG磁光薄膜通常采用Si类及石榴石氧化物类作为衬底材料。RIG磁光薄膜的晶格常数一般在12.4左右,含镓类石榴石氧化物单晶衬底基片与其晶格常数相近,具有大晶格常数特性,是其合适的衬底材料之一。但是,由于原料氧化镓高温易挥发,使含镓类石榴石单晶制备成为一直以来关注和讨论的热点。深入研究含镓类石榴石衬底单晶有望促进新一代磁光器件的发展。本文综述了在含镓类石榴石系列单晶中,氧化物磁光衬底单晶的研究进展,总结了本团队在该类晶体生长、晶体结构、关键参数等方面的研究工作,展望了该类晶体的研究发展趋势。

With the rapid advancement of optical communication technology and integrated electronic devices,magneto-optical thin films,particularly rare earth iron garnet(RIG),have emerged as the most promising materials for near-infrared communication windows in recent years.In order to minimize the impact on the related properties of magneto-optical thin films during the preparation process,it’s important to select the substrate materials.Silicon and garnet oxides are commonly used as substrates for the preparation of RIG magneto-optical thin films.The lattice constant of RIG magneto-optical thin films is generally around 12.4,and gallium-containing garnet oxide single crystal substrates have a similar lattice constant,which shows large lattice constant characteristics,making them one of the suitable substrate materials.However,the raw material gallium oxide is volatile at high temperature,the preparation of gallium-containing garnet single crystal has been a hot topic.The further study of gallium garnet series substrate single crystals is expected to promote the development of a new magneto-optical devices.In this paper,we reviewed the research of gallium garnet series single crystal,summarized the work of our team in the growth,structure and key parameters of these crystals,and outlooked the trend of research and development.