YIG磁光晶体的光学浮区法生长

doi:10.16553/j.cnki.issn1000-985x.2026.0051

摘要/Abstract

摘要： 钇铁石榴石（Y₃Fe₅O₁₂， YIG）晶体因优异的磁光性能，在光学通信与光子集成领域具有重要的应用价值。本文采用光学浮区法生长了YIG单晶，系统研究了生长气氛对YIG单晶光学质量的影响。结果表明，在空气和不同氧分压气氛下均可获得纯相石榴石结构，在纯O₂气氛下所生长晶体在红外波段表现出更优的透过性能，透过率接近理论值（~75%）。这主要归因于生长过程中较高的氧分压有效抑制了Fe³⁺的变价现象。Fe 2p X射线光电子能谱分析进一步表明，空气气氛下生长的晶体中Fe²⁺相对含量高达62%（摩尔分数），而纯O₂气氛下生长的晶体中Fe²⁺相对含量降至9%（摩尔分数），从化学态层面直接证实了氧分压对Fe³⁺变价的有效抑制，从而有利于高质量磁光晶体的制备。1 386 nm的磁光性能测试进一步证实，所制备YIG晶体具有良好的磁光调制性能，其法拉第旋转角可达225 （°）/cm。本研究为高质量铁基石榴石晶体的制备提供了一种可行路径，对推动相应磁光晶体功能器件的发展具有重要意义。

关键词: YIG; 磁光晶体; 晶体生长; 光学浮区法; 生长气氛

Abstract: Yttrium iron garnet （Y₃Fe₅O₁₂， YIG） crystals possess exceptional magneto-optical properties， rendering pivotal for optical communication and photonic integration. Herein， YIG single crystals were grown via the optical floating zone method， and the influence of growth atmosphere on optical quality of YIG single crystal was systematically investigated. The results show that phase-pure garnet structures are successfully obtained under both air and different oxygen partial pressure atmospheres. Crucially， crystals grown under pure O₂ atmosphere exhibit superior transmittance performance in the infrared band， and its transmittance is close to the theoretical value （~75%）. This is primarily due to the higher oxygen partial pressure during the growth process， which effectively inhibits the valence change of Fe³⁺. Fe 2p X-ray photoelectron spectroscopy analysis further reveals that the relative content of Fe²⁺ is as high as 62% （mole fraction） in grown crystals under air atmosphere， but the relative content of Fe²⁺ is reduced to 9% （mole fraction） in grown crystals under pure O₂ atmosphere， which directly confirms the effective inhibition of oxygen partial pressure on the valence change of Fe³⁺ from the chemical state level， thus facilitating preparation of high-quality magneto-optical crystals. The magneto-optical performance test at 1 386 nm further confirms that the prepared YIG crystal has good magneto-optical modulation performance， and its Faraday rotation angle can reach 225 （°）/cm. This study provides a feasible path for the preparation of high-quality iron-based garnet crystals， which is of great significance for promoting the development of corresponding magneto-optical crystal functional devices.

Key words: YIG; magneto-optical crystal; crystal growth; optical floating zone method; growth atmosphere

中图分类号:

傅昭澍, 王树贤, 路大治, 武奎, 于浩海, 张怀金. YIG磁光晶体的光学浮区法生长[J]. 人工晶体学报, 2026, 55(9): 1371-1376.

FU Zhaoshu, WANG Shuxian, LU Dazhi, WU Kui, YU Haohai, ZHANG Huaijin. Optical Floating Zone Method Growth of YIG Magneto-Optical Crystals[J]. Journal of Synthetic Crystals, 2026, 55(9): 1371-1376.

图/表 6

图1 YIG烧结料棒的实物照片（a）和YIG烧结料棒标准配比区域的XRD图谱（b）

Fig.1 Physical photo of sintered YIG feed rod （a） and XRD pattern of standard ratio region in sintered YIG feed rod （b）

图2 纯O2气氛下生长YIG晶体过程中的熔区形貌照片（a）和不同氧分压气氛下生长的YIG晶体与加工样品的实物照片（b）

Fig.2 Photo of molten zone morphology during YIG crystal growth process in pure O2 atmosphere （a） and photographs of YIG crystals and processed samples grown under different oxygen partial pressure atmospheres （b）

图3 不同氧分压气氛下生长的YIG晶体XRD图谱

Fig.3 XRD patterns of YIG crystals grown under different oxygen partial pressure atmospheres

图4 不同氧分压气氛下生长的YIG晶体的红外透过率曲线（a）和吸收系数（b）

Fig.4 Infrared transmittance curves （a） and absorption coefficients （b） of YIG crystals grown under different oxygen partial pressure atmospheres

图5 空气气氛下生长样品的Fe 2p XPS（a），纯O2气氛下生长样品的Fe 2p XPS（b）和峰拟合得到的Fe2+与Fe3+相对含量（c）

Fig.5 Fe 2p XPS of sample grown under air atmosphere （a）， Fe 2p XPS of sample grown under pure O2 atmosphere （b） and relative content of Fe2+ and Fe3+ obtained from peak fitting analysis （c）

图6 纯O2气氛下生长的YIG晶体法拉第旋转角随磁场的变化曲线

Fig.6 Variation curve of Faraday rotation angle for YIG crystal grown under pure O2 atmosphere with magnetic field

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