Optimizing the quality of epitaxial Y3Fe5O12 thin films via a two-step post-annealing process

Cobot Pub Date : 2022-09-28 DOI:10.12688/cobot.17583.1

Yunfei Xie, Yucong Yang, Donghua Liu, Shuyao Chen, D. Gao, Bihui Tan, Tao Gong, Qiuling Chen, Lei Bi, Tao Liu, Longjiang Deng

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引用次数: 1

Abstract

Background: Yttrium iron garnet (Y3Fe5O12, YIG) is a prototype magnetic garnet, which possesses the lowest magnetic damping (α) value so far on the earth among all discovered or synthesized materials. This makes it the best candidate for categories of next generation spintronic devices, possessing great application potentials. Methods: A two-step annealing method, with first annealing carried out at a relative low temperature and second annealing at a relatively higher temperature, had been used for the first time to crystallize room temperature sputtered amorphous Y3Fe5O12 (YIG) films on Gd3Ga5O12 (GGG) substrates. The crystalline structure, surface morphology, static and dynamic magnetic properties of the obtained YIG films were characterized through X-ray diffraction (XRD), atomic force microscopy (AFM), vibrating sample magnetometer (VSM) and ferromagnetic resonance (FMR) systems, respectively. Results: It was found that the YIG films obtained via this elaborate annealing method, have a much smoother surface, lower coercivity field, and better dynamic magnetic properties, than that of the YIG films annealed by ordinary one-step approach. Particularly, the ferromagnetic resonance (FMR) linewidth of the best two-step annealed 25 nm YIG film is lower than ~7 Oe at frequency of 10 GHz. Conclusions: Our work clarifies that this two-step annealing approach can effectively improve the quality of the obtained epitaxial YIG films on GGG substrates.

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通过两步后退火工艺优化Y3Fe5O12外延薄膜的质量

背景：钇铁石榴石（Y3Fe5O12，YIG）是一种原型磁性石榴石，在所有已发现或合成的材料中具有迄今为止地球上最低的磁阻尼（α）值。这使其成为下一代自旋电子器件类别的最佳候选者，具有巨大的应用潜力。方法：首次采用两步退火法在Gd3Ga5O12（GGG）衬底上室温溅射非晶Y3Fe5O12薄膜，第一步退火温度相对较低，第二步退火温度较高。分别通过X射线衍射（XRD）、原子力显微镜（AFM）、振动样品磁强计（VSM）和铁磁共振（FMR）系统对所得YIG薄膜的晶体结构、表面形貌、静态和动态磁性进行了表征。结果：采用这种精细的退火方法制备的YIG薄膜，与采用普通一步退火方法制得的YIG膜相比，具有更光滑的表面、更低的矫顽力场和更好的动态磁性能。特别地，在10GHz的频率下，最佳的两步退火25nm YIG膜的铁磁共振（FMR）线宽低于~7Oe。结论：我们的工作阐明了这种两步退火方法可以有效地提高在GGG衬底上获得的外延YIG膜的质量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Cobot collaborative robots-

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期刊介绍： Cobot is a rapid multidisciplinary open access publishing platform for research focused on the interdisciplinary field of collaborative robots. The aim of Cobot is to enhance knowledge and share the results of the latest innovative technologies for the technicians, researchers and experts engaged in collaborative robot research. The platform will welcome submissions in all areas of scientific and technical research related to collaborative robots, and all articles will benefit from open peer review. The scope of Cobot includes, but is not limited to: ● Intelligent robots ● Artificial intelligence ● Human-machine collaboration and integration ● Machine vision ● Intelligent sensing ● Smart materials ● Design, development and testing of collaborative robots ● Software for cobots ● Industrial applications of cobots ● Service applications of cobots ● Medical and health applications of cobots ● Educational applications of cobots As well as research articles and case studies, Cobot accepts a variety of article types including method articles, study protocols, software tools, systematic reviews, data notes, brief reports, and opinion articles.