高温/磁场原位透射电镜样品台的研发及其应用
覃家转，孙鑫，白天,戴戈，赵之赫，夏卫星*,陈仁杰，闫阿儒
(1.宁波大学材料科学与化学工程学院，浙江 宁波 315211；2.稀土永磁材料联合创新中心，中国科学院宁波材料技术与工程研究所，浙江 宁波 315201）
摘 要 通过MEMS（微机电系统）技术自主开发的加热芯片结合微型强磁场发生装置，自主研发可加热加磁的透射电镜原位样品台，实现宽温度区间（室温到500 ℃）和宽磁场范围（0~0.75 T）的精准控制和连续可调。借助洛伦兹透射电子显微镜，通过对热压钕铁硼材料（居里点为320℃）磁畴结构的原位观察，验证了加热和加磁两种功能的同时实现。
关键词 洛伦兹透射电镜；原位高温加磁；磁畴；钕铁硼
中图分类号：TG14；TN16；O46；TG115.21+5.3 文献标识码：A doi：10.3969/j.issn.1000-6281.2024.03.011
Development and application of in-situ heating TEM holder with magnetic field
QIN Jiazhuan1，2, SUN Xin1，2, BAITian1，2, DAI Ge1，2, ZHAO Zhihe2, XIA Weixing2*，CHEN Renjie2, YAN Aru2
(1.School of Materials Science and Chemical Engineering, Ningbo university，Ningbo Zhejiang 315211;
2.CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Matenials Technology & Engineering, Chinese Academy of Science，NingboZhejiang 315201，China)
Abstract A heating-chip based on micro-electro-mechanical system (MEMS) technology was designed and developed. Combining with the self-developed mini-magnetic-field-generator, anin-situ heating/magnetizing sample holder of transmission electron microscope was successfully developed. The temperature from room temperature to 500 ℃ and the magnetic field from 0 to 0.75 T with high precise adjustability were realized. Based on Lorentz transmission electron microscope, the demagnetization processes of a hot-pressed NdFeB material (Curie point of 320 ℃) were observed at both room temperature and 80 ℃. The simultaneous heating and magnetizing functions were verified. The dynamic domain structure is helpful for understanding the magnetic properties of the material. The holder can be applied in many other kinds of magnetic materials.
Keywords Lorentz transmission electron microscopy; in-situheating/magnetizing; magnetic domain; Nd2Fe14B
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