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用于永磁体高级表征的电子全息术：退磁场映射与相位分析中精度的提高

Electron Holography for Advanced Characterization of Permanent Magnets: Demagnetization Field Mapping and Enhanced Precision in Phase Analysis.

作者信息

Lee Sujin

机构信息

Nano Materials Research Division, Korea Institute of Materials Science, Changwon 51508, Republic of Korea.

出版信息

Nanomaterials (Basel). 2024 Dec 20;14(24):2046. doi: 10.3390/nano14242046.

DOI:10.3390/nano14242046
PMID:39728582
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11676280/
Abstract

This review explores a method of visualizing a demagnetization field () within a thin-foiled NdFeB specimen using electron holography observation. Mapping the is critical in electron holography as it provides the only information on magnetic flux density. The map within a NdFeB thin foil, derived from this method, showed good agreement with the micromagnetic simulation result, providing valuable insights related to coercivity. Furthermore, this review examines the application of the wavelet hidden Markov model (WHMM) for noise suppression in thin-foiled NdFeB crystals. The results show significant suppression of artificial phase jumps in the reconstructed phase images due to the poor visibility of electron holograms under the narrowest fringe spacing required for spatial resolution in electron holography. These techniques substantially enhance the precision of phase analysis and are applicable to a wide range of magnetic materials, enabling more accurate magnetic characterization.

摘要

本综述探讨了一种利用电子全息观察来可视化薄箔钕铁硼试样内退磁场（）的方法。在电子全息术中绘制退磁场至关重要，因为它提供了关于磁通密度的唯一信息。通过该方法得到的钕铁硼薄箔内的退磁场图与微磁模拟结果显示出良好的一致性，为矫顽力相关问题提供了有价值的见解。此外，本综述研究了小波隐马尔可夫模型（WHMM）在薄箔钕铁硼晶体噪声抑制中的应用。结果表明，由于在电子全息术空间分辨率所需的最窄条纹间距下电子全息图的可见性较差，重建相位图像中的人工相位跳变得到了显著抑制。这些技术大大提高了相位分析的精度，适用于广泛的磁性材料，能够实现更精确的磁性表征。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/5c498982ac6f/nanomaterials-14-02046-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/8e479b93b07e/nanomaterials-14-02046-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/9900636b8fb6/nanomaterials-14-02046-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/5d0a6f04c317/nanomaterials-14-02046-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/80c9221c5b43/nanomaterials-14-02046-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/c13a2bc829e3/nanomaterials-14-02046-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/f1366951e6d1/nanomaterials-14-02046-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/1faf15c1d4cc/nanomaterials-14-02046-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/5c498982ac6f/nanomaterials-14-02046-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/8e479b93b07e/nanomaterials-14-02046-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/9900636b8fb6/nanomaterials-14-02046-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/5d0a6f04c317/nanomaterials-14-02046-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/80c9221c5b43/nanomaterials-14-02046-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/c13a2bc829e3/nanomaterials-14-02046-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/f1366951e6d1/nanomaterials-14-02046-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/1faf15c1d4cc/nanomaterials-14-02046-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/70b1/11676280/5c498982ac6f/nanomaterials-14-02046-g008.jpg

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本文引用的文献

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Noise reduction of electron holography observations for a thin-foiled Nd-Fe-B specimen using the wavelet hidden Markov model.使用小波隐马尔可夫模型对薄箔钕铁硼样品的电子全息观测进行降噪处理。
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2
Removal of phase residues in electron holography.电子全息术中相残留的去除。
Microscopy (Oxf). 2024 Jul 30;73(4):376-380. doi: 10.1093/jmicro/dfad062.
3
Extraction of phase information approximating the demagnetization field within a thin-foiled magnet using electron holography observation.
利用电子全息观测提取薄箔磁体内部近似退磁场的相位信息。
Microscopy (Oxf). 2023 Aug 4;72(4):343-352. doi: 10.1093/jmicro/dfac066.
4
Off-axis electron holography of Néel-type skyrmions in multilayers of heavy metals and ferromagnets.重金属与铁磁体多层结构中尼尔型斯格明子的离轴电子全息术
Ultramicroscopy. 2021 Jan;220:113155. doi: 10.1016/j.ultramic.2020.113155. Epub 2020 Oct 24.
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Denoising of series electron holograms using tensor decomposition.使用张量分解对系列电子全息图进行去噪
Microscopy (Oxf). 2021 Jun 6;70(3):255-264. doi: 10.1093/jmicro/dfaa057.
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Simulation-Trained Sparse Coding for High-Precision Phase Imaging in Low-Dose Electron Holography.模拟训练的稀疏编码在低剂量电子全息术中的高精度相位成像。
Microsc Microanal. 2020 Jun;26(3):429-438. doi: 10.1017/S1431927620001452.
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