Extraction of Phase Information Approximating the Demagnetization Field within a Thin-foiled Magnet Using Electron Holography Observation
Extraction of Phase Information Approximating the Demagnetization Field within a Thin-foiled Magnet Using Electron Holography Observation
复制标题
使用电子全息观测提取近似薄箔磁体内退磁场的相位信息
DOI：
10.1093/jmicro/dfac066
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发表时间：
2023
期刊：
影响因子：
1.8
通讯作者：
Y. Murakami
中科院分区：
文献类型：
--
作者：
S. Lee;A. Sato;T. Tamaoka;K. Yubuta;M. Auchi;T. Sasaki;T. Ohkubo;K. Hono;Y. Murakami
本文提出了一种方法，提供了一个相位图像的退磁场（Hd）内的薄箔永磁体使用电子全息。H的观测仍然是一个重大的挑战，因为电子全息术原则上只允许成像的磁通量密度（B），这是一个混合的贡献，从磁化（M），杂散磁场（Hs）外的标本和H内侧的标本。通过对Nd_2Fe_（14）B单晶样品的电子全息观察，得到了近似于Hd的相图，与微磁理论的预测结果吻合较好。对于永磁体，该方法可应用于对退磁场敏感的磁化机制的检查。图形摘要
This paper proposes a method that provides a phase image related to the demagnetization field (Hd) within a thin-foil permanent magnet using electron holography. The observation ofHdremains a significant challenge because electron holography in principle allows only imaging of the magnetic flux density (B), which is a mixture of the contributions from magnetization (M), stray magnetic field (Hs) outside of the specimen andHdinside of the specimen. The phase map approximatingHd, which was determined by processing of the electron holography observation from a Nd2Fe14B single-crystalline specimen, showed a good agreement with the prediction by micromagnetic theory. With respect to permanent magnets, this method can be applied to examinations about the coercivity mechanism, which is sensitive to the demagnetization field.Graphical Abstract