Ultramicroscopy. 2025 Mar 15:272:114132. doi: 10.1016/j.ultramic.2025.114132 Q32.12024

Quantitative evaluation of local magnetic property using magnetic domain wall width measurement with tilt-scan averaged DPC STEM

利用倾斜扫描平均DPC STEM测量磁畴壁宽度对局部磁性能进行定量评估翻译改进

Yoshiki O Murakami¹, Takehito Seki², Koudai Tabata¹, Yuichi Ikuhara³, Naoya Shibata⁴

作者单位 +展开

作者单位

¹ Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Tokyo, 113-8656, Japan.

² Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Tokyo, 113-8656, Japan; PRESTO, Japan Science and Technology Agency, Kawaguchi, 332-0012, Japan. Electronic address: seki@sigma.t.u-tokyo.ac.jp.

³ Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Tokyo, 113-8656, Japan; Nanostructures Research Laboratory, Japan Fine Ceramics Center, Atsuta-ku, Nagoya, 456-8587, Japan.

⁴ Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Tokyo, 113-8656, Japan; Nanostructures Research Laboratory, Japan Fine Ceramics Center, Atsuta-ku, Nagoya, 456-8587, Japan. Electronic address: shibata@sigma.t.u-tokyo.ac.jp.

DOI: 10.1016/j.ultramic.2025.114132 PMID: 40138875

摘要 Ai翻译

Identifying the one-to-one relationship between microstructures and magnetic properties is crucial for improving the coercivity of permanent magnets. Magnetic domain wall (DW) is an important local magnetic structure, whose width is closely related to the local magnetic properties of the magnets. Unfortunately, due to the limitations of conventional experimental methods, direct and precise measurements of nanoscale DW widths have been challenging. However, recent advancements in differential phase contrast scanning transmission electron microscopy (DPC STEM) have enabled direct imaging of magnetic field distribution down to atomic dimensions. In this study, the precise measurement of the DW width in Nd-Fe-B type magnets using high-resolution DPC images in a magnetic field-free environment was demonstrated. The change in DW width with respect to the change in the magnet's local composition was measured. Moreover, we can estimate local magnetic properties such as exchange stiffness and magnetocrystalline anisotropy from the DW width. Therefore, DPC STEM can be used to evaluate the local magnetic properties of magnets with complex microstructures.

Keywords: DPC STEM; Exchange stiffness; Magnetic domain wall; Magnetocrystalline anisotropy; Nd-Fe-B magnets.

Keywords：tilt-scan averaged DPC STEM; local magnetic property

关键词：磁畴壁宽度测量; 倾斜扫描平均DPC STEM; 局部磁性特性