To conduct operando measurements, we previously developed a sample-heating system and, for this study, developed a magnetic-field-application system for spin-polarized scanning electron microscopy measurement. A Sm₂Co₁₇ permanent magnet placed below a sample, which works with a resistive heater, is used to apply a magnetic field of more than 20 kA/m perpendicular to a sample at up to 200 ℃. A specially designed magnetic shield is attached close to the sample to avoid decreasing the accuracy of secondary polarization detection due to the stray field from the magnet. With this system, we observed the reformation of a magnetic domain structure of Fe (001) at 200 ℃ by applying a magnetic field of 20 kA/m.

为了进行操作测量，我们之前开发了一个样品加热系统，并在本研究中开发了一个用于自旋极化扫描电子显微镜测量的磁场应用系统。放置在样品下方的Sm ₂ Co ₁₇永磁体与电阻加热器一起工作，用于在高达 200 ℃ 的温度下垂直于样品施加超过 20 kA/m 的磁场。一个专门设计的磁屏蔽靠近样品，以避免由于来自磁铁的杂散场而降低二次极化检测的准确性。使用该系统，我们通过施加 20 kA/m 的磁场在 200 ℃ 观察了 Fe (001) 的磁畴结构的重组。