Lorentz microscopic observations of electrical steel sheets under an alternating current magnetic field
Lorentz microscopic observations of electrical steel sheets under an alternating current magnetic field
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DOI：
10.2320/matertrans.md200714
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发表时间：
2007-10-01
影响因子：
1.2
通讯作者：
Taniyama, Akira
中科院分区：
文献类型：
--
作者：
Akase, Zentaro;Shindo, Daisuke;Taniyama, Akira
利用最近安装在我们的透射电子显微镜上的交流磁系统，在交流磁场下对电工钢板进行了原位洛伦兹显微镜观察。在低频交流磁场作用下，磁化壁能平稳移动。通过衍射对比，观察和阐明了析出物之间的相互作用和磁畴壁的运动。最终，发现磁畴壁被钉扎在沉淀物周围的应变场上。在高频交流磁场下也进行了观察。结果表明，交流磁场下的原位洛伦兹显微观察对于研究电工钢板微观组织与磁畴壁运动之间的相互作用是非常有用的。
By utilizing an alternating current (AC) magnetic system recently installed on our transmission electron microscope (TEM), in-situ Lorentz microscope observations of electrical steel sheets were carried out under an AC magnetic field. The domain walls moved smoothly under a low frequency AC magnetic field. By using diffraction contrast, interactions between precipitates and the motion of the magnetic domain walls were visualized and clarified. Eventually, the magnetic domain walls were found to be pinned at strain fields around precipitates. Observations under higher frequency AC magnetic fields were also carried out. It was demonstrated that in-situ Lorentz microscopic observations under an AC magnetic field are very useful for the investigation of interactions between the microstructure and the motion of magnetic domain walls in electrical steel sheets.