電子線ホログラフィーによるSm-Co永久磁石の磁化分布の観察

概要

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In addition to microstructure analysis and magnetic domain observation by bright-field electron microscopy and Lorentz microscopy respectively, magnetization distribution of both as-sintered and step-aged specimens is analyzed by electron holography. Bright-field images of as-sintered and step-aged specimens do not show any significant difference in their microstructures. On the other hand, a Lorentz microscope image of the as-sintered specimen shows straight domain walls being parallel to the c-axis, while the serrated domain walls corresponding to the pinning at cell boundaries are clearly observed in the step-aged specimen. Furthermore, the detailed analysis with electron holography reveals that the direction of the lines of magnetic flux near the domain wall in the step-aged specimen changes more drastically than that in the as-sintered one. Finally, the fluctuation of the lines of magnetic flux in the step-aged magnet is considered to result from the strong domain wall pinning. (Received October 11, 2002)Sm(Co, Fe, Cu, Zr)-permanent magnetelectron holographyfield emission gunthe lines of magnetic fluxmagnetization distribution
東北大学の論文
2003-03-03