透過電子顕微鏡と微小プローブによる高密度圧粉磁心 (HDMC) の微細構造評価

概要

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Microstructure, magnetic domains and electric resistivity of a high density magnetic composite (HDMC), which is a type of powder magnetic cores, were studied by transmission electron microscopy. Films with homogeneous thickness, which contain insulator boundaries between Fe grains, were prepared by using a focused ion beam (FIB). Using these thin films, distribution of the lines of magnetic flux was visualized by electron holography, and the magnetic flux density was estimated to be approximately 1.7T being consistent with that of a bulk HDMC (1.70T). Additionally, from in situ Lorentz microscopy observations, the magnetization process of HDMC was observed. The insulator boundary was found to be a pinning site of the magnetic domain wall. Moreover, the resistance measurement was carried out within a transmission electron microscope (TEM) using a tungsten micro-probe. The resistance of the Fe grain was less than 2×10^<-1>Ω, while that of the insulator boundary was approximately 3×10^7Ω.magnetic corefocused ion beam methodelectron holographyfield emission gunlines of magnetic fluxmagnetization distribution
東北大学の論文
2005-03-01