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This study demonstrates the accumulation of electron-induced secondary electrons by utilizing a simple geometrical configuration of two branches of a charged insulating biomaterial. The collective motion of these secondary electrons between the branches has been visualized by analyzing the reconstructed amplitude images obtained using in situ electron holography. In order to understand the collective motion of secondary electrons, the trajectories of these electrons around the branches have also been simulated by taking into account the electric field around the charged branches on the basis of Maxwell’s equations.
The microstructure and magnetic domain structure of a Co-CoO
obliquely evaporated tape for magnetic recording are studied by
analytical electron microscopy and electron holography, respectively.
While the existence of Co and CoO crystallites is confirmed by
energy-filtered electron diffraction, columnar structure of the Co
crystallites surrounded by the densely packed CoO crystallites is
visualized by an elemental mapping method with electron energy loss
spectroscopy, and the crystal orientation relation among the Co
crystallites is clarified by high-resolution electron microscopy. It is
found that the neighboring Co crystallites have close crystal
orientations. On the other hand, electron holography reveals the
magnetic flux distribution in a thin section of the tape. Although
there exists the background resulting from the effect of inner
potential with thickness variation, the distribution of lines of
magnetic flux is found to correspond well to the recorded pattern.
Precursor phenomena are critical issues for martensitic transformations. In this article, we show recent progress in understanding precursor phenomena to the R-phase transformation, which is important for both fundamentals and applications. Structural modulation in the parent phase was intensively studied by means of detailed analyses of the weak diffuse scattering of electrons with the aid of recently developed energy-filtered transmission electron microscopy coupled with x-ray diffraction. A peculiar domain-like structure, which originates from static transverse atomic displacements in the parent phase, was discovered by virtue of these advanced methods. The characteristics of this structure (e.g., size, shape, and temperature-dependence), as well as its role in the subsequent R-phase transformation, are discussed.
The following is a Web Extra expanding upon the article “Understanding Precursor Phenomena for the R-Phase Transformation in Ti-Ni-Based Alloys” by Daisuke Shindo, Yasukazu Murakami, and Takuya Ohba, published in MRS Bulletin27 (2002) pp. 121–127. It provides a closer examination of the domain structure evolution over a temperature range extended beyond that shown in Figure 5 in the article, along with intensity profiles of the electron diffraction.
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