Emergent Phenomena Observation Technology Research Team

In addition to microstructure analysis and composition/state analysis by high-resolution electron microscopy and analytical electron microscopy, electromagnetic field analysis both inside and outside specimens is carried out by electron holography. Electron holography is a leading-edge technology which utilizes the interference effect of the electron wave and can observe the electromagnetic field on the nanometer scale. In the analysis of electromagnetic field, a special specimen holder attached with plural probes is utilized and the change of the electromagnetic field of the specimen under the voltage and magnetic field applied is investigated, and eventually its correspondence to the electric and magnetic properties of the specimen is clarified. By improving the resolution and precision of these observation technologies, clarification of the mechanism of emergent phenomena in newly designed specimens of many-body systems with multiple degrees of freedom is extensively carried out.

Research Fields

Physics / Engineering / Materials Sciences

Research Subjects

• Analysis of microstructure and electromagnetic field by high-resolution/analytical electron microscopy and electron holography
• Dynamic observation of electromagnetic field under the voltage and magnetic field applied by a special specimen holder attached with plural probes
• Improvement of resolution and precision of the above observation technologies and clarification of mechanism of emergent phenomena in many-body systems with multiple degrees of freedom

Publications

1. H. S. Park, et al. Electron Holography Studies on Narrow Magnetic Domain Walls Observed in a Heusler Alloy Ni50Mn25Al12.5Ga12.5, Adv. Funct. Mater. 2012, 22, 3434.
2. Z. Akase, et al. Imaging of magnetic flux distribution in vicinity of insulating particles in high-Tc superconductor by electron holography, J. Appl. Phys. 2012, 111, 033912.
3. T. Tanigaki, et al. Split-illumination electron holography, Appl. Phys. Lett. 2012, 101, 043101.
4. W.X. Xia, et al. Magnetization distribution of magnetic vortex of amorphous FeSiB investigated by electron holography and computer simulation, J. Electron Microsc. 2012, 61, 71.
5. Y. Murakami, et al. Magnetic domain structure in the orbital-spin-coupled system MnV2O4, Phys. Rev. B 2011, 84, 054421.
6. Y. Murakami, et al. Ferromagnetic domain nucleation and growth in colossal magnetoresistive manganite, Nat. Nanotecknol. 2010, 5, 37.
7. W. X. Xia, et al. Investigation of magnetic structure and magnetization process of yttrium iron garnet film by Lorentz microscopy and electron holography, J. Appl. Phys. 2010, 108, 123919.
8. W. X. Xia, et al. Quantitative evaluation of magnetic flux density in a magnetic recording head and pseudo soft underlayer by electron holography, J. Electron Microsc. 2010, 59, 331.
9. D. Shindo, Y. Murakami, Electron holography study of electric field variations, J. Electron Microsc. 2011, 60, S225.
10. D. Shindo, Y. Murakami, Electron holography of magnetic materials, J. Phys. D Appl. Phys. 2008, 41, 183002.