Emergent Phenomena Observation Technology Research Team

Principal Investigator

PI Name Daisuke Shindo
Degree D.Eng.
Title Team Leader
Brief Resume
1982D. Eng., Tohoku University
1982Research Associate, Institute for Materials Research at Tohoku University
1992Associate Professor, Institute for Advanced Materials Processing at Tohoku University
1994Professor, Institute of Multidisciplinary Research for Advanced Materials at Tohoku University (-present)
2010Visiting Scientist, Quantum Phenomena Observation Technology Team, RIKEN
2012Quantum Phenomena Observation Technology Team, RIKEN
2012Team Leader, Emergent Phenomena Observation Technology Research Team, RIKEN
2013Team Leader, Emergent Phenomena Observation Technology Research Team, Quantum Information Electronics Division, RIKEN Center for Emergent Matter Science (-present)

Outline

For the purpose of observation and analysis of emergent phenomena, our team carries out advanced electron microscopy, especially electron holography. Electron holography is a leading-edge observation technology which utilizes the interference effect of the electron wave and can visualize electromagnetic fields on the nanometer scale. By developing multifunctional TEM-specimen holders equipped with plural probes, changes of the electromagnetic fields of a specimen under the voltage and applied magnetic field are quantitatively investigated. By improving the resolution and precision of these observation technologies, we can extensively study the mechanism of emergent phenomena in newly designed specimens of many-body systems with multiple degrees of freedom.

Research Fields

Materials Sciences, Physics, Engineering

Keywords

Imaging
Electron microscopy
Flux quantum
Electron holography
Nanomagnetism

Results

Collective motion of electrons visualized by electron holography

Comprehensive understanding of electromagnetic fields requires their visualization both inside and outside materials. Since electromagnetic fields originate from various motions of electrons, comprehensive study of motions of electrons is of vital importance as well as of significant interest for understanding various emergent phenomena. The purpose of this study is to extend electron holography technology to visualize motions of electrons. By detecting electric field variations through amplitude reconstruction processes for holograms, we have succeeded in visualizing collective motions of electrons. Figure 1 shows one of our experimental results of visualization of the collective motions of electrons by electron holography using an insulating biomaterial (microfibrils of sciatic nerve tissue) specimen with two branches. In the reconstructed amplitude images, the red regions indicate the area where electric field fluctuates due to the motions of electrons. At the initial state (Fig. 1(a)), the electric field variations indicated by red are not prominent. When the amount of electron irradiation is increased, however, red regions are localized and the position of the region changes gradually between the two branches as indicated by arrows in Fig. 1(b) and (c). These results indicate that the collective motions of electrons can be detected through electric field variation and can be visualized through amplitude reconstruction process for holograms.

Binarized reconstructed-amplitude images (red and white) around microfibrils of sciatic nerve tissue (blue). The red regions indicate the area where electric field fluctuates due to motions of electrons.

Members

Daisuke Shindo

Team Leader daisuke.shindo[at]riken.jp R

Ken Harada

Senior Research Scientist

Koudai Niitsu

Postdoctoral Researcher

Yoshimasa Ono

Part-time Worker

Yasukazu Murakami

Visiting Scientist

Zentaro Akase

Visiting Scientist

Keiko Shimada

Technical Staff II

Articles

  • Sep 16, 2014 RIKEN RESEARCH Magnetism intensified by defects
    Electron microscopy reveals how certain nanoscale crystal defects can dramatically intensify ferromagnetism in metal alloys
  • May 30, 2014 RIKEN RESEARCH The shape of spins to come
    Electron holography reveals the startling beauty of nanoscale magnetic vortices targeted for future spintronic data storage systems
  • May 23, 2014 RIKEN RESEARCH Split beams reveal the fine print
    A holographic technique for imaging electric fields in the vicinity of toner microparticles could lead to higher-quality printing

お問い合わせ

2520 Akanuma, Hikigun Hatoyamamachi, Saitama 350-0321 Japan

E-mail:
daisuke.shindo[at]riken.jp

Links