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RIKEN Center for Emergent Matter Science Emergent Phenomena Observation Technology Research Team

Team Leader: Seigo Tarucha (D.Eng.)

Research Summary

Seigo Tarucha

Electron holography is a leading-edge technology utilizing the interference effects of electron waves and is capable of observing electromagnetic fields on the nanometer scale. By measuring electromagnetic field changes in and around specimens under the application of electric and/or magnetic fields, correspondences to their electric and magnetic properties are studied. Furthermore, visualization of collective motions of secondary electrons due to electron movement is realized by measuring perturbed electric fields. Improvement of resolution and precision of these observation technologies will enable us to clarify mechanisms of emergent matter phenomena in many-body systems with multiple degrees of freedom.

Main Research Fields

  • Interdisciplinary Science & Engineering

Related Research Fields

  • Engineering


  • Electron Holography
  • Electromagnetic Field

Selected Publications

  • 1.D. Shindo, T. Tanigaki and H. S. Park:
    "Advanced Electron Holography Applied to Electromagnetic Field Study in Materials Science"
    Advanced Materials 29,1602216 (2017).
  • 2.M. Nakamura, F. Kagawa, T. Tanigaki, H. S. Park, T. Matsuda, D. Shindo, Y. Tokura and M. Kawasaki:
    "Spontaneous Polarization and Bulk Photovoltaic Effect Driven by Polar Discontinuity in LaFeO3/SrTiO3 Heterojunctions"
    Physical Review Letters 116, 156801 (2016).
  • 3.K. Shibata, J. Iwasaki, N. Kanazawa, S. Aizawa, T. Tanigaki, M. Shirai, T. Nakajima, M. Kubota, M. Kawasaki, H. S. Park, D. Shindo, N. Nagaosa and Y. Tokura
    "Large anisotropic deformation of skyrmions in strained crystal"
    Nature Nanotechnology 10, 589-593 (2015).
  • 4.T. Tanigaki, Y. Takahashi, T. Shimakura, T. Akashi, R. Tsuneta, A. Sugawara and D. Shindo:
    "Three-Dimensional Observation of Magnetic Vortex Cores in Stacked Ferromagnetic Discs"
    Nano Letters 15, 1309-1314 (2015).
  • 5.T. Tanigaki, K. Shibata, N. Kanazawa, X. Yu, Y. Onose, H. S. Park, D. Shindo and Y. Tokura:
    "Real-Space Observation of Short-Period Cubic Lattice of Skyrmions in MnGe"
    Nano Letters 15, 5438-5442 (2015).
  • 6.H. S. Park, Z. Yu, S. Aizawa, T. Tanigaki, T. Akashi, Y. Takahashi, T. Matsuda, N. Kanazawa, Y. Onose, D. Shindo, A. Tonomura and Y. Tokura:
    "Observation of the magnetic flux and three-dimensional structure of skyrmion lattices by electron holography"
    Nature Nanotechnology 9, 337-342 (2014)
  • 7.Y. Murakami, K. Niitsu, T. Tanigaki, R. Kainuma, H. S. Park and D. Shindo:
    "Magnetization amplified by structural disorder within nanometre-scale interface region"
    Nature Communications 5, 4133 (2014)
  • 8.D. Shindo, S. Aizawa, Z. Akase, T. Tanigaki, Y. Murakami and H. S. Park
    "Electron holographic visualization of collective motion of electrons through electric field variation"
    Microscopy and Microanalysis 20(04), 1015-1021 (2014)
  • 9.T. Tanigaki, K. Sato, Z.Akase, S. Aizawa, H. S. Park, T. Matsuda, Y. Murakami, D. Shindo and H. Kawase:
    "Split-illumination electron holography for improved evaluation of electrostatic potential associated with electrophotography"
    Applied Physics Letters 104, 131601 (2014)
  • 10.T. Tanigaki, S. Aizawa, H. S. Park, T. Matsuda, K. Harada and D. Shindo:
    "Advanced split-illumination electron holography without Fresnel fringes"
    Ultramicroscopy 137, 7-11 (2014)

Recent Research Results

Related Links

Lab Members

Principal investigator

Seigo Tarucha
Team Leader

Core members

Ken Harada
Senior Scientist
Yoh Iwasaki
Technical Scientist
Yasukazu Murakami
Visiting Scientist
Zentaro Akase
Visiting Scientist
Koudai Niitsu
Visiting Scientist
Keiko Shimada
Technical Staff I

Contact Information

Center for Exploratory Research, Hitachi, Ltd.
Akanuma 2520,
Hatoyama-machi, Hiki-gun,
Saitama 350-0395, Japan
Tel: +81-(0)49-296-7240
Fax: +81-(0)49-296-7247
Email: tarucha [at] riken.jp