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RIKEN Center for Emergent Matter Science Strong Correlation Quantum Structure Research Team

Team Leader: Takahisa Arima (Ph.D.)

Research Summary

Takahisa  Arima(Ph.D.)

Strongly correlated electron systems may exhibit various interesting emergent phenomena such as superconductivity, colossal magneto-resistance, and giant magneto-electric effects.  These emergent phenomena are directly associated with the spatial distributions as well as the spatial and temporal fluctuations of atoms, electron density, and spin density.  We are going to perform crystallographic and magnetic structure analyses, spectroscopies, and microscopies by using synchrotron x-rays, neutrons, and high-energy electron beams to reveal them.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Interdisciplinary Science & Engineering


  • x-ray
  • neutron
  • optical properties
  • multiferroics

Selected Publications

  • 1.Nakajima T., Oike H., Kikkawa A., Gilbert E. P., Booth N., Kakurai K., Taguchi Y., Tokura Y., Kagawa F., Arima T.,
    "Skyrmion lattice structural transition in MnSi",
    Sci. Adv. 3, e1602562 (2017).
  • 2.Morikawa D., Yu X. Z., Karube K., Tokunaga Y., Taguchi Y., Arima T., Tokura Y.,
    "Deformation of Topologically-Protected Supercooled Skyrmions in a Thin Plate of Chiral Magnet Co8Zn8Mn4",
    Nano Lett. 17, 1637 (2017).
  • 3.Nakajima T., Tokunaga Y., Matsuda M., Dissanayake S., Fernandez-Baca J., Kakurai K., Taguchi Y., Tokura Y., Arima T.,
    "Magnetic structures and excitations in a multiferroic Y-type hexaferrite BaSrCo2Fe11AlO22",
    Phys. Rev. B 94, 195154 (2016).
  • 4.Nakajima T., Takahashi Y., Kibayashi S., Matsuda M., Kakurai K., Ishiwata S., Taguchi Y., Tokura Y., Arima T.:
    "Electromagnon excitation in the field-induced noncollinear ferrimagnetic phase of Ba2Mg2Fe12O22 studied by polarized inelastic neutron scattering and terahertz time-domain optical spectroscopy"
    Phys. Rev. B 93, 035119 (2016).
  • 5.Yamasaki Y., Morikawa D., Honda T., Nakao H., Murakami Y., Kanazawa N., Kawasaki M., Arima T., Tokura Y.:
    "Dynamical process of skyrmion-helical magnetic transformation of the chiral-lattice magnet FeGe probed by small-angle resonant soft x-ray scattering"
    Phys. Rev. B 92, 220421(R) (2015).
  • 6.Morikawa D., Yu X. Z., Kaneko Y., Tokunaga Y., Nagai T., Kimoto K., Arima T., Tokura Y.:
    "Lorentz transmission electron microscopy on nanometric magnetic bubbles and skyrmions in bilayered manganites La1.2Sr1.8(Mn1−yRuy)2O7 with controlled magnetic anisotropy"
    Appl. Phys. Lett. 107, 212401 (2015).
  • 7.Nakajima T., Tokunaga Y., Taguchi Y., Tokura Y., Arima T.:
    "Piezomagnetoelectric Effect of Spin Origin in Dysprosium Orthoferrite"
    Phys. Rev. Lett. 115, 197205(2015).
  • 8.Nii Y., Nakajima T., Kikkawa A., Yamasaki Y., Ohishi K., Suzuki J., Taguchi Y., Arima T., Tokura Y., Iwasa Y.:
    "Uniaxial stress control of skyrmion phase"
    Nature Commun. 6, 8539 (2015).
  • 9.Tardif S., Takeshita S., Ohsumi H., Yamaura J., Okuyama D., Hiroi Z., Takata M., Arima T.:
    "All-In-All-Out Magnetic Domains: X-Ray Diffraction Imaging and Magnetic Field Control"
    Phys. Rev. Lett. 114, 147205 (2015).
  • 10.Nakajima T., Tokunaga Y., Kocsis V., Taguchi Y., Tokura Y., Arima T.:
    "Uniaxial-Stress Control of Spin-Driven Ferroelectricity in Multiferroic Ba2CoGe2O7"
    Phys. Rev. Lett. 114, 067201 (2015).

Recent Research Results

Related Links

Lab Members

Principal investigator

Takahisa Arima
Team Leader

Core members

Taro Nakajima
Research Scientist
Shang Gao
Postdoctoral Researcher
Kiyou Shibata
Special Postdoctoral Researcher
Yuichi Yamasaki
Senior Visiting Scientist

Contact Information

2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: takahisa.arima [at] riken.jp