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Arima-Tokunaga Lab
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A lab that creates materials showing giant responses, such as changes in electrical properties under a magnetic field.
AboutAbout the lab
Creating solid materials with giant responses
The Arima-Tokunaga Lab develops solid-state materials that show large responses to magnetic and electric fields, and studies their properties experimentally.
The lab explores materials in which electron spins form unusual arrangements or electrons are distributed in unusual ways, looking for interesting phenomena.
Research proceeds by synthesizing target materials, examining the arrangement of electrons using synchrotron radiation and neutrons, and measuring whether the predicted phenomena actually occur.
Key terms
- Magnetoelectric effect
- A phenomenon in which applying a magnetic field changes a material's electric polarization, or applying an electric field changes its magnetization.
- Synchrotron radiation
- Very bright light, such as X-rays, emitted by electrons accelerated to nearly the speed of light. It can be used to examine the arrangement of atoms and electrons.
- Orbital ordering
- A state in which the orientation of the shapes over which electrons spread within atoms (orbitals) is regularly aligned throughout a crystal.
NewsLab news
A paper on the observation of structural phase transitions induced by electric current was published
A doctoral student received a Poster Award at the full-area meeting of a Transformative Research Areas project
A paper on X-ray diffuse scattering analysis of single crystals was published
A doctoral student received the Student Excellent Presentation Award from the Physical Society of Japan
In joint research with Shizuoka University and others, the structure of monolayer ice was visualized
ResearchResearch themes
The lab focuses on changes in material symmetry brought about by spin arrangements and electron distributions, and is opening up new material functions. Its research combines the exploration and design of materials, quantum beam measurements using synchrotron radiation and neutrons, and measurements of material functions.
*Illustrative imageMaterials whose electric polarization changes with a magnetic field
The lab studies materials that show a "giant magnetoelectric effect," in which applying a magnetic field greatly changes the electric polarization or the magnetization.
*Illustrative imageMaterials whose color differs between front and back
The lab studies special magneto-optical effects, such as the phenomenon in which color changes depending on whether light enters from the front or the back, and the Lorentz force for light.
*Illustrative imageMaterials whose shape changes with a magnetic field
Using spin-orbit coupling as a clue, the lab searches for the magnetic shape memory effect, in which shape changes as the alignment of electron orbitals (orbital ordering) is controlled by a magnetic field, as well as new elementary excitations in solids.
*Illustrative imageMaterials whose response to light polarization changes with an electric field
The lab studies materials whose properties with respect to the polarization of light change when an electric field is applied. These phenomena are related to the simultaneous breaking of time-reversal symmetry and spatial symmetry in strongly correlated solids.
MembersFaculty
The members of the Arima-Tokunaga Lab consist of faculty members, administrative assistants, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTakahisa Arima
- Associate ProfessorYusuke TokunagaPublications ↗
- Assistant ProfessorShunsuke KitouPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “SPring- img pano” en:User:Artorius / CC BY-SA 3.0 (cropped)
- Materials whose electric polarization changes with a magnetic field: “BTO crystal transition” Okapia2 / CC BY-SA 3.0 (cropped)
- Materials whose color differs between front and back: “Cordierite pléochroïsme” Didier Descouens / CC BY-SA 3.0 (cropped)
- Materials whose shape changes with a magnetic field: “Memory Spring Quadrat” DaniSMI / CC BY-SA 4.0 (cropped)
- Materials whose response to light polarization changes with an electric field: “Pockels cell modulaliing light polarization” Ben Smith / CC BY-SA 4.0 (cropped)
- Related lab (中島研究室): “J-PARC Materials and Life Science Experimental Facility Experimental Hall No. 1 Neutron Instruments” Kestrel / CC BY-SA 4.0 (cropped)
- Related lab (木村研究室): “Ilmenite-155036” Robert M. Lavinsky / CC BY-SA 3.0 (cropped)
- Related lab (芝内・石田研究室): “Quantum locking” Maxim Bilovitskiy / CC BY-SA 4.0 (cropped)
- Related lab (塚崎研究室): “Tetrahedral amorphous carbon thin film” Daniel Schwen / CC BY-SA 3.0 (cropped)
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