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Masuda Lab
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This lab uses neutrons to observe spin dynamics in magnetic materials and search for new quantum phenomena.
AboutAbout the lab
The quantum world of magnetic materials, seen through neutrons
The Masuda Lab conducts experiments to discover new quantum phenomena in materials with magnetic properties (magnetism) and to uncover how they arise.
It combines three approaches: synthesizing new materials, measuring physical properties in the lab, and carrying out neutron scattering experiments at large facilities such as accelerators and nuclear reactors.
Recently, the lab has been working on observing spin waves with neutrons in altermagnets, which are attracting attention as the third class of magnetic materials.
The lab is also developing a new neutron spectrometer that can efficiently measure the dynamics of materials.
Key terms
- Neutron scattering
- A method in which neutrons are directed at a material, and the arrangement of atoms and the direction and motion of spins are studied from how the neutrons scatter.
- Magnon
- A wave-like propagation of fluctuations in spin direction within a magnetic material.
- Altermagnet
- A new class of magnetic material that has no net magnetization overall but also shows properties similar to those of a ferromagnet.
NewsLab news
Succeeded in controlling altermagnetic domains with a magnetic field and observed them by polarized neutron diffraction
Observed switchable chiral magnons in an altermagnet; the paper was highlighted by Phys. Rev. Lett.
Experimentally verified the d-wave altermagnet La2O3Mn2Se2 by neutron scattering
Paper on collaborative research on kagome magnets published in Phys. Rev. Lett.
A doctoral student received the Outstanding Student Presentation Award from the Physical Society of Japan
ResearchResearch themes
The lab aims to discover new quantum phenomena and quantum states in a variety of magnetic materials through experiments, and to uncover how they arise. In addition to material synthesis and physical property measurements, it investigates the dynamics of spins inside magnetic materials through neutron scattering experiments at large facilities.
*Illustrative imageChiral Magnons in Altermagnets
As part of an international collaborative team, the lab used polarized neutron scattering to directly observe magnons with right-handed and left-handed rotation (chiral magnons) in MnTe, an altermagnet known as the third class of magnetic materials. The team also showed that the direction of rotation can be switched with an external magnetic field.
*Illustrative imageConfirming d-wave Altermagnets with Neutrons
In La2O3Mn2Se2, a candidate d-wave altermagnet, the lab carried out neutron scattering experiments using a spectrometer at J-PARC and revealed the behavior of its magnetic excitations for the first time. In collaboration with the High Energy Accelerator Research Organization (KEK) and others, the lab experimentally confirmed the interactions that characterize d-wave altermagnets.
*Illustrative imageDirac Magnons in a Honeycomb-Lattice Magnet
Neutron scattering experiments on single crystals of NiTiO3, a magnetic material with a honeycomb lattice, confirmed the formation of a "Dirac cone," in which the magnon dispersions cross linearly. This research applies the concept of topology, known from the physics of electrons, to magnons.
*Illustrative imageDevelopment of a New Neutron Spectrometer
The lab is developing HODACA, a new neutron spectrometer that efficiently measures the dynamics of materials. By using HODACA, installed at a research reactor, together with the HRC spectrometer at J-PARC, the lab will search for new quantum phenomena.
MembersFaculty
The members of the Masuda Lab consist of faculty, project researchers, technical assistants, and doctoral and master's students.As of 2026
- ProfessorTakatsugu MasudaPublications ↗
- Assistant ProfessorShinichiro Asai
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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: “NCNR Guide Hall ( )” National Institute of Standards and Technology / Public domain (cropped)
- Chiral Magnons in Altermagnets: “Spin wave” Jacopo Bertolotti / CC0 (cropped)
- Confirming d-wave Altermagnets with Neutrons: “J-PARC Main Ring P7311328” Kestrel / CC BY-SA 4.0 (cropped)
- Dirac Magnons in a Honeycomb-Lattice Magnet: “Graphen” AlexanderAlUS / CC BY-SA 3.0 (cropped)
- Development of a New Neutron Spectrometer: “Neutron Research facility ( )” National Institute of Standards and Technology / Public domain (cropped)
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