Materials Design Division

Physics of Crystal Defects

小野瀬佳文 写真

Prof.Yoshinori ONOSE

  • Assoc. Prof. Yutaka OHNO

Spins make materials functional

In magnetic materials, peculiar spin structure and/or crystal structure frequently induce unconventional phenomena, which may afford advanced material functionalities. For example, transverse spiral states, in which spin moments rotate in the plane parallel to the spiral wave vector, show ferroelectricity.

The magnetically-induced ferroelectrics give rise to novel electromagnetic phenomena owing to the strong electromagnetic coupling. Another example is the spin swirling object denoted as Skyrmion, which also gives rise to unconventional phenomena due to the topological nature. This division studies such emergent phenomena and material functionalities induced by peculiar magnetic/crystal structures in magnetic materials.

spin, symmetry, topology
Microwave nonreciprocity (directional dichroism) in a conical magnetic structure

Microwave nonreciprocity (directional dichroism) in a conical magnetic structure (Nautre Communications 8, 15252 (2017)).

Excitation of surface acoustic wave on a multiferroic BiFeO3

Excitation of surface acoustic wave on a multiferroic BiFeO3 (Physical Review Applied 9, 034034 (2018))

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