Theoretical study on intense-excitation effects and optical functions of electromagnons in multiferroic materials View Homepage


Ontology type: schema:MonetaryGrant     


Grant Info

YEARS

2013-2016

FUNDING AMOUNT

4420000 JPY

ABSTRACT

I have theoretically predicted that interference of two activation channels inherent to electromagnon excitations in insulating chiral magnet Cu2OSeO3 leads to gigantic microwave directional dichroism, and have confirmed this prediction by a collaboration with experimental groups. I have also theoretically demonstrated that skyrmions can be created by applying electric fields on a thin-film sample of Cu2OSeO3 via an electrode tip, which is achieved by electric-field-driven local magnetization flop through magnetoelectric coupling in this multiferroic system. In addition, I have discovered a new insulating skyrmionic material GaV4S8, and have uncovered that skyrmions in this material are Neel-type one, which has not been discovered in any real material so far. We also theoretically revealed a microscopic mechanism of magnetic-field induced 90-degree flop of ferroelectric polarization in spin-spiral multiferroics TbMnO3, and have shown that this phenomenon occurs in a deterministic way. More... »

URL

https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-25870169

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