Spin waves stiffness in Dzyaloshinskii-Moriya helimagnet Cu2OSeO3 with the ferrimagnetic ordering

Григорьев, С. В. (Докладчик)

Деятельность: выступлениевыступление с устной презентацией

Описание

The energy landscape of the magnetic system determines both the resultant magnetic structure and magnetic excitations. This is clearly demonstrated for the cubic B20-type compounds with the Dzyaloshinskii-Moriya (DM) interaction. The competition between the ferromagnetic exchanged interaction and antisymmetric DM interaction leads to the appearance of the homochiral helical magnetic structure. The spin-waves dispersion in case of the fully polarized helimagnet with the DM interaction is shifted for the helix wavevector.
The small-angle neutron scattering is used to measure the spin-wave stiffness in the field-polarized state of Dzyaloshinskii-Moriya helimagnet Cu2OSeO3, which is ordered below TC = 58 K. The scattering map in the full-polarized state (i.e. above ) demonstrates two overlapped circles centred at the Bragg angles.
The spin wave stiffness was measured at different temperatures and magnetic fields. The temperature dependence of the spin-wave stiffness decreases slowly with temperature showing no softening close to the critical temperature.
Период26 июл 2018
Название событияInternational Research Symposium on Chiral Magnetism
Тип мероприятияКонференция
Номер конференции3
МестонахождениеНара, Япония
Степень признанияМеждународная

Ключевые слова

  • Spin wave stiffness
  • neutron scattering