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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Grigoriev S. V., Pschenichnyi K. A., Altynbaev E. V., Heinemann A., Magrez A.,
Project Discovery and Nanoengineering of Novel Skyrmion-hosting Materials
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 99(5)
Page(s) 054427 - 054427
Title of proceedings Physical Review B
DOI 10.1103/physrevb.99.054427

Abstract

Small-angle neutron scattering is used to measure the spin-wave stiffness in the field-polarized state of the Dzyaloshinskii-Moriya helimagnet Cu2OSeO3, which is ordered below T-C = 58 K. The Dzyaloshinskii-Moriya interaction reflects itself in the anisotropic form of the spin-wave dispersion, epsilon(q) = A(q - k(s))(2) + g mu(B)(H - H-C2), which is seen as two round spots of the scattering intensity, though overlapping, on the left and right sides of the incident neutron beam. The spin-wave stiffness is equal to 76 +/- 1 meV angstrom(2) at low temperatures and decreases slowly with temperature, showing softening up to 39 +/- 3 meV angstrom(2) close to T-C. The temperature behavior of A resembles that of both the archetypical helimagnet MnSi and the archetypical ferrimagnet Fe3O4, supporting the concept of strong spin interactions within Cu-4 tetrahedra, representing essential magnetic building blocks of Cu(2)OSeO(3 )and thus forming its magnetic energy landscape.
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