Research output: Contribution to journal › Article › peer-review
Spin-wave stiffness in the Dzyaloshinskii-Moriya helimagnet with ferrimagnetic ordering Cu2OSeO3. / Grigoriev, S. V.; Pschenichnyi, K. A.; Altynbaev, E. V.; Heinemann, A.; Magrez, A.
In: Physical Review B, Vol. 99, No. 5, 054427, 25.02.2019.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Spin-wave stiffness in the Dzyaloshinskii-Moriya helimagnet with ferrimagnetic ordering Cu2OSeO3
AU - Grigoriev, S. V.
AU - Pschenichnyi, K. A.
AU - Altynbaev, E. V.
AU - Heinemann, A.
AU - Magrez, A.
N1 - Publisher Copyright: © 2019 American Physical Society. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/2/25
Y1 - 2019/2/25
N2 - 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 TC=58 K. The Dzyaloshinskii-Moriya interaction reflects itself in the anisotropic form of the spin-wave dispersion, ϵq=A(q-ks)2+gμB(H-HC2), 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 Å2 at low temperatures and decreases slowly with temperature, showing softening up to 39±3 meV Å2 close to TC. 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 Cu4 tetrahedra, representing essential magnetic building blocks of Cu2OSeO3 and thus forming its magnetic energy landscape.
AB - 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 TC=58 K. The Dzyaloshinskii-Moriya interaction reflects itself in the anisotropic form of the spin-wave dispersion, ϵq=A(q-ks)2+gμB(H-HC2), 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 Å2 at low temperatures and decreases slowly with temperature, showing softening up to 39±3 meV Å2 close to TC. 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 Cu4 tetrahedra, representing essential magnetic building blocks of Cu2OSeO3 and thus forming its magnetic energy landscape.
KW - helimagnets
KW - SANS
KW - polarized neutrons
UR - http://www.scopus.com/inward/record.url?scp=85062525380&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.99.054427
DO - 10.1103/PhysRevB.99.054427
M3 - Article
AN - SCOPUS:85062525380
VL - 99
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 5
M1 - 054427
ER -
ID: 76659050