TY  - JOUR
AU  - Dutta, Rajesh
AU  - Thoma, Henrik
AU  - Radelytskyi, Igor
AU  - Schneidewind, Astrid
AU  - Kocsis, Vilmos
AU  - Tokunaga, Yusuke
AU  - Taguchi, Yasujiro
AU  - Tokura, Yoshinori
AU  - Hutanu, Vladimir
TI  - Spin dynamics study and experimental realization of tunable single-ion anisotropy in multiferroic Ba 2 CoGe 2 O 7 under external magnetic fields
JO  - Physical review / B
VL  - 104
IS  - 2
SN  - 2469-9969
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2021-03224
SP  - L020403
PY  - 2021
AB  - We report a spin-wave study on multiferroic Ba2CoGe2O7 under magnetic fields up to 12 T using low-energyinelastic neutron scattering. In-plane transverse (T1) spin-wave modes are highly dispersive along (h00) andrather flat but strong in intensity along (30l). In addition, two dispersive electromagnon modes have beenobserved around 3.5 meV. Dispersion of the out-of-plane transverse modes (T2) under fields reveals that thesingle-ion anisotropy constant decreases with increasing magnetic field, which is consistent with the linearspin-wave theory. Our results imply that the field-dependent single-ion anisotropy plays a crucial role indetermining the characteristics of T2 and electromagnon modes in the three-dimensional anisotropic spin-wavespectrum.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000671585700003
DO  - DOI:10.1103/PhysRevB.104.L020403
UR  - https://juser.fz-juelich.de/record/894442
ER  -