RKKY to DMI: Study of spin-wave dynamics of Fe-doped MnGe by SANS
The helical magnetic structure of B20-type compounds caused by the hierarchy of exchange interaction: main ferromagnetic exchange interaction, J, together with the antisymmetric Dzyaloshinskii-Moryia (DM) interaction, D, stabilize the helical (homochiral) structure in these systems below Tc, and the weakest cubic anisotropy direct the spin helix along the main axis of the structure. The presence of the DM chiral interaction leads to the chirality of the spin-waves in the field-polarized state of the helimagnets. Contrary to the ordinary DM helical magnets, the MnGe compound possess a short period spin helix, reminiscent more the RKKY type of the spirals. In case of symmetrical exchange interaction the dispersion relation of the magnons should give an isotropic scattering pattern. Taking into account that the magnetic system of FeGe is based on DMI while MnGe shows the RKKY-like magnetic structure, the transition from one type of the magnetic structure to another should appear with Fe-replacement of the Mn. The general aim of the proposed experiment is to follow the evolution of the ratio between two main interactions, which determine the helical magnetic order in Mn1−xFexGe.
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ALTYNBAEV Evgeniy; CHERNYSHOV Dmitry; DIADKIN Vadim; S.V. Grigoriev; HONECKER Dirk; KOSAKA Yusuke and MENZEL Dirk. (2018). RKKY to DMI: Study of spin-wave dynamics of Fe-doped MnGe by SANS. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-284
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