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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.48: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Structural and magnetic chirality of the transition metal silicides Fe_1−xCo_xSi and Mn_1−xFe_xSi — •Dirk Menzel¹, Vadim Dyadkin², Sergey Grigoriev², Dmitry Chernishov³, Vladimir Dmitriev³, Evgeny Moskvin², Daniel Lamago⁴, Thomas Wolf⁵, Joachim Schoenes¹, Sergey Maleyev², and Helmut Eckerlebe⁶ — ¹Institut für Physik der Kondensierten Materie, TU Braunschweig, Germany — ²Petersburg Nuclear Physics Institute, Gatchina, Russia — ³Swiss-Norwegian Beamline, ESRF Grenoble, France — ⁴Laboratoire Léon Brillouin, Saclay, France — ⁵Institut für Festkörperphysik, KIT Karlsruhe, Germany — ⁶GKSS Forschungszentrum, Geesthacht, Germany

The crystallographic structure and the spin helix chirality of Fe_1−xCo_xSi (0.1 ≤ x ≤ 0.5) and Mn_1−xFe_xSi (0.06 ≤ x ≤ 0.29) single crystals were determined by X-ray diffraction using synchrotron radiation and polarized neutron small angle diffraction, respectively. A close relationship between the crystalline and the magnetic structures is observed: A left-handed structural configuration found in Fe_1−xCo_xSi corresponds to a right-handed magnetic helix and, vice versa, a right-handed structural helix reveals a left-handed spin helix. On the contrary, in Mn_1−xFe_xSi a left (right) handedness of the atomic structure coexists with a left (right) handedness of the spin helix. The origin of the complementary behavior is the sign of the Dzyaloshinsky-Moriya interaction which for a left-handed crystallographic configuration is positive in the Fe_1−xCo_xSi system and negative in the Mn_1−xFe_xSi compound.