Regensburg 2010 – wissenschaftliches Programm
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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 Fe1−xCoxSi and Mn1−xFexSi — •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 Fe1−xCoxSi (0.1 ≤ x ≤ 0.5) and Mn1−xFexSi (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 Fe1−xCoxSi 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 Mn1−xFexSi 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 Fe1−xCoxSi system and negative in the Mn1−xFexSi compound.