The magnetic structure of (Formula presented) is investigated by neutron diffraction in magnetic fields applied along several directions in the (Formula presented) plane of the crystal. In relatively weak fields, (Formula presented), the propagation vector of the spin spiral rotates to form a finite angle with the field direction. This angle depends on the orientation of (Formula presented) itself. The rotation of the propagation vector is accompanied by a reorientation of the plane of spin rotation in the spiral. The observed behavior is well described by a continuous-limit form of a free-energy functional that includes exchange and Dzyaloshinskii-Moriya interactions, as well as the Zeeman energy and an empirical anisotropy term.
|Number of pages
|Physical Review B - Condensed Matter and Materials Physics
|Published - 1997
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics