Tutorial 1: Propagation vector of cycloid in BiFeO₃

This tutorial uses optmagk to determine the propagation vector $k$ of the spin cycloid in multiferroic BiFeO₃

The tutorial is split into sections in the m-file bifeo3.m. Each section can be run individually using the Ctrl+Enter shortcut. What the sections do is described in the comments.

The spin cycloid in BiFeO₃ arises due to the Dzyaloshinskii-Moriya interaction

If this would be zero, BiFeO₃ would have a simple G-type antiferromagnetic structure

The tutorial will lead you through the calculation of $k$ as a function of the strength of the DM and Heisenberg exchange interactions