Fig. 3: Sketches of the different types of spin cycloids in BiFeO3.
From: Antiferromagnetic textures in BiFeO3 controlled by strain and electric field
a, b Bulk-like spin cycloid (cycloid I) with the three possible propagation vectors for each polarisation variant in 3D view (a) and top view (b). c, d The exotic spin cycloid (cycloid II) with propagation vectors along the three <\(11\bar 2\) > directions in 3D view (c) and top view (d).
