'bond',4)
        banb.addcoupling('mat','J5','bond',5)
    case -1
        banb.addcoupling('mat','J3','bond',5)
        banb.addcoupling('mat','J5','bond',4)
end

plot(banb,'range',[-0.5 1.5;-0.5 1.5;0 0.5],'atomLegend',false)
swplot.zoom(1.3)

%% Magnetic structure
% We fix the magnetic structure with the predefined chirality. The magnetic
% ordering wave vector is *k*=(0,0,e_H*1/7), the spins are lying in the
% *ab*-plane and we use a single cell to describe the structure (default
% value of nExt = [1 1