Importance of stacking to the collinear magnetic phases of the geometrically frustrated antiferromagnet CuFeO2

The correct stacking of hexagonal layers is used to obtain accurate estimates for the exchange and anisotropy parameters of the geometrically frustrated antiferromagnet CuFeO2. Those parameters are highly constrained by the stability of a collinear metamagnetic phase between fields of 13.5 and 20 T. Constrained fits of the spin-wave frequencies of the collinear up arrow up arrow down arrow down arrow phase below 7 T are used to identify the magnetic unit cell of the metamagnetic up arrow up arrow up arrow down arrow down arrow phase, which contains two hexagonal layers and 10 Fe3+ spins.