Figure 1: Magnetic sublattices of GdIG.
From: Origin of the spin Seebeck effect in compensated ferrimagnets
(a) Iron garnet crystal structure. The tetrahedrally and octahedrally coordinated Fe3+ ions are highlighted. (b,c) The three different magnetic sublattices of GdIG shown for temperatures above (T>Tcomp) and below (T<Tcomp) the magnetic compensation temperature Tcomp. Due to the strong temperature dependence of the magnetic Gd sublattice (c sites), the Gd sublattice dominates the magnetic behaviour for T<Tcomp, while for T>Tcomp it is mainly caused by the antiferromagnetically coupled Fe sublattices (d and a sites). In the presence of a finite magnetic field, the net magnetization M points along the external magnetic field H. The direction and length of the coloured arrows represent the direction and magnitude of the magnetizations of the three magnetic sublattices.
