Effect of Magnetic Dipole-Dipole Interactions on the Spin Orientation and Magnetic Ordering of the Spin-Ladder Compound Sr3Fe2O5

First-principles density functional theory calculations show that the spin-lattice of Sr3Fe2O5 is practically 2D in terms of its spin-exchange interactions. The magnetic dipole-dipole interactions are found to be essential for the 3D magnetic ordering of Sr3Fe2O5 at a very low temperature.