Ground state for lattices of nonspherical ferromagnetic granules with dipole-dipole magnetic interaction

Summary form only given. In the paper, magnetic phase diagrams of regular 2D- and 3D-lattices of ellipsoidal single-domain ferromagnetic granules with dipole-dipole interaction are studied. Relying on the approximate, though accurate enough, expression for the pair interaction of nonspherical granules derived by the authors, numerical calculations of the magnetic energy for the considered systems are performed. It has been shown that, unlike the lattice of point (or spherical) magnetic moments whose ground state is always antiferromagnetic or frustrated (for the triangle lattice), the ground state of 2D-lattices composed of nonspherical granules might be ferromagnetic.