Magnetic Dipole Interactions in Crystals

TL;DR

This paper investigates how magnetic dipole interactions affect the magnetic properties of spin systems in crystals, providing theoretical predictions and comparisons with experimental results for various magnetic structures.

Contribution

It extends the understanding of magnetic dipole interactions by calculating eigenvalues, eigenvectors, and easy axes for diverse spin lattices and magnetic configurations.

Findings

Eigenvalues and eigenvectors of MDI tensor determined for various lattices

Predicted easy axes match experimental results for antiferromagnetic compounds

Generalized theory to include noncollinear antiferromagnetic structures

Abstract

The influence of magnetic dipole interactions (MDIs) on the magnetic properties of local-moment spin systems is investigated. The eigenvalues and eigenvectors of the MDI tensor are determined for a wide variety of spin lattices and magnetic wavevectors in the magnetically ordered state with collinear moment alignments. The predicted easy axes in the ordered state are compared with experimental results for antiferromagnetic (AFM) compounds. The theory is generalized to include noncollinear AFM structures and compared with experiments. Many properties caused or influenced by MDIs in the ordered and paramagnetic states are calculated within Weiss molecular field theory.