Electron Spin Resonance Spectroscopy on Magnetic Van der Waals Compounds

TL;DR

This paper reviews recent advances in Electron Spin Resonance spectroscopy applied to magnetic van der Waals compounds, highlighting its role in understanding their magnetic properties and spin dynamics across various structures and compositions.

Contribution

It provides a comprehensive overview of ESR techniques and recent findings in magnetic van der Waals materials, including topological insulators.

Findings

Enhanced understanding of spin structures in magnetic van der Waals compounds

Insights into low-energy spin dynamics in ordered and paramagnetic phases

Application of ESR to diverse crystal structures and compositions

Abstract

The field of research on magnetic van der Waals compounds -- a special subclass of quasi-two-dimensional materials -- is currently rapidly expanding due to the relevance of these compounds to fundamental research where they serve as a playground for the investigation of different models of quantum magnetism and also in view of their unique magneto-electronic and magneto-optical properties pertinent to novel technological applications. The Electron Spin Resonance (ESR) spectroscopy plays an important role in the exploration of the rich magnetic behavior of van der Waals compounds due to its high sensitivity to magnetic anisotropies and unprecedentedly high energy resolution that altogether enable one to obtain thorough insights into the details of the spin structure in the magnetically ordered state and the low-energy spin dynamics in the ordered and paramagnetic phases. This article provides an overview of the recent achievements in this field made by the ESR spectroscopic techniques encompassing representatives of antiferro- and ferromagnetic van der Waals compounds of different crystal structures and chemical composition as well as of a special category of these materials termed magnetic topological insulators.