Pressure dependent magnetic properties on bulk CrBr3 single crystals

TL;DR

This study investigates how hydrostatic pressure influences the magnetic properties of bulk CrBr3, revealing significant decreases in magnetization and subtle changes in magnetic anisotropy and exchange interactions, supported by both experiments and theoretical calculations.

Contribution

It provides new insights into pressure effects on magnetic properties of CrBr3, combining experimental measurements with density functional theory calculations.

Findings

72% decrease in saturation magnetization under pressure

Curie temperature decreases from 33 K to 29 K with pressure

Magnetocrystalline anisotropy energy remains nearly unchanged

Abstract

The van der Waals class of materials offer an approach to two-dimensional magnetism as their spin fluctuations can be tuned upon exfoliation of layers. Moreover, it has recently been shown that spin-lattice coupling and long-range magnetic ordering can be modified with pressure in van der Waals materials. In this work, the magnetic properties of quasi two-dimensional CrBr3 are reported applying hydrostatic pressure. The application of pressure (0 - 0.8 GPa) shows a 72 % decrease in saturation magnetization with small decrease in the Curie temperature from 33 to 29 K. Density functional theory calculations with pressure up to 1 GPa show a reduction in volume and interplanar distance as pressure increases. To further understand magnetic properties with applied pressure, the magnetocrystalline anisotropy energy (MAE) and exchange coupling parameter (J) are calculated. There is minimal decrease in MAE and the first nearest neighbor interaction (J1) (U = 2.7 eV and J = 0.7 eV), shows an increase in J1 with respect to pressure. Overall, CrBr3 displays ferromagnetic interlayer coupling and the calculated exchange coupling and MAE parameters match well with the observations from the experimental work.