2D correlations in the van der Waals ferromagnet CrBr${}_3$ using high frequency electron spin resonance spectroscopy

Abstract

Broadening the knowledge and understanding on the magnetic correlations in van der Waals layered magnets is critical in realizing their potential next-generation applications. In this study, we employ high frequency (240 GHz) electron spin resonance (ESR) spectroscopy on plate-like CrBr${}_3$ to gain insight into the magnetic interactions as a function of temperature (200 - 4 K) and the angle of rotation $\theta$. We find that the temperature dependence of the ESR linewidth is well described by the Ginzberg-Landau critical model as well as Berezinskii-Kosterlitz-Thouless (BKT) transition model, indicative of the presence of two-dimensional (2D) correlations. This suggests that the three-dimensional ferromagnet CrBr${}_3$, which has been described as an Ising or Heisenberg ferromagnet, could present 2D magnetic correlations and BKT-like behavior even in its bulk form; an observation that, to the best of our knowledge, has not been reported in the literature. Furthermore, our findings show that the resonance field follows a $(3co{s}^2\theta -1)$-like angular dependence, while the linewidth follows a $(3co{s}^2\theta -1{)}^2$-like angular dependence. This observed angular dependence of the resonance field and linewidth further confirm an unanticipated 2D magnetic behavior in CrBr${}_3$. This behavior is likely due to the interaction of the external magnetic field applied during the ESR experiment that allows for the mediation of long-range vortex-like correlations between the spin clusters that may have formed due to magnetic phase separation. This study demonstrates the significance of employing spin sensitive techniques such as ESR to better understand the magnetic correlations in similar van der Waals magnets.

arXiv comment6 pages, 5 figures, 1 table

References in corpus (14)

• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Strain-tunable magnetic anisotropy in monolayer CrCl${}_3$, CrBr${}_3$, and CrI${}_3$
• Direct observation of van der Waals stacking dependent interlayer magnetism
• Direct photoluminescence probing of ferromagnetism in monolayer two-dimensional CrBr3
• Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides
• Magnon-assisted tunnelling in van der Waals heterostructures based on CrBr3
• Fundamental Spin Interactions Underlying the Magnetic Anisotropy in the Kitaev Ferromagnet CrI${}_3$
• Magnetic anisotropy and spin-polarized two-dimensional electron gas in the van der Waals ferromagnet Cr${}_2$Ge${}_2$Te${}_6$
• Magnetic field-induced quantum phase transitions in a van der Waals magnet
• Evidence of the Berezinskii-Kosterlitz-Thouless Phase in a Frustrated Magnet
• Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets
• Berezinskii-Kosterlitz-Thouless Type Scenario in Molecular Spin Liquid $A$Cr${}_2$O${}_4$
• Unexpected Effectiveness of Berezinskii-Kosterlitz-Thouless Description of Electron Paramagnetic Resonance Linewidth Behaviour in the 3-Dimensional Manganite Bi${}_{0.5}$Sr${}_{0.5}$Mn${}_{0.9}$Cr${}_{0.1}$O${}_3$
• Berezinskii-Kosterlitz-Thouless transition in Josephson junction arrays

Cited by in corpus (3)

• Low-energy excitations and magnetic anisotropy of the layered van der Waals antiferromagnet Ni${}_2$P${}_2$S${}_6$
• Electron Spin Resonance Spectroscopy on Magnetic Van der Waals Compounds
• Evolution of the spin dynamics in the van der Waals system $M_{\text{2}}$P${}_{\text{2}}$S${}_{\text{6}}$ (${\mathbf{M}}_{\text{2}}$ = Mn${}_{\text{2}}$, MnNi, Ni${}_{\text{2}}$) series probed by electron spin resonance spectroscopy