Spin stiffness of chromium-based van der Waals ferromagnets

Abstract

Low temperature magnetization of CrI3, CrSiTe3 and CrGeTe3 single crystals were systematically studied. Based on the temperature dependence of extrapolated spontaneous magnetization from magnetic isotherms measured at different temperatures, the spin stiffness constant (D) and spin excitation gap ($\Delta$) were extracted according to Bloch's law. For spin stiffness, D is estimated to be 27$\pm$6 meV ${\mathring{A}}^2$, 20$\pm$3 meV ${\mathring{A}}^2$ and 38$\pm$7 meV ${\mathring{A}}^2$ for CrI3, CrSiTe3 and CrGeTe3 respectively. Spin excitation gaps determined via Bloch's formulation have larger error bars yielding 0.59$\pm$0.34 meV (CrI3), 0.37$\pm$0.22 meV (CrSiTe3) and 0.28$\pm$0.19 meV (CrGeTe3). Among all three studied compounds, larger spin stiffness value leads to higher ferromagnetic transition temperature.

arXiv comment5 figures

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Cited by in corpus (4)

• Synthesis and physical properties of a new layered ferromagnet, Cr1.21Te2
• Growth of high-quality CrI3 single crystals and engineering of its magnetic properties via V and Mn doping
• Magnetotransport in ferromagnetic Fe${}_2$Ge semimetallic thin films
• Dimension-Dependent Critical Scaling Analysis and Emergent Competing Interaction Scales in a 2D Van der Waals magnet Cr${}_2$Ge${}_2$Te${}_6$