Magnetism and Spin Dynamics in Room-Temperature van der Waals Magnet Fe${}_5$GeTe${}_2$

Abstract

Two-dimensional (2D) van der Waals (vdWs) materials have gathered a lot of attention recently. However, the majority of these materials have Curie temperatures that are well below room temperature, making it challenging to incorporate them into device applications. In this work, we synthesized a room-temperature vdW magnetic crystal Fe${}_5$GeTe${}_2$ with a Curie temperature T${}_c=332$ K, and studied its magnetic properties by vibrating sample magnetometry (VSM) and broadband ferromagnetic resonance (FMR) spectroscopy. The experiments were performed with external magnetic fields applied along the c-axis (H$\parallel$c) and the ab-plane (H$\parallel$ab), with temperatures ranging from 300 K to 10 K. We have found a sizable Landé g-factor difference between the H$\parallel$c and H$\parallel$ab cases. In both cases, the Landé g-factor values deviated from g = 2. This indicates contribution of orbital angular momentum to the magnetic moment. The FMR measurements reveal that Fe${}_5$GeTe${}_2$ has a damping constant comparable to Permalloy. With reducing temperature, the linewidth was broadened. Together with the VSM data, our measurements indicate that Fe${}_5$GeTe${}_2$ transitions from ferromagnetic to ferrimagnetic at lower temperatures. Our experiments highlight key information regarding the magnetic state and spin scattering processes in Fe${}_5$GeTe${}_2$, which promote the understanding of magnetism in Fe${}_5$GeTe${}_2$, leading to implementations of Fe${}_5$GeTe${}_2$ based room-temperature spintronic devices.

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Cited by in corpus (22)

• Large-scale epitaxy of two-dimensional van der Waals room-temperature ferromagnet Fe5GeTe2
• Skyrmionic Spin Structures in Layered Fe5GeTe2 Up To Room Temperature
• Coexistence of Merons with Skyrmions in the Centrosymmetric van der Waals Ferromagnet Fe5GeTe2
• Spin Dynamics in van der Waals Magnetic Systems
• Anomalous resistivity upturn in the van der Waals ferromagnet Fe${}_5$GeTe${}_2$
• Low-energy excitations and magnetic anisotropy of the layered van der Waals antiferromagnet Ni${}_2$P${}_2$S${}_6$
• Unusual magnetotransport and anomalous Hall effect in quasi-two-dimensional van der Waals ferromagnet Fe${}_4$GeTe${}_2$
• Evidence of Magnon-Mediated Orbital Magnetism in a Quasi-2D Topological Magnon Insulator
• Thermal cycling induced alteration of the stacking order and spin-flip in the room temperature van der Waals magnet Fe${}_5$GeTe${}_2$
• (Fe${}_{1-x}$Ni${}_x$)${}_5$GeTe${}_2$: an antiferromagnetic triangular Ising lattice with itinerant magnetism
• Disentangling the unusual magnetic anisotropy of the near-room-temperature ferromagnet Fe${}_4$GeTe${}_2$
• Anisotropic magnetization dynamics in Fe5GeTe2 at room temperature
• Magnetic anisotropy and low-energy spin dynamics in the van der Waals compounds Mn${}_2$P${}_2$S${}_6$ and MnNiP${}_2$S${}_6$
• Electron Spin Resonance Spectroscopy on Magnetic Van der Waals Compounds
• Writing and detecting topological charges in exfoliated Fe${}_{5-x}$GeTe${}_2$
• Flat bands and magnetism in $\mathbf{F}{\mathbf{e}}_4\mathbf{GeT}{\mathbf{e}}_2$ and $\mathbf{F}{\mathbf{e}}_5\mathbf{GeT}{\mathbf{e}}_2$ due to bipartite crystal lattices
• 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
• Tuning magnetic anisotropy in Fe${}_5$GeTe${}_2$ monolayer through doping and strain
• Dzyaloshinskii-Moriya interaction in Fe5GeTe2 epitaxial thin films
• Quantum Imaging of Ferromagnetic van der Waals Magnetic Domain Structures at Ambient Conditions
• Quenching the Non-Collinear Spin Order in High-Tc Layered Ferromagnet Fe5GeTe2
• Symmetry-forbidden intraband transitions leading to ultralow Gilbert damping in van der Waals ferromagnets