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Two-dimensional (2D) van der Waals (vdWs) materials have gathered a lot ofattention recently. However, the majority of these materials have Curietemperatures that are well below room temperature, making it challenging toincorporate them into device applications. In this work, we synthesized aroom-temperature vdW magnetic crystal Fe$_5$GeTe$_2$ with a Curie temperatureT$_c = 332$ K, and studied its magnetic properties by vibrating samplemagnetometry (VSM) and broadband ferromagnetic resonance (FMR) spectroscopy.The experiments were performed with external magnetic fields applied along thec-axis (H$\parallel$c) and the ab-plane (H$\parallel$ab), with temperaturesranging from 300 K to 10 K. We have found a sizable Land\'e g-factor differencebetween the H$\parallel$c and H$\parallel$ab cases. In both cases, the Land\'eg-factor values deviated from g = 2. This indicates contribution of orbitalangular momentum to the magnetic moment. The FMR measurements reveal thatFe$_5$GeTe$_2$ has a damping constant comparable to Permalloy. With reducingtemperature, the linewidth was broadened. Together with the VSM data, ourmeasurements indicate that Fe$_5$GeTe$_2$ transitions from ferromagnetic toferrimagnetic at lower temperatures. Our experiments highlight key informationregarding the magnetic state and spin scattering processes in Fe$_5$GeTe$_2$,which promote the understanding of magnetism in Fe$_5$GeTe$_2$, leading toimplementations of Fe$_5$GeTe$_2$ based room-temperature spintronic devices.

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