Magnetism and spin dynamics in room-temperature van der Waals magnet Fe5GeTe2

摘要: Two-dimensional 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 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 c) and the ab-plane (H ab), with temperatures ranging from 300 to 10 K. We have found a sizable Landé g-factor difference between the H c and H 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 …