2020/01/13 by Xiao-Xiao Zhang, Lizhong Li, Daniel Weber +3 · 148 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Antiferromagnetism #Excitation #Kerr effect #Magnetic anisotropy #Magnetic properties of thin films #Monolayer #Resonance (particle physics) #Spin (aerodynamics) #Spin wave #Topological Materials and Phenomena #Ultrashort pulse #cond-mat.mes-hall
paper · pdf · doi:10.1038/s41563-020-0713-9
published in Nature Materials 19(8), 838-842 (Nature Portfolio)
arxiv created 2020/01/13 · openalex created_date 2020/01/23 · openalex publication_date 2020/06/22 · arxiv updated 2021/02/02 · openalex updated_date 2026/08/05
The emergence of two-dimensional (2D) layered magnetic materials has opened an exciting playground for both fundamental studies of magnetism in 2D and explorations of spinbased applications. Remarkable properties, including spin filtering in magnetic tunnel junctions and gate control of magnetic states, have recently been demonstrated in 2D magnetic materials. While these studies focus on the static properties, dynamic magnetic properties such as excitation and control of spin waves have remained elusive. Here we excite spin waves and probe their dynamics in antiferromagnetic CrI3 bilayers by employing an ultrafast optical pump/magneto-optical Kerr probe technique. We identify sub-terahertz magnetic resonances under an in-plane magnetic field, from which we determine the anisotropy and interlayer exchange fields and the spin damping rates. We further show tuning of antiferromagnetic resonances by tens of gigahertz through electrostatic gating. Our results shed light on magnetic excitations and spin dynamics in 2D magnetic materials, and demonstrate their unique potential for applications in ultrafast data storage and processing.