Spin Dynamics in van der Waals Magnetic Systems

Abstract

The discovery of atomic monolayer magnetic materials has stimulated intense research activities in the two-dimensional (2D) van der Waals (vdW) materials community. The field is growing rapidly and there has been a large class of 2D vdW magnetic compounds with unique properties, which provides an ideal platform to study magnetism in the atomically thin limit. In parallel, based on tunneling magnetoresistance and magneto-optical effect in 2D vdW magnets and their heterostructures, emerging concepts of spintronic and optoelectronic applications such as spin tunnel field-effect transistors and spin-filtering devices are explored. While the magnetic ground state has been extensively investigated, reliable characterization and control of spin dynamics play a crucial role in designing ultrafast spintronic devices. Ferromagnetic resonance (FMR) allows direct measurements of magnetic excitations, which provides insight into the key parameters of magnetic properties such as exchange interaction, magnetic anisotropy, gyromagnetic ratio, spin-orbit coupling, damping rate, and domain structure. In this review article, we present an overview of the essential progress in probing spin dynamics of 2D vdW magnets using FMR techniques. Given the dynamic nature of this field, we focus mainly on broadband FMR, optical FMR, and spin-torque FMR, and their applications in studying prototypical 2D vdW magnets. We conclude with the recent advances in laboratory- and synchrotron-based FMR techniques and their opportunities to broaden the horizon of research pathways into atomically thin magnets.

42 pages, 16 figures, 3 tables

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Cited by in corpus (11)

• Topological magnon gap engineering in van der Waals CrI${}_3$ ferromagnets
• Anisotropic magnetization dynamics in Fe5GeTe2 at room temperature
• Fundamentals and applications of Van der Waals magnets in magnon spintronics
• Electron Spin Resonance Spectroscopy on Magnetic Van der Waals Compounds
• Engineering of a Layered Ferromagnet via Graphitization: An Overlooked Polymorph of GdAlSi
• Writing and detecting topological charges in exfoliated Fe${}_{5-x}$GeTe${}_2$
• Intrinsic Spin Nernst Effect and Chiral Edge Modes in van der Waals Ferromagnetic Insulators: Dzyaloshinskii-Moriya vs. Kitaev Interactions
• Topological magnon-polaron transport in a bilayer van der Waals magnet
• Magnetic-field tuning of the spin dynamics in the quasi-2D van der Waals antiferromagnet CuCrP${}_2$S${}_6$
• Symmetry-forbidden intraband transitions leading to ultralow Gilbert damping in van der Waals ferromagnets
• Giant Exfoliation Induced Magnetic Coercivity in Fe${}_3$GaTe${}_2$