Giant Dzyaloshinskii-Moriya interaction and ratchet motion of bimeronic excitations in two-dimensional magnets

Abstract

Topological magnetic excitations rooted in Dzyaloshinskii-Moriya interaction (DMI) are promising information carriers for next-generation memory and spintronic devices. The recently discovered two-dimensional (2D) magnets provide fertile new platforms for revealing rich physical phenomena with atomic-scale precision, as exemplified by the enhanced DMI associated with an effective electric field that breaks the inversion symmetry. Here we use first-principles calculations to establish a conceptually difierent compositional engineering approach to induce giant DMI in a representative CrMnI${}_6$ 2D magnet, and the underlying mechanism is rooted in the spontaneous inversion symmetry breaking in the bipartite system. Using atomistic magnetics simulations, we further reveal that bimeronic excitations can emerge upon cooling a spin random state or perturbing a ferromagnetic state. Strikingly, the bimeron can exhibit unidirectional soliton-like propagation, and such a ratchet phenomenon is highly desirable for racetrack memories. These findings may prove instrumental in developing novel devices for quantum information based on 2D magnets.

References in corpus (20)

• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Berry Phase Effects on Electronic Properties
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Anatomy of Dzyaloshinskii-Moriya Interaction at Co/Pt Interfaces
• Predicting the Spin-Lattice Order of Frustrated Systems from First-Principles
• Spectroscopic confirmation of linear relation between Heisenberg- and interfacial Dzyaloshinskii-Moriya-exchange in polycrystalline metal films
• Interplay between Kitaev interaction and single ion anisotropy in ferromagnetic CrI${}_3$ and CrGeTe${}_3$ monolayers
• Thermally Driven Ratchet Motion of Skyrmion Microcrystal and Topological Magnon Hall Effect
• Magnetic Skyrmion State in Janus Monolayers of Chromium Trihalides Cr(I,X)3
• Spirit: Multifunctional Framework for Atomistic Spin Simulations
• Possible Kitaev Quantum Spin Liquid State in 2D Materials with S=3/2
• Intrinsic skyrmions in monolayer Janus magnets
• Consistent model of magnetism in ferropnictides
• Meron-Like Topological Spin Defects in Monolayer CrCl3
• Current-Induced Dynamics and Chaos of Antiferromagnetic Bimerons
• Topological excitations in a Kagomé magnet
• Ab initio methodology for magnetic exchange parameters: \\Generic four-state energy mapping on Heisenberg spin Hamiltonian
• Skyrmions Driven by Intrinsic Magnons
• Unidirectional Magnon-Driven Domain Wall Motion Due to the Interfacial Dzyaloshinskii-Moriya Interaction
• Current-Controlled Skyrmionic Diode