Dynamic symmetry breaking in chiral magnetic systems
arXiv:2102.07909 · doi:10.1002/adma.202101524
Abstract
The Dzyaloshinskii-Moriya interaction (DMI) in magnetic systems stabilizes spin textures with preferred chirality, applicable to next-generation memory and computing architectures. In perpendicularly magnetized heavy-metal/ferromagnet films, the interfacial DMI originating from structural inversion asymmetry and strong spin-orbit coupling favors chiral Néel-type domain walls (DWs) whose energetics and mobility remain at issue. Here, we characterize a new effect in which domains expand unidirectionally in response to a combination of out-of-plane and in-plane magnetic fields, with the growth direction controlled by the in-plane field strength. These growth directionalities and symmetries with applied fields cannot be understood from static treatments alone. We theoretically demonstrate that perpendicular field torques stabilize steady-state magnetization profiles highly asymmetric in elastic energy, resulting in a dynamic symmetry breaking consistent with the experimental findings. This phenomenon sheds light on the mechanisms governing the dynamics of Néel-type DWs and expands the utility of field-driven DW motion to probe and control chiral DWs.
arXiv comment20 pages, 4 figures, 10 supplementary figures
References in corpus (18)
- Skyrmion Lattice in a Chiral Magnet
- Skyrmions at room temperature : From magnetic thin films to magnetic multilayers
- Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
- Dynamics of Dzyaloshinskii domain walls in ultrathin magnetic films
- Tunable Room Temperature Magnetic Skyrmions in Ir/Fe/Co/Pt Multilayers
- Spectroscopic confirmation of linear relation between Heisenberg- and interfacial Dzyaloshinskii-Moriya-exchange in polycrystalline metal films
- Asymmetric Magnetic Domain-Wall Motion by the Dzyaloshinskii-Moriya Interaction
- Current-induced skyrmion generation and dynamics in symmetric bilayers
- Effect of interfacial intermixing on the Dzyaloshinskii-Moriya interaction in Pt/Co/Pt
- Chiral damping of magnetic domain walls
- Universal pinning energy barrier for driven domain walls in thin ferromagnetic films
- Direct measurement of interfacial Dzyaloshinskii-Moriya interaction in X/CoFeB/MgO heterostructures with a scanning-NV magnetometer
- Velocity asymmetry of Dzyaloshinskii domain walls in the creep and flow regimes
- Energetic molding of chiral magnetic bubbles
- The microscopic origin of DMI in magnetic bilayers and prediction of giant DMI in new bilayers
- Dispersive Stiffness of Dzyaloshinskii Domain Walls
- Magnetic properties, domain wall creep motion and the Dzyaloshinskii-Moriya interaction in Pt/Co/Ir thin films
- Creep of Chiral Domain Walls