Observation of Magnetic Radial Vortex Nucleation in a Multilayer Stack with Tunable Anisotropy
arXiv:1709.02876 · doi:10.1038/s41598-018-25392-x
Abstract
Recently discovered exotic magnetic configurations, namely magnetic solitons appearing in the presence of bulk or interfacial Dzyaloshinskii-Moriya Interaction (i-DMI), have excited scientists to explore their potential applications in emerging spintronic technologies such as race-track magnetic memory, spin logic, radio frequency nano-oscillators and sensors. Such studies are motivated by their foreseeable advantages over conventional micro-magnetic structures due to their small size, topological stability and easy spin-torque driven manipulation with much lower threshold current densities giving way to improved storage capacity, and faster operation with efficient use of energy. In this work, we show that in the presence of i-DMI in Pt/CoFeB/Ti multilayers by tuning the magnetic anisotropy (both in-plane and perpendicular-to-plane) via interface engineering and postproduction treatments, we can stabilize a variety of magnetic configurations such as Néel skyrmions, horseshoes and most importantly for the first time, the recently predicted isolated radial vortices at room temperature and under zero bias field. Especially, the radial vortex state with its absolute convergence to or divergence from a single point can potentially offer exciting new applications such as particle trapping/detrapping in addition to magnetoresistive memories with efficient switching, where the radial vortex state can act as a source of spin-polarized current with radial polarization.
arXiv comment26 pages, 5 figures
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Cited by in corpus (7)
- Three-Dimensional Chiral Magnetization Structures in FeGe Nanospheres
- Effect of Dzyaloshinskii-Moriya interaction on magnetic vortex switching driven by radial spin waves
- Skyrmion Lattice Collapse and Defect-Induced Melting in Chiral Magnetic Films
- Nano-engineering the evolution of skyrmion crystal in synthetic antiferromagnets
- Stabilization and dynamics of magnetic antivortices in a nanodisk with anisotropic Dzyaloshinskii-Moriya interaction
- Skyrmion formation in nanodiscs using magnetic force microscopy tip
- Dynamic Fingerprints of Synthetic Antiferromagnet Nanostructures with Interfacial Dzyaloshinskii-Moriya Interaction