Stabilized biskyrmion states in annealed CoFeB bilayer with different interfaces
arXiv:2502.16201 · doi:10.1016/j.mtelec.2025.100166
Abstract
This study investigates the stability of skyrmions and biskyrmions in perpendicular magnetic tunneling junctions with a thick CoFeB/Ta/CoFeB free layer. The samples showed a magnetoresistance of ~ 41% when annealed at 230 °C. Magnetic force microscopy revealed the existence of skyrmions and biskyrmions at room temperature in the as-deposited state and under an external magnetic field. Annealing at 330 °C enhanced interfacial Dzyaloshinskii-Moriya interaction (DMI) and crystallinity, enabling the spontaneous coexistence of these topological structures. Micromagnetic simulations using MuMax3 explored the interplay between DMI strength, sign, and skyrmion chirality. Skyrmions exhibited repulsive interactions, while biskyrmions displayed attractive interactions due to the difference in helicities. The study highlights the influence of multilayer structure and varying Ta layer thicknesses on the DMI charility, which modulates the formation of complex spin textures. These results provide an understanding of skyrmion and biskyrmion dynamics and their potential for spintronic applications, including racetrack memory and data storage technologies.
7 pages, 5 figures
References in corpus (20)
- The design and verification of Mumax3
- Spin Transfer Torques in MnSi at Ultra-low Current Densities
- Emergent electrodynamics of skyrmions in a chiral magnet
- Discovery of Magnetic Antiskyrmions Beyond Room Temperature in Tetragonal Heusler Materials
- Beyond skyrmions: Review and perspectives of alternative magnetic quasiparticles
- Skyrmion-skyrmion and skyrmion-edge repulsions in skyrmion-based racetrack memory
- A centrosymmetric hexagonal magnet with superstable biskyrmion magnetic nanodomains in a wide temperature range of 100K to 340K
- Magnetic Skyrmion Bundles and Their Current-Driven Dynamics
- Real-space imaging of confined magnetic skyrmion tubes
- Chiral Magnetic Skyrmions with Arbitrary Topological Charge ("skyrmionic sacks")
- Unveiling the three-dimensional spin texture of skyrmion tubes
- Synthesizing Skyrmion Molecules in Fe-Gd Thin Films
- Effect of annealing on the interfacial Dzyaloshinskii-Moriya interaction in Ta/CoFeB/MgO trilayers
- Skyrmion-Skyrmion Interaction in a Magnetic Film
- Oriented Three-Dimensional Magnetic Biskyrmion in MnNiGa Bulk Crystals
- Controlling skyrmion helicity via engineered Dzyaloshinskii-Moriya interactions
- Generation and stability of dynamical skyrmions and droplet solitons
- Three-dimensional structure and formation mechanism of biskyrmions in uniaxial ferromagnets
- Thermal Stability of Skyrmion Tubes in Nanostructured Cuboids
- Dynamics of interacting skyrmions in magnetic nano-track