Generation of magnetic skyrmion bubbles by inhomogeneous spin Hall currents

Abstract

Recent experiments have shown that magnetic skyrmion bubbles can be generated and injected at room temperature in thin films [W. Jiang et al, Science vol. 349, 283 (2015)]. Here, we demonstrate, using micromagnetic modeling, that such skyrmions can be generated by an inhomogeneous spin Hall torque in the presence of Dzyaloshinskii-Moriya interactions (DMIs). In the experimental Ta/Co${}_{20}$Fe${}_{60}$B${}_{20}$ thin films, the DMI is rather small; nevertheless, the skyrmion bubbles are stable, or at least metastable on observational time scales.

arXiv comment5 pages, 4 figures

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• Skyrmion-electronics: Writing, deleting, reading and processing magnetic skyrmions toward spintronic applications
• Room-temperature current-induced generation and motion of sub-100nm skyrmions
• Current-induced skyrmion generation and dynamics in symmetric bilayers
• Electrical signature of individual magnetic skyrmions in multilayered systems
• Skyrmions in magnetic tunnel junctions
• Asymmetric skyrmion Hall effect in systems with a hybrid Dzyaloshinskii-Moriya interaction
• Skyrmion production on demand by homogeneous DC currents
• Simultaneous control of the Dzyaloshinskii-Moriya interaction and magnetic anisotropy in nanomagnetic trilayers
• Topologically non-trivial magnon bands in artificial square spin ices subject to Dzyaloshinskii-Moriya interaction
• Creation,transport and detection of imprinted magnetic solitons stabilized by spin-polarized current
• Generation and Hall effect of skyrmions enabled via using nonmagnetic point contacts
• Unidirectional Magnon-Driven Domain Wall Motion Due to the Interfacial Dzyaloshinskii-Moriya Interaction
• Current-induced nucleation and motion of zero field skyrmion
• Controllable Creation of Skyrmion Bags in a Ferromagnetic Nanodisk
• Topological Hall effect in diffusive ferromagnetic thin films with spin-flip scattering
• Strings and skyrmions on domain walls
• Tailoring Magnetic Skyrmions by Geometric Confinement of Magnetic Structures
• Transverse instabilities of stripe domains in magnetic thin films with perpendicular magnetic anisotropy
• Skyrmion nucleation via localized spin current injection in confined nanowire geometry in low chirality magnetic materials