Dipolar skyrmions and antiskyrmions of arbitrary topological charge at room temperature

Abstract

Magnetic skyrmions are localized, stable topological magnetic textures that can move and interact with each other like ordinary particles when an external stimulus is applied. The efficient control of the motion of spin textures using spin-polarized currents opened an opportunity for skyrmionic devices such as racetrack memory and neuromorphic or reservoir computing. The coexistence of skyrmions with high topological charge in the same system promises further possibilities for efficient technological applications. In this work, we directly observe dipolar skyrmions and antiskyrmions with arbitrary topological charge in Co/Ni multilayers at room temperature. We explore the dipolar-stabilized spin objects with topological charges of up to 10 and characterize their nucleation process, their energy dependence on the topological charge and the effect of the material parameters on their stability. Furthermore, our micromagnetic simulations demonstrate spin-transfer-induced motion of these spin objects, which is important for their potential device application.

High-resolution imaging of 3D stray-field components with a Fe3O4 nanoparticle sensor

“…Understanding the mechanism of nanomagnetism underpins the development of future spintronic devices. [1][2][3][4][5][6][7][8][9][10][11][12] The development of magnetic imaging techniques, including scanning transmission X-ray microscopy, magneto-optical Kerr microscopy, Lorentz microscopy, resonant magnetic X-ray imaging, nanoprobe-based near-field mapping, and optical near-field imaging, [13][14][15][16][17][18] have facilitated the research on nanoscale spin-textures for spintronic applications. Additionally, recent advances in near-field Brillouin light scattering, timeresolved X-ray microscopy etc.…”

Laser‐Induced Real‐Space Topology Control of Spin Wave Resonances

“…Magnetic spin textures are expected to be an important building block for future spintronic-and magnonic-based memory and logic devices, and even for unconventional computing techniques such as neuromorphic computing. [1][2][3][4][5][6][7] Especially, localized magnetic solitons, known as skyrmions, have attracted significant attention to be utilized in spin texture based devices. [8][9][10] Potential applications of magnetic textures include the engineering of spin wave dispersions in magnonic crystals, using magnetic textures as spin wave Fe and Gd with composition [Fe(0.35 nm)/Gd(0.40 nm)] 160 deposited on a thermally-oxidized Si(100) substrate.…”