Enhanced skyrmion motion via strip domain wall

Abstract

When magnetic skyrmions move under spin orbit torque in magnetic nanowires, they experience a skyrmion Hall effect, which pushes them towards the nanowire edge where they risk being annihilated; this puts an upper limit on how fast they can be driven. However, the same magnetic multilayer harboring skyrmions can sustain a Néel-type strip domain wall along the nanowire length, potentially keeping the skyrmions separated from the edge. Here we study the interplay between current driven skyrmions and domain walls and find that they increase the annihilation current and allow the skyrmions to move faster. Based on the Thiele formalism, we confirm that the emergent longitudinal repulsive force and the modified energy landscape linked to the domain wall are responsible for the enhanced skyrmion motion. Furthermore, we identify that the longitudinal repulsive force emerges because of the broken axisymmetry in the local magnetization in front of the skyrmion. Our study uncovers key aspects in the interplay between two topological magnetic textures from different homotopy groups and may inspire new device concepts.

39 pages, 6 figures, 5 supplemental figures, and 5 supplemental tables

References in corpus (7)

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• Skyrmion Hall Effect Revealed by Direct Time-Resolved X-Ray Microscopy
• Theory of current-driven motion of Skyrmions and spirals in helical magnets
• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
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• Fundamental Theory of Current-Induced Motion of Magnetic Skyrmions
• Robust and programmable logic-in-memory devices exploiting skyrmion confinement and channeling using local energy barriers
• Spontaneous Skyrmion Conformal Lattice and Transverse Motion During dc and ac Compression
• Controllable Creation of Skyrmion Bags in a Ferromagnetic Nanodisk
• Dynamics and Nonmonotonic Drag for Individually Driven Skyrmions
• Field-driven skyrmion motion through velocity equipartition between skyrmions and a domain wall
• Current-driven motion of magnetic domain-wall skyrmions
• Deformation of a Néel-type Skyrmion in a Weak Inhomogeneous Magnetic Field: Magnetization Ansatz and Interaction with a Pearl Vortex
• Amplifying spin waves along Néel domain wall by spin-orbit torque