Self focusing Hybrid Skyrmions in spatially varying canted ferromagnetic systems

Abstract

Magnetic skyrmions are quasiparticle configurations in a magnetic film that can act as information carrying bits for ultrasmall, all-electronic nonvolatile memory. The skyrmions can be nucleated and driven by spin-orbit torque from a current driven in a heavy metal underlayer. Along its gyrotropic path, a Magnus force can cause a skyrmion to be annihilated at the boundaries. By combining interfacial and bulk Dzyaloshinskii-Moriya interactions (DMIs), for instance by using a B20 material on top of a heavy metal layer with high spin-orbit coupling, it is possible to engineer a hybrid skyrmion that will travel parallel to the racetrack with zero Magnus force. We show that by using a spatially varying interfacial DMI, a hybrid skyrmion will automatically self-focus onto such a track as its domain angle evolves along the path. Furthermore, using a gate driven voltage controlled magnetic anisotropy, we can control the trajectory of the hybrid skyrmion and its eventual convergence path and lane selection in a racetrack geometry.

arXiv comment4 pages, 4 figures

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Cited by in corpus (9)

• Computing and Memory Technologies based on Magnetic Skyrmions
• Curvature induced drift and deformation of magnetic skyrmions: comparison of ferro- and antiferromagnetic cases
• Tuning Dzyaloshinskii-Moriya Interaction in Ferrimagnetic GdCo: A First Principles Approach
• Optical-controlled ultrafast dynamics of skyrmion in antiferromagnets
• Temporal Memory with Magnetic Racetracks
• Nonzero Skyrmion Hall Effect in Topologically Trivial Structures
• Dynamics of hybrid magnetic skyrmion driven by spin-orbit torque in ferrimagnets
• Stabilization and helicity control of hybrid magnetic skyrmion
• Positional stability of skyrmions in a racetrack memory with notched geometry