Thermal stability and topological protection of skyrmions in nanotracks

Abstract

Magnetic skyrmions are hailed as a potential technology for data storage and other data processing devices. However, their stability against thermal fluctuations is an open question that must be answered before skyrmion-based devices can be designed. In this work, we study paths in the energy landscape via which the transition between the skyrmion and the uniform state can occur in interfacial Dzyaloshinskii-Moriya finite-sized systems. We find three mechanisms the system can take in the process of skyrmion nucleation or destruction and identify that the transition facilitated by the boundary has a significantly lower energy barrier than the other energy paths. This clearly demonstrates the lack of the skyrmion topological protection in finite-sized magnetic systems. Overall, the energy barriers of the system under investigation are too small for storage applications at room temperature, but research into device materials, geometry and design may be able to address this.

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• Controlled Creation of Quantum Skyrmions
• Current-driven skyrmion Depinning in Magnetic Granular Films
• Multiscale simulations of topological transformations in magnetic Skyrmions
• Skyrmion states in thin confined polygonal nanostructures
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• Toward room-temperature nanoscale skyrmions in ultrathin films
• Real-space observation of skyrmion clusters with mutually orthogonal skyrmion tubes
• Writing Skyrmions with a Magnetic Dipole
• Microscopic Theory of Ultrafast Skyrmion Excitation by Light
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• A micromagnetic theory of skyrmion lifetime in ultrathin ferromagnetic films
• The effect of boundary-induced chirality on magnetic textures in thin films
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• Engineering antiferromagnetic skyrmions and antiskyrmions at metallic interfaces
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• Intrinsic mixed Bloch-Néel character and chirality switch of skyrmions in asymmetric epitaxial trilayer
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• Ultrasensitive Sub-monolayer Palladium Induced Chirality Switching and Topological Evolution of Skyrmions
• Metastable magnetic bubble in [Co/Pd]4/Py multilayers
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• Composite Skyrmion bags in two-dimensional materials
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• Square skyrmion lattice in multiorbital $f$-electron systems
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• Positional stability of skyrmions in a racetrack memory with notched geometry