Stable and manipulable Bloch point

Abstract

The prediction of magnetic skyrmions being used to change the way we store and process data has led to materials with Dzyaloshinskii-Moriya interaction coming into the focus of intensive research. So far, studies have looked mostly at magnetic systems composed of materials with single chirality. In a search for potential future spintronic devices, combination of materials with different chirality into a single system may represent an important new avenue for research. Using finite element micromagnetic simulations, we study an FeGe disk with two layers of different chirality. We show that for particular thicknesses of layers, a stable Bloch point emerges at the interface between two layers. In addition, we demonstrate that the system undergoes hysteretic behaviour and that two different types of Bloch point exist. These `head-to-head' and `tail-to-tail' Bloch point configurations can, with the application of an external magnetic field, be switched between. Finally, by investigating the time evolution of the magnetisation field, we reveal the creation mechanism of the Bloch point. Our results introduce a stable and manipulable Bloch point to the collection of particle-like state candidates for the development of future spintronic devices.

8 pages, 4 figures

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Cited by in corpus (10)

• Using Jupyter for reproducible scientific workflows
• Ubermag: Towards more effective micromagnetic workflows
• Bloch points in nanostrips
• Fractional Skyrmion Tubes in Chiral-Interfaced Three-Dimensional Magnetic Nanowires
• Quantum and classical magnetic Bloch points
• Hyperbolic Bloch points in ferrimagnetic exchange spring
• Controlling stable Bloch points with electric currents
• X-ray holographic imaging of magnetic surface spirals in FeGe lamellae
• Regularized Micromagnetic Theory for Bloch Points
• Simulating Bloch points using micromagnetic and Heisenberg models