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Journal Article

Topological Hall signatures of magnetic hopfions


Göbel,  Börge
Max Planck Institute of Microstructure Physics, Max Planck Society;
International Max Planck Research School for Science and Technology of Nano-Systems, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Göbel, B., Akosa, C. A., Tatara, G., & Mertig, I. (2020). Topological Hall signatures of magnetic hopfions. Physical Review Research, 2(1): 013315. doi:10.1103/PhysRevResearch.2.013315.

Cite as: https://hdl.handle.net/21.11116/0000-0008-891B-0
Magnetic hopfions are topologically protected three-dimensional solitons that are constituted by a tube which exhibits a topologically nontrivial spin texture in the cross-section profile and is closed to a torus. Here we show that the hopfion's locally uncompensated emergent field leads to a topological Hall signature, although the topological Hall effect vanishes on the global level. The topological Hall signature is switchable by magnetic fields or electric currents and occurs independently of the anomalous and conventional Hall effects. It can therefore be exploited to electrically detect hopfions in experiments and even to distinguish them from other textures like skyrmion tubes. Furthermore, it can potentially be utilized in spintronic devices. Exemplarily, we propose a hopfion-based racetrack data storage device and simulate the electrical detection of the hopfions as carriers of information.