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Phase-field simulation of superconductor vortex clustering in the vicinity of ferromagnetic domain bifurcations |
| Hasnain Mehdi Jafri1,2, Jing Wang(王静)1,2,†, Chao Yang(杨超)1,2, Jun-Sheng Wang(王俊升)1,2, and Hou-Bing Huang(黄厚兵)1,2 |
| 1 School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China; 2 Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China |
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Abstract Superconductors and ferromagnets are highly non-compatible materials due to the natures of their respective electronic states. But when artificially brought together, they develop interesting characteristics, one of which, vortex clustering, is discussed here in this paper. Phase-field and micromagnetic simulations are performed to investigate the superconductor and ferromagnet bilayer, respectively. The ferromagnet with uniaxial anisotropy is observed to develop the maze domain, whereas the superconductor subjected to the influence of the ferromagnetic stray field displays a vortex pattern. Clustered vortices in superconductors at certain locations are observed to be precisely located over magnetic domain bifurcations. The enhanced out-of-plane stray field at bifurcations around the curved domain walls and the convergent Lorentz force due to screening currents in superconductor are attributed to the formation of clusters at bifurcation sites. Segregation of the inter-vortex spacing between straight and bifurcated domain is clearly observed. More importantly, inter-vortex spacing is predicted to serve as a precise tool to map local ferromagnet domain shapes.
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Received: 30 May 2020
Revised: 18 July 2020
Accepted manuscript online: 25 August 2020
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PACS:
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74.20.De
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(Phenomenological theories (two-fluid, Ginzburg-Landau, etc.))
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74.25.Wx
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(Vortex pinning (includes mechanisms and flux creep))
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74.25.Uv
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(Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses))
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74.78.Fk
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(Multilayers, superlattices, heterostructures)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51972028 and 12004036) and the National Key Research and Development Program of China (Grant No. 2019YFA0307900). |
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Corresponding Authors:
†Corresponding author. E-mail: jwang@bit.edu.cn
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Cite this article:
Hasnain Mehdi Jafri, Jing Wang(王静), Chao Yang(杨超), Jun-Sheng Wang(王俊升), and Hou-Bing Huang(黄厚兵) Phase-field simulation of superconductor vortex clustering in the vicinity of ferromagnetic domain bifurcations 2020 Chin. Phys. B 29 127402
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