Ross Knapman
Dr. Ross Knapman
|
Tel.: +49 201 183 3091 Room: V15 S06 D18 ross.knapman@uni-due.de |
Universität Duisburg-Essen Fakultät für IngenieurwissenschaftenAbteilung Bauwissenschaften Institut für Mechanik Universitätsstraße 15 Raum V15 S06 D18 45141 Essen |
|
ReserachGate
0000-0002-7915-5093 
Google Scholar Research
Focus
- Micromagnetic Modelling
- Magnetic Skyrmions
- Magnetic Materials
actual Projects
- Defect Detection in Magnetic Systems Using U-Net and Statistical Measures
- The Topological Fate of Magnetic Instabilities
- Predicting Magnetic Material Parameters from Latent Measures
- Magnetic Properties of NiMnSn Across Scales
- 3D Magnetic Textures with Mixed Topology: Unlocking the Tunable Hopf Index
past Projects
- Numerical Calculation of the Hopf Index for Three-Dimensional Magnetic Textures (2025)
- Spacetime Magnetic Hopfions from Internal Excitations and Braiding of Skyrmions (2024)
- Current-Induced H-Shaped-Skyrmion Creation and Their Dynamics in the Helical Phase (2021)
- Nonlinear Dynamics of Topological Ferromagnetic Textures for Frequency Multiplication (2021)
Teaching
Tutorials
- Electrodynamics (SS 23-24)
- Condensed Matter Physics (WS 20-21, JGU Mainz)
- Mathematical Calculation Methods (SS 20, JGU Mainz)
- Atomic and Quantum Physics (WS 19-20, JGU Mainz)
Career
| 2013 - 2015 | A-Levels, Paston College, United Kingdom |
| 2015 - 2019 | MPhys in Physics, Durham University, United Kingdom |
| 2019 - 2024 | PhD in Physics, Johannes Gutenberg-University Mainz, Germany |
| 08/2019 - 07/2022 | Research Associate, Institute of Physics, Johannes Gutenberg-University Mainz, Germany |
| 08/2022 - Present | Research Associate, Faculty of Physics, University Duisburg-Essen, Germany |
| 09/2025 - Present | Research Associate, Institute of Mechanics, University Duisburg-Essen, Germany |
Supervised thesis
- Bachelor „From Skyrmions to Hopfions“, Timon Tausendpfund, 2022, JGU Mainz
Publications
| Knapman, R., Majumdar, A., Bazazzadeh, N., Kalkan, K., Ollefs, K., Gutfleisch, O. & Everschor-Sitte, K. (2026), "Defect Detection in Magnetic Systems Using U-Net and Statistical Measures". |
BibTeX:
@misc{Knapman2026,
author = {Ross Knapman and Atreya Majumdar and Nasim Bazazzadeh and Kübra Kalkan and Katharina Ollefs and Oliver Gutfleisch and Karin Everschor-Sitte},
title = {Defect Detection in Magnetic Systems Using U-Net and Statistical Measures},
year = {2026},
url = {https://arxiv.org/abs/2603.07542}
}
|
| Knapman, R., Azhar, M., Pignedoli, A., Gallard, L., Hertel, R., Leliaert, J. & Everschor-Sitte, K. (2025), "Numerical calculation of the Hopf index for three-dimensional magnetic textures", Phys. Rev. B., Apr, 2025. Vol. 111, pp. 134408. American Physical Society. |
BibTeX:
@article{Knapman2025,
author = {Knapman, R. and Azhar, M. and Pignedoli, A. and Gallard, L. and Hertel, R. and Leliaert, J. and Everschor-Sitte, K.},
title = {Numerical calculation of the Hopf index for three-dimensional magnetic textures},
journal = {Phys. Rev. B},
publisher = {American Physical Society},
year = {2025},
volume = {111},
pages = {134408},
url = {https://link.aps.org/doi/10.1103/PhysRevB.111.134408},
doi = {https://doi.org/10.1103/PhysRevB.111.134408}
}
|
| Knapman, R.J. (2024), "Creation and manipulation of topological magnetic textures in chiral and frustrated magnets" |
BibTeX:
@article{Knapman2024a,
author = {Knapman, Ross John},
title = {Creation and manipulation of topological magnetic textures in chiral and frustrated magnets},
year = {2024}
}
|
| Azhar, M., Shaju, S.C., Knapman, R., Pignedoli, A. & Everschor-Sitte, K. (2024), "3D Magnetic Textures with Mixed Topology: Unlocking the Tunable Hopf Index". |
BibTeX:
@misc{Azhar2024,
author = {Maria Azhar and Sandra C. Shaju and Ross Knapman and Alessandro Pignedoli and Karin Everschor-Sitte},
title = {3D Magnetic Textures with Mixed Topology: Unlocking the Tunable Hopf Index},
year = {2024},
url = {https://arxiv.org/abs/2411.06929}
}
|
| Knapman, R., Tausendpfund, T., Díaz, S.A. & Everschor-Sitte, K. (2024), "Spacetime magnetic hopfions from internal excitations and braiding of skyrmions", Communications Physics., May, 2024. Vol. 7(1), pp. 151. |
| Abstract: Spatial topology endows topological solitons, such as skyrmions and hopfions, with fascinating dynamics. However, the temporal dimension has so far provided a passive stage on which topological solitons evolve. Here we construct spacetime magnetic hopfions: magnetic textures in two spatial dimensions that when excited by a time-periodic drive develop spacetime topology. We uncover two complementary construction routes using skyrmions by braiding their center of mass position and by controlling their internal low-energy excitations. Spacetime magnetic hopfions can be realized in nanopatterned grids to braid skyrmions and in frustrated magnets under an applied AC electric field. Their topological invariant, the spacetime Hopf index, can be tuned by the applied electric field as demonstrated by our collective coordinate modeling and micromagnetic simulations. The principles we have introduced to actively control spacetime topology are not limited to magnetic solitons, opening avenues to explore spacetime topology of general order parameters and fields. |
BibTeX:
@article{Knapman2024,
author = {Knapman, Ross and Tausendpfund, Timon and Díaz, Sebastián A. and Everschor-Sitte, Karin},
title = {Spacetime magnetic hopfions from internal excitations and braiding of skyrmions},
journal = {Communications Physics},
year = {2024},
volume = {7},
number = {1},
pages = {151},
url = {https://doi.org/10.1038/s42005-024-01628-3},
doi = {https://doi.org/10.1038/s42005-024-01628-3}
}
|
| Rodrigues, D.R., Nothhelfer, J., Mohseni, M., Knapman, R., Pirro, P. & Everschor-Sitte, K. (2021), "Nonlinear Dynamics of Topological Ferromagnetic Textures for Frequency Multiplication", Phys. Rev. Appl.., Jul, 2021. Vol. 16, pp. 014020. American Physical Society. |
BibTeX:
@article{Rodrigues2021,
author = {Rodrigues, D.R. and Nothhelfer, J. and Mohseni, M. and Knapman, R. and Pirro, P. and Everschor-Sitte, K.},
title = {Nonlinear Dynamics of Topological Ferromagnetic Textures for Frequency Multiplication},
journal = {Phys. Rev. Appl.},
publisher = {American Physical Society},
year = {2021},
volume = {16},
pages = {014020},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.16.014020},
doi = {https://doi.org/10.1103/PhysRevApplied.16.014020}
}
|
| Knapman, R., Rodrigues, D.R., Masell, J. & Everschor-Sitte, K. (2021), "Current-induced H-shaped-skyrmion creation and their dynamics in the helical phase", Journal of Physics D: Applied Physics., jul, 2021. Vol. 54(40), pp. 404003. IOP Publishing. |
| Abstract: Inevitable for the basic principles of skyrmion racetrack-like applications is not only their confined motion along one-dimensional channels but also their controlled creation and annihilation. Helical magnets have been suggested to naturally confine the motion of skyrmions along the tracks formed by the helices, which also allow for high-speed skyrmion motion. We propose a protocol to create topological magnetic structures in a helical background. We furthermore analyse the stability and current-driven motion of the skyrmions in a helical background with in-plane uniaxial anisotropy fixing the orientation of the helices. |
BibTeX:
@article{Knapman2021,
author = {Knapman, R and Rodrigues, D R and Masell, J and Everschor-Sitte, K},
title = {Current-induced H-shaped-skyrmion creation and their dynamics in the helical phase},
journal = {Journal of Physics D: Applied Physics},
publisher = {IOP Publishing},
year = {2021},
volume = {54},
number = {40},
pages = {404003},
url = {https://doi.org/10.1088/1361-6463/ac0e5a},
doi = {https://doi.org/10.1088/1361-6463/ac0e5a}
}
|
Stand: 09.07.2026