Publications

2025

(30) A metallic p-wave magnet with commensurate spin helix ,
R. Yamada, M. T. Birch, P. R. Baral, S. Okumura, R. Nakano, S. Gao, M. Ezawa, T. Nomoto, J. Masell, Y. Ishihara, K. K. Kolincio, I. Belopolski, H. Sagayama, H. Nakao, K. Ohishi, T. Ohhara, R. Kiyanagi, T. Nakajima, Y. Tokura, T.-h. Arima, Y. Motome, M. M. Hirschmann, M. Hirschberger,
Nature 646, 837-842 (2025) (arXiv preprint)

2024

(29) Role of magnetic anisotropy in the antiskyrmion-host schreibersite magnets,
M. Hemmida, J. Masell, K. Karube, D. Ehlers, H.-A. Krug von Nidda, V. Tsurkan, Y. Tokura, Y. Taguchi, and I. Kézsmárki,
Phys. Rev. B 110, 054416 (2024)

(28) Bloch Point Quadrupole Constituting Hybrid Topological Strings Revealed with Electron Holographic Vector Field Tomography,
F. S. Yasin, J. Masell, Y. Takahashi, T. Akashi, N. Baba, K. Karube, D. Shindo, T.-h. Arima, Y. Taguchi, Y. Tokura, T. Tanigaki, and X. Z. Yu,
Adv. Mater. 36 (16), 2311737 (2024) (arXiv preprint)

2023

(27) Heat current-driven topological spin texture transformations and helical q-vector switching,
F. S. Yasin, J. Masell, K. Karube, D. Shindo, Y. Taguchi, Y. Tokura, and X. Z. Yu,
Nat. Commun. 14, 7094 (2023) (open access)

(26) Helitronics as a potential building block for classical and unconventional computing,
N. T. Bechler and J. Masell,
Neuromorph. Comput. Eng. 3, 034003 (2023) (arXiv preprint)

(25) Kagome Lattice Promotes Chiral Spin Fluctuations,
K. K. Kolincio, M. Hirschberger, J. Masell, T.-h. Arima, N. Nagaosa, and Y. Tokura,
Phys. Rev. Lett. 130, 136701 (2023) (arXiv preprint)

2022

(24) Theory of charge and spin pumping in atomic-scale spiral magnets,
D. Kurebayashi, Y. Liu, J. Masell, and N. Nagaosa,
Phys. Rev. B 106, 205110 (2022) (arXiv preprint)

(23) Real-space determination of the isolated magnetic skyrmion deformation under electric current flow,
F. S. Yasin, J. Masell, K. Karube, A. Kikkawa, Y. Taguchi, Y. Tokura, and X. Z. Yu,
PNAS 119 (41), e2200958119 (2022)

(22) Doping Control of Magnetic Anisotropy for Stable Antiskyrmion Formation in Schreibersite (Fe,Ni)3P with S4 symmetry,
K. Karube, L. C. Peng, J. Masell, M. Hemmida, H.-A. Krug von Nidda, I. Kézsmárki, X. Z. Yu, Y. Tokura, and Y. Taguchi,
Adv. Mater. 34 (11), 2108770 (2022) (arXiv preprint)

(21) Detection of Topological Spin Textures via Non-Linear Magnetic Interactions,
M. Stepanova*, J. Masell*, E. Lysne*, P. Schoenherr, L. Köhler, M. Paulsen, A. Qaiumzadeh, N. Kanazawa, A. Rosch, Y. Tokura, A. Brataas, M. Garst, and D. Meier,
Nano Lett. 22, 1, 14-21 (2022) (open access)

2021

(20) Real-space observations of 60-nm skyrmion dynamics in an insulating magnet under low heat flow,
X. Z. Yu, F. Kagawa, S. Seki, M. Kubota, J. Masell, F. S. Yasin, K. Nakajima, M. Nakamura, M. Kawasaki, N. Nagaosa, and Y. Tokura,
Nature Commun. 12, 5079 (2021) (open access)

(19) Large Hall and Nernst responses from thermally induced spin chirality in a spin-trimer ferromagnet,
K. K. Kolincio, M. Hirschberger, J. Masell, S. Gao, A. Kikkawa, Y. Taguchi, T.-h. Arima, N. Nagaosa, and Y. Tokura,
PNAS 118 (33), e2023588118 (2021)

(18) Current-induced H-shaped-skyrmion creation and their dynamics in the helical phase,
R. Knapman, D. R. Rodrigues, J. Masell, and K. Everschor-Sitte,
J. Phys. D: Appl. Phys. 54, 404003 (2021) (arXiv preprint)

(17) Room-temperature antiskyrmions and sawtooth surface textures in a non-centrosymmetric magnet with S4 symmetry,
K. Karube, L. C. Peng, J. Masell, X. Z. Yu, F. Kagawa, Y. Tokura, and Y. Taguchi,
Nature Materials 20, 335-340 (2021) (arXiv preprint)

2020

(16) Combing the helical phase of chiral magnets with electric currents,
J. Masell, X. Z. Yu, N. Kanazawa, Y. Tokura, and N. Nagaosa,
Phys. Rev. B 102, 180402(R) (2020) (arXiv preprint)

(15) Real-Space Observation of Topological Defects in Extended Skyrmion-Strings,
X. Z. Yu*, J. Masell*, F. S. Yasin, K. Karube, N. Kanazawa, K. Nakajima, T. Nagai, K. Kimoto, W. Koshibae, Y. Taguchi, N. Nagaosa, and Y. Tokura,
Nano Lett. 20, 10, 7313-7320 (2020)

(14) Topological Nernst Effect of the Two-Dimensional Skyrmion Lattice,
M. Hirschberger, L. Spitz, T. Nomoto, T. Kurumaji, S. Gao, J. Masell, T. Nakajima, A. Kikkawa, Y. Yamasaki, H. Sagayama, H. Nakao, Y. Taguchi, R. Arita, T.-h. Arima, and Y. Tokura,
Phys. Rev. Lett. 125, 076602 (2020) (arXiv preprint)

(13) Spin-transfer torque driven motion, deformation, and instabilities of magnetic skyrmions at high currents,
J. Masell, D. R. Rodrigues, B. F. McKeever, and K. Everschor-Sitte,
Phys. Rev. B 101, 214428 (2020) (arXiv preprint)

2019

(12) Quantum Skyrmions in Frustrated Ferromagnets,
V. Lohani, C. Hickey, J. Masell, and A. Rosch,
Phys. Rev. X 9, 041063 (2019) (arXiv preprint)

(11) Universality of annihilation barriers of large magnetic skyrmions in chiral and frustrated magnets,
B. Heil, A. Rosch, and J. Masell,
Phys. Rev. B 100, 134424 (2019) (arXiv preprint)
featured in Kaleidoscope

2018

(10) Perspective: Magnetic skyrmions - Overview of recent progress in an active research field,
K. Everschor-Sitte, J. Masell, R. M. Reeve, and M. Kläui,
J. Appl. Phys. 124, 240901 (2018)

(9)   Reciprocal space tomography of 3D skyrmion lattice order in a chiral magnet,
S. Zhang, G. van der Laan, J. Müller, L. Heinen, M. Garst, A. Bauer, H. Berger, C. Pfleiderer, and T. Hesjedal,
PNAS 115 (25), 6386-6391 (2018)

(8)   Topological domain walls in helimagnets,
P. Schoenherr, J. Müller, L. Köhler, A. Rosch, N. Kanazawa, Y. Tokura, M. Garst, and D. Meier,
Nature Physics 14, 465-468 (2018) (arXiv preprint)

2017

(7)   Entropy-limited topological protection of skyrmions,
J. Wild, T.N.G. Meier, S. Pöllath, M. Kronseder, A. Bauer, A. Chacon, M. Halder, M. Schowalter, A. Rosenauer, J. Zweck, J. Müller, A. Rosch, C. Pfleiderer, and C. H. Back,
Science Advances 3(9), e1701704 (2017) (arXiv preprint)

(6)   Magnetic Skyrmions and Skyrmion Clusters in the Helical Phase of Cu2OSeO3,
J. Müller*, J. Rajeswari*, P. Huang*, Y. Murooka, H. M. Rønnow, F. Carbone, and A. Rosch,
Phys. Rev. Lett. 119, 137201 (2017) (arXiv preprint)

(5)   Motion of skyrmions in nanowires driven by magnonic momentum-transfer forces,
X. Zhang*, J. Müller*, J. Xia, M. Garst, X. Liu, and Y. Zhou,
New J. Phys. 19, 065001 (2017) (open access)

(4)   Magnetic skyrmions on a two-lane racetrack,
J. Müller,
New J. Phys. 19, 025002 (2017) (open access)

2016

(3)   Edge instabilities and skyrmion creation in magnetic layers,
J. Müller, A. Rosch, and M. Garst,
New J. Phys. 18, 065006 (2016) (open access)

2015

(2)   Capturing of a magnetic skyrmion with a hole,
J. Müller and A. Rosch,
Phys. Rev. B 91, 054410 (2015) (arXiv preprint)
featured in Kaleidoscope

2014

(5)   Observation of Thermal Current-Driven Spin Texture Dynamics in (Fe0.63Ni0.3Pd0.07)3P via Lorentz Transmission Electron Microscopy,
F. S. Yasin, J. Masell, K. Karube, D. Shindo, Y. Taguchi, Y. Tokura, and X. Z. Yu,
Microsc. Microanal. 30 (S1), ozae044.511 (2024)

(4)   Discovery of a Bloch Point Quadrupole Coupling Topological Skyrmions and Antiskyrmions into Hybrid Strings via Holographic Vector Field Electron Tomography,
F. S. Yasin, J. Masell, Y. Takahashi, T. Akashi, N. Baba, K. Karube, D. Shindo, T.-h. Arima, Y. Taguchi, Y. Tokura, T. Tanigaki, and X. Z. Yu,
Microsc. Microanal. 30 (S1), ozae044.500 (2024)

(3)   Room-temperature magnetic antiskyrmions and anisotropic fractal magnetic domain textures in (Fe,Ni,Pd)3P with S4 symmetry,
K. Karube, L. C. Peng, J. Masell, V. Ukleev, J. S. White, M. Hemmida, H.-A. Krug von Nidda, I. Kézsmárki, X. Z. Yu, F. Kagawa, Y. Tokura, and Y. Taguchi,
2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)

(2)   Real Space Demonstration of Electric Current-Induced Isolated Skyrmion Deformation,
F. S. Yasin, J. Masell, K. Karube, A. Kikkawa, Y. Taguchi, Y. Tokura, and X. Z. Yu,
Microsc. Microanal. 28(S1), 1724-1725 (2022)

PhD theses

Magnetic Skyrmions and Topological Domain Walls,
J. Müller, University of Cologne (2018)

Master theses

Theoretical investigation of magnetic order in Weyl semimetal GdAlSi,
M. Colling, KIT (11/2023)

Blowing Magnetic Hopfions,
P. Geßler, KIT (10/2023)

Driving Magnetic Skyrmions in Oscillating Magnetic Fields,
B. Große-Jüttermann, University of Cologne (11/2018)

The Stability of Skyrmions in Chiral Magnets & Frustrated Magnets,
B. Heil, University of Cologne (06/2018)

Skyrmions in Chiral Magnets: The Influence of Vacancies,
J. Müller, University of Cologne (06/2014)

Bachelor theses

The skyrmion fidget spinner,
L. Dierich, KIT (03/2024)

Helitronics for Unconventional Computing,
N. T. Bechler, KIT (04/2023)

Einfluss der Magnetfeldorientierung auf dünne Schichten chiraler Magnete,
C. Faber, University of Cologne (06/2016)