99 citations · 359 across the 21 of their papers we have counts for
23 papers
Stability and current-driven dynamics of mixed-topology bimeron clusters
Philippe Heymes, Thomas L. Schmidt, Vladyslav M. Kuchkin
In this work, we study bimerons (in-plane skyrmions) and their clusters composed of states with mixed topological indices. These clusters provide flexibility in controlling the sky…
Three-Dimensional Shankar Skyrmions in Frustrated Antiferromagnets
Vladyslav M. Kuchkin, Ricardo Rama-Eiroa, Carlos Saji +2
We formulate a continuum theory for three-dimensional (3D) Shankar skyrmions in frustrated chiral antiferromagnets (AFs) and derive the conditions for metastable finite-size $π_3(S…
Quantum Hopfion rings in the cluster mean-field approximation
Vladyslav M. Kuchkin, Thomas L. Schmidt
We study the quantum properties of two- and three-dimensional spin textures -- -skyrmions and hopfion rings -- within the cluster mean-field approximation (CMFA). By combining…
Magnetic skyrmion lattice disclinations in pentagon- and heptagon-shaped FeGe crystals
Thibaud Denneulin, Nikolai S. Kiselev, Vladyslav M. Kuchkin +1
Magnetic skyrmions in chiral magnets typically arrange into hexagonal lattices, with their structural order influenced by factors such as temperature, external magnetic fields and…
Regularized Micromagnetic Theory for Bloch Points
Vladyslav M. Kuchkin, Andreas Haller, Andreas Michels +2
Magnetic singularities known as Bloch points (BPs) present a fundamental challenge for micromagnetic theory, which is based on the assumption of a fixed magnetization vector length…
Spin-disorder-induced angular anisotropy in polarized magnetic neutron scattering
I. Titov, M. Bersweiler, M. P. Adams +14
We experimentally report a hitherto unseen angular anisotropy in the polarized small-angle neutron scattering (SANS) cross section of a magnetically strongly inhomogeneous material…
Linked skyrmions in shifted magnetic bilayer
Sumit Ghosh, Hiroshi Katsumoto, Gustav Bihlmayer +6
Magnetic solitons have recently attracted significant attention due to their intricate physical properties and potential applications in information processing. The majority of the…
Co-existing magnetization reversal mechanisms in shakti spin ice systems
Vladyslav M. Kuchkin, Unnar B. Arnalds, Hannes Jónsson +1
The switching mechanisms in artificial spin ice systems are investigated with focus on shakti and modified shakti lattices. Minimum energy paths are calculated using the geodesic n…
Skyrmionic Schrödinger cat states in monoaxial chiral magnets
Stefan Liscak, Andreas Haller, Andreas Michels +2
We study the low-energy excitation spectra of a spin-1/2 quantum Heisenberg model with a monoaxial Dzyaloshinskii-Moriya interaction. Using the density matrix renormalization group…
Stability and Nucleation of Dipole Strings in Uniaxial Chiral Magnets
Vladyslav M. Kuchkin, Nikolai S. Kiselev, Andreas Haller +3
We report on the stability of the magnetic dipole string (DS), a three-dimensional magnetic texture formed by two coupled Bloch points with opposite topological charges, separated…
Humanity's Last Exam
Long Phan, Alice Gatti, Ziwen Han +1168
Benchmarks are important tools for tracking the rapid advancements in large language model (LLM) capabilities. However, benchmarks are not keeping pace in difficulty: LLMs now achi…
Symmetry-Governed Dynamics of Magnetic Skyrmions Under Field Pulses
Vladyslav M. Kuchkin, Bruno Barton-Singer, Pavel F. Bessarab +1
Topological magnetic solitons, such as skyrmions, exhibit intriguing particle-like properties that make them attractive for fundamental research and practical applications. While m…
Quantum and classical magnetic Bloch points
Vladyslav M. Kuchkin, Andreas Haller, Štefan Liščák +5
A Bloch point represents a three-dimensional hedgehog singularity of a magnetic vector field in which the magnetization vanishes. However, standard micromagnetic theory, developed…
Skyrmions and antiskyrmions in monoaxial chiral magnets
Vladyslav M. Kuchkin, Nikolai S. Kiselev
We show that competition between local interactions in monoaxial chiral magnets provides the stability of two-dimensional (2D) solitons with identical energies but opposite topolog…
Heliknoton in a film of cubic chiral magnet
Vladyslav M. Kuchkin, Nikolai S. Kiselev, Filipp N. Rybakov +3
Cubic chiral magnets exhibit a remarkable diversity of two-dimensional topological magnetic textures, including skyrmions. However, the experimental confirmation of topological sta…
Tailed skyrmions -- an obscure branch of magnetic solitons
Vladyslav M. Kuchkin, Nikolai S. Kiselev, Pavel F. Bessarab
We report tailed skyrmions -- a new class of stable soliton solutions of the 2D chiral magnet model. Tailed skyrmions have elongated shapes and emerge in a narrow range of fields n…
Chiral standing spin waves in skyrmion lattice
Andrii S. Savchenko, Vladyslav M. Kuchkin, Filipp N. Rybakov +2
This work studies the resonance excitations of the three-dimensional skyrmions lattice in the finite thickness plate of an isotropic chiral magnet using spin dynamics simulations.…
Homotopy transitions and 3D magnetic solitons
Vladyslav M. Kuchkin, Nikolai S. Kiselev
This work provides a concept for three-dimensional magnetic solitons based on mapping the homotopy path between various two-dimensional solutions onto the third spatial axis. The r…
Magnetic particle-antiparticle creation and annihilation
Fengshan Zheng, Nikolai S. Kiselev, Luyan Yang +4
A fundamental property of particles and antiparticles, such as electrons and positrons, is their ability to annihilate one another. Similar behavior is predicted for magnetic solit…
Thermal generation of droplet soliton in chiral magnet
Vladyslav M. Kuchkin, Pavel F. Bessarab, Nikolai S. Kiselev
Controlled creation of localized magnetic textures beyond conventional -skyrmions is an important problem in the field of magnetism. Here by means of spin dynamics simulations,…
Geometry and Symmetry in Skyrmion Dynamics
Vladyslav M. Kuchkin, Ksenia Chichay, Bruno Barton-Singer +4
The uniform motion of chiral magnetic skyrmions induced by a spin-transfer torque displays an intricate dependence on the skyrmions' topological charge and shape. We reveal surpris…
Magnetic skyrmions, chiral kinks and holomorphic functions
Vladyslav M. Kuchkin, Bruno Barton-Singer, Filipp N. Rybakov +3
We present a novel approach to understanding the extraordinary diversity of magnetic skyrmion solutions. Our approach combines a new classification scheme with efficient analytical…
Turning chiral skyrmion inside out
Vladyslav M. Kuchkin, Nikolai S. Kiselev
The stability of two-dimensional chiral skyrmions in a tilted magnetic field is studied. It is shown that by changing the direction of the field and its magnitude, one can continuo…