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Topological spin structures such as magnetic skyrmions are of fundamental interest and promising for various types of applications in spintronics. Skyrmions have been predicted to emerge also in antiferromagnetic materials where they…

Particle-like topological magnetic defects that can propagate in all spatial directions open a new dimension for design of magnetic memory and data processing devices. We show that three-dimensional magnetic skyrmions can be stabilized in…

Strongly Correlated Electrons · Physics 2022-01-04 Evgenii Barts , Maxim V. Mostovoy

Magnetic hopfion is three-dimensional (3D) topological soliton with novel spin structure that would enable exotic dynamics. Here we study the current driven 3D dynamics of a magnetic hopfion with unit Hopf index in a frustrated magnet.…

Mesoscale and Nanoscale Physics · Physics 2020-04-01 Yizhou Liu , Wentao Hou , Xiufeng Han , Jiadong Zang

Optical skyrmions have recently been constructed by tailoring electric or spin field distributions through the interference of multiple surface plasmon polaritons, offering promising features for advanced information processing, transport…

Optics · Physics 2022-01-11 Zi-Lan Deng , Tan Shi , Alex Krasnok , Xiangping Li , Andrea Alù

Magnetic hopfions are string-like three-dimensional topological solitons, characterised by the Hopf invariant. They serve as a fundamental prototype for three-dimensional magnetic quasi-particles and are an inspiration for novel device…

Mesoscale and Nanoscale Physics · Physics 2023-03-15 Moritz Sallermann , Hannes Jónsson , Stefan Blügel

Hopfions, as three-dimensional topologically nontrivial structures described by poloidal and toroidal winding numbers, hold promise as robust information carriers in spintronics, functional materials, and optical communications. Although…

Magnetic hopfions in chiral magnets are topological solitons, localized in three dimensions. But is their localization strong? To address this question we derive an asymptotic expansion for the isolated hopfion's spatial profile. It becomes…

Mesoscale and Nanoscale Physics · Physics 2026-02-25 Konstantin L. Metlov , Maksim M. Gordei

Magnetic skyrmions are topological magnetic spin structures exhibiting particle-like behaviour. They are of strong interest from a fundamental viewpoint and for application, where they have potential to act as information carriers in future…

Magnetic skyrmions are stable topological solitons with complex non-coplanar spin structures. Their nanoscopic size and the low electric currents required to initiate and control their motion has opened a new field of research, skyrmionics,…

Three-dimensional (3D) topological states resemble truly localised, particle-like objects in physical space. Among the richest such structures are 3D skyrmions and hopfions that realise integer topological numbers in their configuration via…

Topologically secure spin configurations, such as skyrmions and bimerons, offer a compelling alternative to conventional magnetic domains, potentially enabling high-density, low-power spintronic devices. These pseudo-particles,…

Mesoscale and Nanoscale Physics · Physics 2025-11-14 Martín Latorre , Joaquín Barra , Juan Pablo Vera , Joaquín Martinez , Mario Castro , Sebastián Allende , Alvaro S. Nunez

We provide a derivation of a spin Skyrmion number classification for two-dimensional topological superconductors constructed from ferromagnetic and Rashba spin-orbit coupled semiconductor-superconductor heterostructures. We show that in the…

Superconductivity · Physics 2014-04-25 Kristofer Björnson , Annica M. Black-Schaffer

Nanoscale topologically non-trivial magnetization configurations generate significant interest due to both the fundamental properties of their knotted structures and their potential applications in ultra-efficient computing devices. While…

Resonant spin dynamics of topological spin textures are correlated with their topological nature, which can be employed to understand this nature. In this study, we present resonant spin dynamics of three-dimensional topological spin…

Mesoscale and Nanoscale Physics · Physics 2022-04-13 Zulfidin Khodzhaev , Emrah Turgut

Magnetic hopfions are three-dimensional localized topological solitons in the volume of a magnet. In this work, starting with a classical free energy density of a helimagnet, an approximate variational model of hopfions is studied. The…

Mesoscale and Nanoscale Physics · Physics 2024-09-10 Konstantin L. Metlov

Hopfions--three-dimensional topological solitons with knotted spin texture--have recently garnered attention in topological magnetism due to their unique topology characterized by the Hopf number $H$, a topological invariant derived from…

Mesoscale and Nanoscale Physics · Physics 2025-12-01 Shoya Kasai , Shun Okumura , Yukitoshi Motome

Magnetic skyrmions are topologically protected chiral spin textures which present opportunities for next-generation magnetic data storage and logic information technologies. The topology of these structures originates in the geometric…

Localized magnetic topological solitons with Hopf index of 1 in an unbounded bulk magnet are studied theoretically, starting with the classical micromagnetic Hamiltonian. It is shown analytically that (like Bloch and N\'eel walls in…

Mesoscale and Nanoscale Physics · Physics 2023-05-30 Konstantin L. Metlov

Three-dimensional (3D) magnetic textures attract great attention from researchers due to their fascinating structures and dynamic behaviors. Magnetic hopfion is a prominent example of 3D magnetic textures. Here, we numerically study the…

Mesoscale and Nanoscale Physics · Physics 2022-05-23 Shuang Li , Jing Xia , Laichuan Shen , Xichao Zhang , Motohiko Ezawa , Yan Zhou

Magnetic skyrmion is a topologically stable particle-like swirling spin texture potentially suitable for high-density information bit, which was first observed in noncentrosymmetric magnets with Dzyaloshinskii-Moriya interaction. Recently,…

Materials Science · Physics 2022-02-01 N. D. Khanh , T. Nakajima , S. Hayami , S. Gao , Y. Yamasaki , H. Sagayama , H. Nakao , R. Takagi , Y. Motome , Y. Tokura , T. Arima , S. Seki