Field-driven metamorphoses of isolated skyrmions within the conical state of cubic helimagnets

Leonov, A. O.; Pappas, C.; Smalyukh, Ivan I.

doi:10.1103/physrevb.104.064432

Cited by 30 publications

(16 citation statements)

References 84 publications

(104 reference statements)

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“…The distinct energy pattern of an isolated bimeron ( Figure 2 d) implies bimeron chain formation rather than closely packed bimeron clusters with, e.g., hexagonal ordering, as would be the case for ordinary Skyrmions [ 54 ]. A bimeron chain runs along the in-plane (or canted) magnetization component of the TFM phase.…”

Section: Bimeron “Macromolecules”mentioning

confidence: 99%

“Polymerization” of Bimerons in Quasi-Two-Dimensional Chiral Magnets with Easy-Plane Anisotropy

Mukai,

Leonov

2024

Nanomaterials

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We re-examine the internal structure of bimerons, which are stabilized in easy-plane chiral magnets and represent coupled states of two merons with the same topological charge |1/2| but with opposite vorticity and the polarity. We find that, in addition to the vortices and antivortices, bimerons feature circular regions which are located behind the anti-vortices and bear the rotational sense opposite to the rotational sense chosen by the Dzyaloshinskii–Moriya interaction. In an attempt to eliminate these wrong-twist regions with an excess of positive energy density, bimerons assemble into chains, and as such exhibit an attracting interaction potential. As an alternative to chains, we demonstrate the existence of ring-shaped bimeron clusters of several varieties. In some rings, bimeron dipoles are oriented along the circle and swirl clockwise and/or counterclockwise (dubbed “roundabouts”). Moreover, a central meron encircled by the outer bimerons may possess either positive or negative polarity. In other rings, the bimeron dipoles point towards the center of a ring and consequently couple to the central meron (dubbed “crossings”). We point out that the ringlike solutions for baryons obtained within the Skyrme model of pions, although driven by the same tendency of the energy reduction, yield only one type of bimeron rings. The conditions of stability applied to the described bimeron rings are additionally extended to bimeron networks when bimerons fill the whole space of two-dimensional samples and exhibit combinations of rings and chains dispersed with different spatial density (dubbed bimeron “polymers”). In particular, bimeron crystals with hexagonal and the square bimeron orderings are possible when the sides of the unit cells represent chains of bimerons joined in intersections with three or four bimerons, respectively; otherwise, bimeron networks represent disordered bimeron structures. Moreover, we scrutinize the inter-transformations between hexagonal Skyrmion lattices and disordered bimeron polymers occuring via nucleation and mutual annihilation of merons within the cell boundaries. Our theory provides clear directions for experimental studies of bimeron orderings in different condensed-matter systems with quasi-two-dimensional geometries.

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Section: Bimeron “Macromolecules”mentioning

confidence: 99%

“Polymerization” of Bimerons in Quasi-Two-Dimensional Chiral Magnets with Easy-Plane Anisotropy

Mukai,

Leonov

2024

Nanomaterials

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“…The twisting occurs as a consequence of the chiral crystal structure which lacks inversion symmetry enforcing the antisymmetric Dzyaloshinskii-Moriya interaction, resulting in long-period helical spin modulations. In the presence of external magnetic fields, the helimagnetic state, depending on the crystalline structure and anisotropy, can transform into a range of nontrivial magnetic states, comprising most commonly of the conical state, [126] tilted conical state, [127] the 1D soliton lattice state, [128] as well as the 2D topological skyrmion lattice state. [129] Within the family of bulk chiral magnets, the most extensively studied has been that of MnSi, as this was the first compound identified experimentally to host topological skyrmions in applied fields near the helimagnetic to paramagnetic transition.…”

Section: Chiral Spin Systemsmentioning

confidence: 99%

Topical Review of Quantum Materials and Heterostructures Studied by Polarized Neutron Reflectometry

Causer

Guasco

Paull

et al. 2023

Physica Rapid Research Ltrs

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A review of the applications of polarized neutron reflectometry (PNR) for the investigation of quantum materials is provided. Recent studies of superconductors, strongly correlated oxides, hydrogen‐induced modifications, topological insulators and chiral magnets are highlighted. The PNR technique uses a quantum beam of spin‐polarized neutrons to measure the nanomagnetic structure of thin films and heterostructures, with a sensitivity to magnetization at the scale of 10–2000 emu cm−3 and a vertical spatial resolution of 1–500 nm. From simple beginnings studying the magnetic flux penetration at superconducting surfaces, today the PNR technique is widely used for investigating many different types of thin film structures, surfaces, interfaces, and 2D materials. PNR measurements can reveal a number of details about magnetic, electronic, and superconducting properties, in tandem with chemical information including the stoichiometry of light elements such as oxygen and hydrogen.

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“…5.(c)]. Another way to understand bimerons is as an intermediate step, as the one-dimensional stripes of the helical phase decompose into an array of skyrmions, stabilised by thermal fluctuations [27,34].…”

Section: (C)] and Helical (H) Phasesmentioning

confidence: 99%

Skyrmion fluid and bimeron glass protected by a chiral spin liquid on a kagome lattice

Rosales¹,

Albarracín²,

Pujol³

et al. 2022

Preprint

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Skyrmions are of interest both from a fundamental and technological point of view, due to their potential to act as information carriers. One great challenge concerns their manipulation and control, especially at higher temperatures. Here we combine skyrmion physics with another aspects of modern condensed matter: spin liquids. Using the high entropy and broken symmetry of a chiral spin liquid, we design a theoretical model to control the density of well defined skyrmions with temperature, all the way from a diluted gas to a dense liquid and a crystallised solid. At high field, the skyrmion fluid forms an original bimeron glass with high degeneracy and out-of-equilibrium dynamics, reminiscent of co-polymer physics and chain models in statistical mechanics. Our approach illustrates how spin-liquid properties can be used for the design of tailored models, and further connects skyrmions to phenomena beyond condensed matter.

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Field-driven metamorphoses of isolated skyrmions within the conical state of cubic helimagnets

Abstract: Field-driven metamorphoses of isolated skyrmions within the conical state of cubic helimagnets

Cited by 30 publications

References 84 publications

“Polymerization” of Bimerons in Quasi-Two-Dimensional Chiral Magnets with Easy-Plane Anisotropy

“Polymerization” of Bimerons in Quasi-Two-Dimensional Chiral Magnets with Easy-Plane Anisotropy

Topical Review of Quantum Materials and Heterostructures Studied by Polarized Neutron Reflectometry

Skyrmion fluid and bimeron glass protected by a chiral spin liquid on a kagome lattice

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