Néel-type Skyrmion Lattice with Confined Orientation in the Polar Magnetic Semiconductor GaV$_4$S$_8$

Kézsmárki, I.; Bordács, S.; Milde, Peter; Neuber, Erik; Eng, Lukas M.; White, J. S.; Rønnow, H. M.; Dewhurst, C. D.; Mochizuki, Masahito; Yanai, Kouhei; Nakamura, Hakobu; Ehlers, D.; Tsurkan, V.; Loidl, A.

doi:10.48550/arxiv.1502.08049

Cited by 2 publications

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“…This was recently observed in the magnetic semiconductor GaV 4 S 8 . 25 In this material there are no Lifshitz invariants in the z-direction and a conical phase is therefore not present. Our results therefore also apply to this case, and, particularly when grown in thin-film form on different substrates, the magnetic anisotropy of this material may be tuned between easy axis and easy plane which enables experimentally exploring the full phase diagram in Fig.…”

Section: Introductionmentioning

confidence: 85%

Degeneracies and fluctuations of Néel skyrmions in confined geometries

et al. 2015

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The recent discovery of tunable Dzyaloshinskii-Moriya interactions in layered magnetic materials with perpendicular magnetic anisotropy makes them promising candidates for stabilization and manipulation of skyrmions at elevated temperatures. In this article, we use Monte Carlo simulations to investigate the robustness of skyrmions in these materials against thermal fluctuations and finite-size effects. We find that in confined geometries and at finite temperatures skyrmions are present in a large part of the phase diagram. Moreover, we find that the confined geometry favors the skyrmion over the spiral phase when compared to infinitely large systems. Upon tuning the magnetic field through the skyrmion phase, the system undergoes a cascade of transitions in the magnetic structure through states of different number of skyrmions, elongated and half-skyrmions, and spiral states. We consider how quantum and thermal fluctuations lift the degeneracies that occur at these transitions, and find that states with more skyrmions are typically favored by fluctuations over states with less skyrmions. Finally, we comment on electrical detection of the various phases through the topological and anomalous Hall effects.

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Section: Introductionmentioning

confidence: 85%

Degeneracies and fluctuations of Néel skyrmions in confined geometries

et al. 2015

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“…21,22,28 ), and skyrmion lattices with Néel-type modulations (Fig. 1 b) m = e ρ sin θ(ρ) + e z cos θ(ρ) (10) have been observed in Fe/Ir(111) and PdFe/Ir(111) nanolayers 25,29,30,35 and in the rhombohedral ferromagnet GaV 4 O 8 with C 3v symmetry 26 . The first direct observations of isolated skyrmions have been reported in PdFe/Ir(111) nanolayers 29 .…”

Section: The Equations For Axisymmetic Skyrmionsmentioning

confidence: 99%

“…In a broad range of applied magnetic fields and temperatures isolated skyrmions condense into hexagonal lattices 3,14,15 or other types of two-dimensional modulated states 16,17 . During the last years, intensive experimental efforts have been undertaken to find indications of hexagonal skyrmion lattices in different groups of chiral ferromagnets (see e.g [18][19][20][21][22][23][24][25][26][27] and bibliography in 15 ). Particularly, direct observations of skyrmion lat-tices have been reported in free standing nanolayers of cubic helimagnets in 21 (and the following papers of this group 22,28 ).…”

Section: Introductionmentioning

confidence: 99%

The properties of isolated chiral skyrmions in thin magnetic films

et al. 2016

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Axisymmetric solitonic states (chiral skyrmions) were first predicted theoretically more than two decades ago. However, until recently they have been observed in a form of skyrmionic condensates (hexagonal lattices and other mesophases). In this paper we report experimental and theoretical investigations of isolated chiral skyrmions discovered in PdFe/Ir(111) bilayers two years ago by Romming et al (2013 Science 341 636). The results of spin-polarized scanning tunneling microscopy analyzed within the continuum and discrete models provide a consistent description of isolated skyrmions in thin layers. The existence region of chiral skyrmions is restricted by strip-out instabilities at low fields and a collapse at high fields. We demonstrate that the same equations describe axisymmetric localized states in all condensed matter systems with broken mirror symmetry, and thus our findings establish basic properties of isolated skyrmions common for chiral liquid crystals, different classes of noncentrosymmetric magnets, ferroelectrics, and multiferroics.

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Néel-type Skyrmion Lattice with Confined Orientation in the Polar Magnetic Semiconductor GaV$_4$S$_8$

Cited by 2 publications

References 0 publications

Degeneracies and fluctuations of Néel skyrmions in confined geometries

Degeneracies and fluctuations of Néel skyrmions in confined geometries

The properties of isolated chiral skyrmions in thin magnetic films

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