Skyrmion lattice in a two-dimensional chiral magnet

Han, Jung Hoon; Zang, Jiadong; Yang, Zhihua; Park, Jin‐Hong; Nagaosa, Naoto

doi:10.1103/physrevb.82.094429

Cited by 183 publications

(190 citation statements)

References 22 publications

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“…Figure 3d shows that for fcc Pd stacking the exchange interaction favours the skyrmion over the ferromagnetic state (Eo0). This is in contradiction to the predictions from the micromagnetic model that assumes a ferromagnetic exchange stiffness [1][2][3][4]13,14,[21][22][23]32 . In Pd/Fe/Ir(111), however, we need to consider a ferromagnetic NN exchange that competes with antiferromagnetic interactions beyond the NNs.…”

Section: Resultscontrasting

confidence: 51%

Tailoring magnetic skyrmions in ultra-thin transition metal films

et al. 2014

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Skyrmions in magnetic materials offer attractive perspectives for future spintronic applications since they are topologically stabilized spin structures on the nanometre scale, which can be manipulated with electric current densities that are by orders of magnitude lower than those required for moving domain walls. So far, they were restricted to bulk magnets with a particular chiral crystal symmetry greatly limiting the number of available systems and the adjustability of their properties. Recently, it has been experimentally discovered that magnetic skyrmion phases can also occur in ultra-thin transition metal films at surfaces. Here we present an understanding of skyrmions in such systems based on first-principles electronic structure theory. We demonstrate that the properties of magnetic skyrmions at transition metal interfaces such as their diameter and their stability can be tuned by the structure and composition of the interface and that a description beyond a micromagnetic model is required in such systems.

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Section: Resultscontrasting

confidence: 51%

Tailoring magnetic skyrmions in ultra-thin transition metal films

et al. 2014

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“…We assume that the skyrmion configuration has the same form in plane as in 2D case and is independent of the third coordinate, z. Eq. (8) gives the skyrmion contribution to the classical energy δE = 4πCs 2 L, with L the system size in the third direction. The small-energy magnon spectrum is E = + C 3 q 2 z ; if we measure energy in units of 0 and q z in inverse interlayer distances then C 3 ∼ sJ ⊥ / 0 .…”

Section: Two-particle Interaction and Vertex Correctionsmentioning

confidence: 99%

“…This means that the BP skyrmion is a metastable solution, but is not unstable one because the spectrum of small fluctuations is non-negative. A number of theoretical works suggested various ways to lower the classical energy of the skyrmion state and thus make it energetically favorable [5][6][7][8][9] (see also 10 and references therein). This process of adding weaker interactions to the main Heisenberg Hamiltonian is called stabilization.…”

Section: Introductionmentioning

confidence: 99%

Stability of a skyrmion and interaction of magnons

Aristov

Matveeva

2016

Phys. Rev. B

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The stability of a single Belavin-Polyakov (BP) skyrmion in isotropic Heisenberg ferromagnet is studied. Such skyrmion is higher in energy than the uniform ferromagnetic state and is thus metastable. Starting from the lattice model in two spatial dimensions and using Maleyev-Dyson representation for spin operators, we examine the effects of magnon-magnon interaction for two quantities at T = 0. First we discuss the self-energy corrections to magnon energy. Second we analyze the two-particle Green's function and possible bound states of two magnons. The simplicity of the model makes possible full analytic treatment of all relevant processes. We found that the magnons remain well-defined quasiparticles with a finite lifetime. The bound states of two magnons are suppressed near the skyrmion, although they are not excluded far away from it. A resonance for the magnons of dilational mode in the vicinity of BP skyrmion is also found, which leads to a redistribution of the spectral weight. We conclude that the BP skyrmion as the classical topological object is not destroyed by quantum fluctuations.

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“…The skyrmion has been experimentally observed in various chiral magnets 21,22 as a result of the the competition between the Dzyaloshinskii-Moriya (DM) interactions, Heisenberg exchange, and Zeeman interaction [23][24][25] . It was first discovered in MnSi in a narrow window at finite temperatures 21 .…”

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confidence: 99%

Charged skyrmions on the surface of a topological insulator

et al. 2015

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We consider the interplay between magnetic skyrmions in an insulating thin film and the Dirac surface states of a 3D topological insulator (TI), coupled by proximity effect. The magnetic texture of skyrmions can lead to confinement of Dirac states at the skyrmion radius, where out of plane magnetization vanishes. This confinement can result in charging of the skyrmion texture. The presence of bound states is robust in an external magnetic field, which is needed to stabilize skyrmions. It is expected that for relevant experimental parameters skyrmions will have a few bound states that can be tuned using an external magnetic field. We argue that these charged skyrmions can be manipulated directly by an electric field, with skyrmion mobility proportional to the number of bound states at the skyrmion radius. Coupling skyrmionic thin films to a TI surface can provide a more direct and efficient way of controlling skyrmion motion in insulating materials. This provides a new dimension in the study of skyrmion manipulation.

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Skyrmion lattice in a two-dimensional chiral magnet

Cited by 183 publications

References 22 publications

Tailoring magnetic skyrmions in ultra-thin transition metal films

Tailoring magnetic skyrmions in ultra-thin transition metal films

Stability of a skyrmion and interaction of magnons

Charged skyrmions on the surface of a topological insulator

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