Topological Structures in Ferroic Materials

Seidel, Jan

doi:10.1007/978-3-319-25301-5

Cited by 69 publications

(11 citation statements)

References 11 publications

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“…Hence as field is increased, there is first an absorption of heat and then a release of heat. This is consistent with the expected entropic signature of first-order phase transitions into and out of the skyrmion lattice phase based on heap capacity measurements of low-temperature skyrmion hosts [14,17,19]. These peak and valley features form the extended ridges in (H,T ) space ( Fig.…”

supporting

confidence: 88%

“…In real materials, however these discontinuities are always smeared out by experimental convolution and inherent thermal/configurational disorder. This often renders mapping the bulk magnetic phase diagrams of skyrmion hosts a subtle endeavor, and discrepancies have arisen regarding the number of distinct topological phases that exist in key materials [12][13][14][15][16][17].…”

mentioning

confidence: 99%

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Magnetoentropic signatures of skyrmionic phase behavior in FeGe

et al. 2018

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We demonstrate that magnetocaloric measurements can rapidly reveal details of the phase diagrams of high temperature skyrmion hosts, concurrently yielding quantitative latent heats of the field-driven magnetic phase transitions. Our approach addresses an outstanding issue in the phase diagram of the skyrmion host FeGe by showing that DC magnetic anomalies can be explained in terms of entropic signatures consistent with a phase diagram containing a single pocket of skyrmionic order and a Brazovskii transition.

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confidence: 88%

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confidence: 99%

Magnetoentropic signatures of skyrmionic phase behavior in FeGe

et al. 2018

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“…m(r, τ ) = m(r, ξ(τ )). This enables one to proceed from the couple of the partial differential equations (2) to the set of the ordinary differential equations (ODE)…”

Section: Effective Mass In a Collective Variables Approachmentioning

confidence: 99%

Spin eigenmodes of magnetic skyrmions and the problem of the effective skyrmion mass

et al. 2018

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Properties of magnon modes localized on a ferromagnetic skyrmion are studied. Three types of possible asymptotic behavior of the modes eigenfrequencies are found for the case of large skyrmion radius Rs, namely ω0 ∼ R −2 s for the breathing mode, ω −|µ| ∼ R −1 s and ω |µ| ∼ R −3 s for modes with negative and positive azimuthal quantum numbers, respectively. A number of properties of the magnon eigenfunctions are determined. This enables us to demonstrate that the skyrmion dynamics based on the traveling wave model is described by the massless Thiele equation.

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“…5. Applying here the circular domain wall ansatz (4), we obtain the total energy (5). The condition for the existence of a local minimum in (5) gives expressions (6).…”

Section: (B13)mentioning

confidence: 99%

“…Chiral magnetic textures as domain walls, skyrmions and skyrmion bubbles are considered as promising building blocks for prospective memory and logic devices relying on spintronics and spino rbitronics concepts [1][2][3][4]. There is an intensive work on the controlled creation of these topologically non-trivial objects [4][5][6][7][8][9] but also on the manipulation of their static and dynamic properties [4,5,10,11]. Primarily, activities are dedicated to flat magnetic thin films with perpendicular magnetic anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Chiral Skyrmion and Skyrmionium States Engineered by the Gradient of Curvature

et al. 2018

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Curvilinear nanomagnets can support magnetic skyrmions stabilized at a local curvature without any intrinsic chiral interactions. Here, we propose a new mechanism to stabilize chiral Néel skyrmion states relying on the gradient of curvature. We illustrate our approach with an example of a magnetic thin film with perpendicular magnetic anisotropy shaped as a circular indentation. We show that in addition to the topologically trivial ground state, there are two skyrmion states with winding numbers ±1 and a skyrmionium state with a winding number 0. These chiral states are formed due to the pinning of a chiral magnetic domain wall at a bend of the nanoindentation due to spatial inhomogeneity of the curvature-induced Dzyaloshinskii-Moriya interaction. The latter emerges due to the gradient of the local curvature at a bend. While the chirality of the skyrmion is determined by the sign of the local curvature, its radius can be varied in a broad range by engineering the position of the bend with respect to the center of the nanoindentation. We propose a general method, which enables one to reduce a magnetic problem for any surface of revolution to the common planar problem by means of proper modification of constants of anisotropy and Dzyaloshinskii-Moriya

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Topological Structures in Ferroic Materials

Cited by 69 publications

References 11 publications

Magnetoentropic signatures of skyrmionic phase behavior in FeGe

Magnetoentropic signatures of skyrmionic phase behavior in FeGe

Spin eigenmodes of magnetic skyrmions and the problem of the effective skyrmion mass

Chiral Skyrmion and Skyrmionium States Engineered by the Gradient of Curvature

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