Size and profile of skyrmions in skyrmion crystals

Wu, H. T.; Hu, X. C.; Jing, K. Y.; Wang, X. R.

doi:10.1038/s42005-021-00716-y

Cited by 36 publications

(40 citation statements)

References 46 publications

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“…Importantly, D 0sky strictly depends on the parameters of the microscopic Hamiltonian. In this respect, the determination of the skyrmion size for an isolated skyrmion by computing the skyrmion radius (both equilibrium and average) has recently been proved according to different analytical theories based on the minimization of the skyrmion energy with respect to the skyrmion radius [9,48,49]. In particular, it has been shown that both the average skyrmion size and the wall width separating the core from the outer domain of the skyrmion can be accurately computed [48].…”

Section: Negentropy and Landauer's Limit For A Magnetic Skyrmionmentioning

confidence: 99%

“…In particular, it has been shown that both the average skyrmion size and the wall width separating the core from the outer domain of the skyrmion can be accurately computed [48]. This investigation has been generalized by studying the magnetic skyrmion's size and spin profile in a condensed phase forming a skyrmion crystal at high skyrmion density [49]. In this latter case, it has been demonstrated that the dependence of skyrmion size on magnetic parameters is different compared to isolated skyrmions or to skyrmion stripes forming at low skyrmion density.…”

Section: Negentropy and Landauer's Limit For A Magnetic Skyrmionmentioning

confidence: 99%

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From Thermodynamics to Information: Landauer’s Limit and Negentropy Principle Applied to Magnetic Skyrmions

Zivieri¹

2022

Front. Phys.

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Magnetic skyrmions are topological swirling spin textures objects that can be manipulated and employed as information carriers. This is accomplished based either on their ground-state properties or their thermodynamic properties. Landauer’s principle establishes an irreversible conversion from information to physics. The inverse mechanism, the inverse mechanism is proposed for magnetic topological defects forming in magnetic nanostructures that are regarded as closed thermodynamic systems confirming Szilard’s and Brillouin’s hypotheses. This mechanism consists of the creation of bits of information using a thermodynamic source having a form of negentropy. In this perspective article, the following are proved for magnetic skyrmions: 1) Landauer’s principle expressed in terms of negentropy and 2) the generalized second principle of thermodynamics based on Brillouin’s negentropy principle of information. The thermodynamic entropy is converted into information entropy at the expense of negentropy, “negative entropy” corresponding to the loss of thermodynamic entropy from the magnetic skyrmion itself. A recently proposed practical device enables the verification of points 1) and 2) and allows a full understanding of the interchange between thermodynamics and information and vice versa regarding skyrmions as information units and showing, in perspective, the considerable advantages offered by this type of storing and coding information.

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Section: Negentropy and Landauer's Limit For A Magnetic Skyrmionmentioning

confidence: 99%

Section: Negentropy and Landauer's Limit For A Magnetic Skyrmionmentioning

confidence: 99%

From Thermodynamics to Information: Landauer’s Limit and Negentropy Principle Applied to Magnetic Skyrmions

Zivieri¹

2022

Front. Phys.

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“…With that being said, the exact demagnetization field is automatically included in all of our MUMAX3 simulations [39]. It is known that isolated circular skyrmions are metastable state when κ = π 2 D 2 /(16AK ) < 1 [38,40].…”

Section: Model and Methodsmentioning

confidence: 99%

“…In the polar coordinates (r,φ), the normalized magnetization is m = (sin cos , sin sin , cos ), where the polar angle of the magnetization of a skyrmion centered at r c can be well described by [38,40] (…”

Section: Model and Methodsmentioning

confidence: 99%

Skyrmion pinning by disk-shaped defects

et al. 2022

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“…Magnetic skyrmions [1][2][3][4][5] are topological magnetic solitons characterized by a topological number, which have drawn a lot of attention in spintronic applications due to their small size, topological stability, and low density of driving current. Generally, the presence of bulk, interfacial, or anisotropic Dzyaloshinskii-Moriya interactions (DMI) [6][7][8][9][10] stabilize magnetic skyrmions in chiral systems.…”

Section: Introductionmentioning

confidence: 99%

Spin-wave modes of magnetic bimerons in nanodots

Jin

et al. 2022

New J. Phys.

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We report the resonance excitations and the spin-wave modes of a single bimeron in a confined nanodot by using micromagnetic simulations. Magnetic bimerons can be considered as in-plane topological spin textures of magnetic skyrmions, which means that the spin-wave modes of bimerons also rotate in-plane compared to skyrmions, for example, through the application of out-of-plane microwave magnetic fields, the spin-wave mode of bimerons is no longer a breathing mode but contains a counterclockwise mode at low frequencies and a clockwise mode at high frequencies. When in-plane microwave magnetic fields rotated at different angles are applied, the spin-wave mode of bimerons has an anisotropic property, i.e., the spin-wave mode presents as a breathing mode for the microwave magnetic field applied along the x-direction, and a couple of azimuthal modes for the microwave magnetic field applied along the y-direction. Moreover, we demonstrate that the breathing mode, the counterclockwise rotation mode, and the clockwise rotation mode can simultaneously appear together when the microwave magnetic field is applied at a specific angle in the plane. In addition to the three typical spin-wave modes, two high-phase counterclockwise rotation modes lead to the periodic deformation of bimerons due to the broken rotational symmetry of the spin texture. Our results reveal the rich spin-wave modes of bimerons, which may contribute to the applications in spintronics and magnonics.

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Size and profile of skyrmions in skyrmion crystals

Cited by 36 publications

References 46 publications

From Thermodynamics to Information: Landauer’s Limit and Negentropy Principle Applied to Magnetic Skyrmions

From Thermodynamics to Information: Landauer’s Limit and Negentropy Principle Applied to Magnetic Skyrmions

Skyrmion pinning by disk-shaped defects

Spin-wave modes of magnetic bimerons in nanodots

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