Generic Aspects of Skyrmion Lattices in Chiral Magnets

Bauer, Andreas; Pfleiderer, C.

doi:10.1007/978-3-319-25301-5_1

Cited by 78 publications

(74 citation statements)

References 140 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beyond the determination of the phase diagram via dc susceptibility measurements, recently, several works have been devoted to analyzing the dynamic response of the modulated spin structures via ac susceptibility measurements. Similar features have been identified in the ac susceptibility in many compounds of the B20 family as well as in CuO 2 SeO 3 [34,[37][38][39][40][41]. Generally, the real component of the ac susceptibility follows well the static susceptibility, however in the vicinity of the magnetic phase boundaries, it deviates from the static value and becomes strongly frequency dependent, accompanied with a finite imaginary component of the susceptibility.…”

Section: Introductionsupporting

confidence: 70%

“…IV C. Therefore, the measured static susceptibility in the pure phases corresponds to the adiabatic values, as χ 0 = χ ∞ . Remarkably, the susceptibility is enhanced in the SkL phase as compared to the Cyc phase, in contrast to the B20 compounds, where the SkL phase is typically seen as a dip in the susceptibility of the embedding conical state [34]. In this longitudinal conical state, the magnetic field is roughly perpendicular to the rotation plane of the spins, while in the present case the magnetic field is applied within the spin rotation plane of the cycloids.…”

Section: A Magnetic Phase Diagram Established By Static and Ac Suscementioning

confidence: 56%

“…1 are not sharp but extend over relatively wide regions of magnetic fields. These regions are presumably characterized by the coexistence of the magnetic phases [34,37], as has been observed in various skyrmion host compounds in real space via magnetic force microscopy [46] and Lorentz-TEM imaging [4,6,10,47]. In the case of GaV 4 S 8 , the lamellar structure of the ferroelastic domains with a typical thickness in the micrometer range [27] may introduce significant disorder in the vicinity of domain boundaries and may also enhance demagnetizing fields in the sample.…”

Section: A Magnetic Phase Diagram Established By Static and Ac Suscementioning

confidence: 82%

“…The field-driven phase transitions are associated with anomalies in the static susceptibility [20,34]. The susceptibility measurements presented in Fig.…”

Section: A Magnetic Phase Diagram Established By Static and Ac Suscementioning

confidence: 94%

“…The measurement of static magnetization or magnetic susceptibility is a primary methodology to reveal the phase transitions between the modulated magnetic states in noncentrosymmetric magnets [9,20,[34][35][36]. Beyond the determination of the phase diagram via dc susceptibility measurements, recently, several works have been devoted to analyzing the dynamic response of the modulated spin structures via ac susceptibility measurements.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Relaxation dynamics of modulated magnetic phases in the skyrmion host GaV4S8 : An ac magnetic susceptibility study

et al. 2017

View full text Add to dashboard Cite

We report on the slow magnetization dynamics observed upon the magnetic phase transitions of GaV 4 S 8 , a multiferroic compound featuring a long-ranged cycloidal magnetic order and a Néel-type skyrmion lattice in a relatively broad temperature range below its Curie temperature. The fundamental difference between GaV 4 S 8 and the chiral helimagnets, the prototypical skyrmion host compounds, lies within the polar symmetry of GaV 4 S 8 , promoting a cycloidal instead of a helical magnetic order and rendering the magnetic phase diagram essentially different from that in the cubic helimagnets. Our ac magnetic susceptibility study reveals slow relaxation dynamics at the field-driven phase transitions between the cycloidal, skyrmion lattice and field-polarized states. At each phase boundary, the characteristic relaxation times were found to exhibit a strong temperature dependence, starting from the minute range at low temperatures, decreasing to the micro-to millisecond range at higher temperatures.

show abstract

Section: Introductionsupporting

confidence: 70%

Section: A Magnetic Phase Diagram Established By Static and Ac Suscementioning

confidence: 56%

Section: A Magnetic Phase Diagram Established By Static and Ac Suscementioning

confidence: 82%

“…The field-driven phase transitions are associated with anomalies in the static susceptibility [20,34]. The susceptibility measurements presented in Fig.…”

Section: A Magnetic Phase Diagram Established By Static and Ac Suscementioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Relaxation dynamics of modulated magnetic phases in the skyrmion host GaV4S8 : An ac magnetic susceptibility study

et al. 2017

View full text Add to dashboard Cite

show abstract

Noncentrosymmetric Magnets Hosting Magnetic Skyrmions

2017

View full text Add to dashboard Cite

with n = m/|m| being an unit vector parallel to the local magnetic moment m. [10,11] This means that the arrangement of spins within a single skyrmion can wrap a sphere nonzero integer times. The case of Φ = ± 1 is exemplified in Figure 1a, which suggests the topologically protected nature of the skyrmion spin texture.To stabilize such magnetic skyrmions, several different approaches have been proposed. For example, the interplay between the magnetic dipole-dipole interaction and uniaxial magnetic anisotropy often leads to the formation of a cylindrical magnetic domain structure termed magnetic bubble, [15][16][17][18] which is known to host various integer skyrmion numbers in cases depending on the detail of the internal spin texture. [19][20][21] The magnetic bubble was once utilized as the information carrier for magnetic storage devices (i.e., magnetic bubble memory), which was commercially available in the 1980s but later discontinued partly because the relatively large size of the magnetic bubble (≈1 μm) prevents further improvement of information density. Some latest studies suggest the possible miniaturization of bubble size down to sub-micron scale in multi-layered thin films with finely tuned magnetic parameters. [22,23] More recently, the experimental discovery of nanometric skyrmions has been reported for a series of ferromagnets with noncentrosymmetric crystal structure, where antisymmetric exchange interaction, i.e. Dzyaloshinskii-Moriya (DM) interaction, [24,25] originating from relativistic spin-orbit interaction plays a key role for the skyrmion formation. In this case, the size of skyrmion or the associated magnetic modulation period λ is determined by the ratio between the magnitudes of DM interaction D and ferromagnetic exchange interaction J in form of λ ∝ J/D, which typically ranges from 1 to 100 nm. The internal spin texture of magnetic skyrmions essentially depends on the symmetry of the underlying crystallographic lattice and associated DM interaction. [8,26] So far, most of the single-component materials showing magnetic skyrmions possess a chiral crystal structure, where Bloch-type skyrmions with a vortex-like swirling spin texture (Figure 1b) are observed. [10,12,[27][28][29][30] In contrast, under the uniaxial polar crystal structure, [31] the emergence of Néel type skyrmion with radial spin texture (Figure 1c) has been proposed. [8,26,32] Bloch (Néel) type skyrmions can form close-packed 2D hexagonal lattice (Figure 1f), which can be viewed as the superposition The concept of a skyrmion, which was first introduced by Tony Skyrme in the field of particle physics, has become widespread in condensed matter physics to describe various topological orders. Skyrmions in magnetic materials have recently received particular attention; they represent vortex-like spin structures with the character of nanometric particles and produce fascinating physical properties rooted in their topological nature. Here, a series of noncentrosymmetric ferromagnets hosting skyrmions is reviewed: B20 metals, Cu...

show abstract

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

Causer

Guasco

Paull

et al. 2023

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

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.

show abstract

Generic Aspects of Skyrmion Lattices in Chiral Magnets

Cited by 78 publications

References 140 publications

Relaxation dynamics of modulated magnetic phases in the skyrmion host GaV4S8 : An ac magnetic susceptibility study

Relaxation dynamics of modulated magnetic phases in the skyrmion host GaV4S8 : An ac magnetic susceptibility study

Noncentrosymmetric Magnets Hosting Magnetic Skyrmions

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

Contact Info

Product

Resources

About