Chiral criticality in the doped helimagnets Mn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Si

Grigoriev, S. V.; Moskvin, E. V.; Dyadkin, Vadim; Lamago, D.; Wolf, Thomas; Eckerlebe, H.; Maleyev, S. V.

doi:10.1103/physrevb.83.224411

Cited by 80 publications

(123 citation statements)

References 12 publications

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“…Above H c1 a longitudinal cone is formed with the cone opening angle closing at H c2 where the field-polarized state is reached. These phases have been found in FeGe [1], MnSi [2] and in pseudo binary systems Fe 1−x Co x Si [4,5,6], Mn 1−y Co y Si [5,8], and Mn 1−z Fe z Si [8,9]. The A region found in FeGe is to some extend peculiar as it shows subtleties not observed for other cubic helimagets.…”

Section: Resultsmentioning

confidence: 84%

“…The sense of the magnetization rotation is fixed due to the presence of the chiral DzyaloshinskiiMoriya (DM) interaction [20,21]. However, in their magnetic field−temperature, (H, T ), phase diagrams, as sketched in figure 1(a), numerous puzzling physical anomalies have been observed in a narrow temperature interval in the vicinity of T C [8,10,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42]. The origin of these "precursor anomalies" (hatched area in figure 1(a)) and notably the magnetic structure of the so-called A phase is a long-standing and intriguing problem in chiral magnetism.…”

Section: Introductionmentioning

confidence: 99%

“…The prediction of a possible formation of such magnetic vortices in non-centrosymmetric ferromagnets in general [43,44] and in cubic helimagnets in particular [45,46,47] have triggered an intensive quest for these exotic states [7,10,32,33,34,37,38,39,40,41,42,48,49]. Of particular interest in the experimental investigations is the A phase, a small area below T C reported for MnSi many years ago [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…Cubic iron monogermanide, FeGe, [1] together with the iso-structural MnSi [2] and MnGe [3] as well as the pseudo-binary compounds Fe 1−x Co x Si (0.1 ≤ x ≤ 0.7) [4,5,6,7], Mn 1−y Co y Si (0 ≤ y < 0.9) [5,8], and Mn 1−z Fe z Si (0 ≤ z < 0.13) [8,9] are non-centrosymmetric cubic helimagnets (space group P 2 1 3, B20-type structure) Table 1. Curie temperature T C , spontaneous magnetic moment µs(T → 0), lattice parameter a, helix period L D , and saturation field H D ≡ H c2 (T = 0) for some cubic helimagnets with B 20-type structure (space group P 2 1 3).…”

Section: Introductionmentioning

confidence: 99%

“…278.2 [10] 1 [11] 4.700 [12] 700 [1] 0.359 [13] MnSi 29.5 [14] 0.4 [14] 4.559 [15] 180 [2] 0.62 [16] MnGe (a) 170 [3] 1.7 [3] 4.795 [17] 30 [3] 12 [3] Mn 0.9 Fe 0.1 Si 6.8 [18] 0.17 (b) 4.5529 100 [9] 0.645 [9] Fe 0.65 Co 0. 35 Si 58.8 [4] 0.218 [4] 4.471 [19] 471 [5] 0.145 [4] (a) orders antiferromagnetically; (b) interpolated value using data in Ref [8].…”

Section: Introductionmentioning

confidence: 99%

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Confinement of chiral magnetic modulations in the precursor region of FeGe

Wilhelm

Baenitz

Schmidt

et al. 2012

J. Phys.: Condens. Matter

111

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Abstract. We report on magnetic susceptibility and specific heat measurements of the cubic helimagnet FeGe in external magnetic fields and temperatures near the onset of long-range magnetic order at T C = 278.2(3) K. Pronounced anomalies in the field-dependent χac(H) data as well as in the corresponding imaginary part χ ac (H) reveal a precursor region around T C in the magnetic phase diagram. The occurrence of a maximum at T 0 = 279.6 K in the zero-field specific heat data indicates a second order transition into a magnetically ordered state. A shoulder evolves above this maximum as a magnetic field is applied. The field dependence of both features coincides with crossover lines from the field-polarized to the paramagnetic state deduced from χac(T ) at constant magnetic fields. The experimental findings are analyzed within the standard Dzyaloshinskii theory for cubic helimagnets. The remarkable multiplicity of modulated precursor states and the complexity of the magnetic phase diagram near the magnetic ordering are explained by the change of the character of solitonic inter-core interactions and the onset of specific confined chiral modulations in this area.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Confinement of chiral magnetic modulations in the precursor region of FeGe

Wilhelm

Baenitz

Schmidt

et al. 2012

J. Phys.: Condens. Matter

111

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show abstract

Noncentrosymmetric Magnets Hosting Magnetic Skyrmions

2017

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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...

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Investigation of chiral phases near helical ordering temperature in MnSi

Samatham

Ganesan

2015

Phys. Status Solidi B

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Chiral modulation crossovers and phase transitions of MnSi in the vicinity of the long‐range magnetic ordering temperature are investigated. Notable anomalies in specific heat as a function of magnetic fields that directly correspond to the speculated chiral modulations in the precursor region are observed. The magneto‐thermal (H–T) phase diagram reveals the existence of repulsive, attractive, and confined skyrmion phases. Resistivity analysis suggests strong electron–magnon coupling as well as the possibility of strong electron correlations in MnSi supported by the Kadowaki–Woods ratio (A/γ2), which is close to that of moderate heavy Fermion metals.

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Chiral criticality in the doped helimagnets Mn1−yFeySi

Cited by 80 publications

References 12 publications

Confinement of chiral magnetic modulations in the precursor region of FeGe

Confinement of chiral magnetic modulations in the precursor region of FeGe

Noncentrosymmetric Magnets Hosting Magnetic Skyrmions

Investigation of chiral phases near helical ordering temperature in MnSi

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