Theory of Monoaxial Chiral Helimagnet

Kishine, Jun‐ichiro; Овчинников, А. С.

doi:10.1016/bs.ssp.2015.05.001

Cited by 128 publications

(75 citation statements)

References 109 publications

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“…In the monoaxial helimagnet 6 , the competition between the ferromagnetic (FM) and DzyaloshinskiiMoriya 7,8 (DM) interactions at low T give rise to a spatially modulated chiral magnetic structure that, in absence of an applied field, has the form of an helix propagating with period L 0 along the chiral axis, which is called here the DM axis. At a certain ordering temperature, T 0 , a magnetic transition to a paramagnetic (PM) phase takes place.…”

Section: Introductionmentioning

confidence: 99%

“…The nature of the transition at T 0 is not fully understood and considerable effort is being devoted to clarify this interesting question [9][10][11][12][13][14][15] . At temperatures lower than T 0 , application of a magnetic field perpendicular to the DM axis deforms the helix and a chiral soliton lattice (CSL) appears 6,7,[16][17][18] . This CSL, which is realized 19 in CrNb 3 S 6 , supports phenomena very interesting for spintronics, like spin motive forces 20 and tuneable magnetoresistence 10,11,21,22 .…”

Section: Introductionmentioning

confidence: 99%

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Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields

2017

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The phase diagram of the monoaxial chiral helimagnet as a function of temperature (T ) and magnetic field with components perpendicular (Hx) and parallel (Hz) to the chiral axis is theoretically studied via the variational mean field approach in the continuum limit. A phase transition surface in the three dimensional thermodynamic space separates a chiral spatially modulated phase from a homogeneous forced ferromagnetic phase. The phase boundary is divided into three parts: two surfaces of second order transitions of instability and nucleation type, in De Gennes terminology, are separated by a surface of first order transitions. Two lines of tricritical points separate the first order surface from the second order surfaces. The divergence of the period of the modulated state on the nucleation transition surface has the logarithmic behavior typical of a chiral soliton lattice. The specific heat diverges on the nucleation surface as a power law with logarithmic corrections, while it shows a finite discontinuity on the other two surfaces. The soliton density curves are described by a universal function of Hx if the values of T and Hz determine a transition point lying on the nucleation surface; otherwise, they are not universal.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields

2017

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“…Among these topological spin-textures, a chiral magnetic soliton (CMS) has been predicted theoretically, the configuration of which is magnetic superlattice consisting of magnetic kinks with a ferromagnetic background [10,11,[18][19][20]. Experimentally, the CMS has been confirmed by the Lorentz microscopy and small-angle electron diffraction in the monoaxial helimagnetic CrNb 3 S 6 [9,21].…”

Section: Introductionmentioning

confidence: 99%

Critical phenomenon of the layered chiral helimagnetic YbNi₃Al₉

et al. 2020

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Two-dimensional layered YbNi 3 Al 9 exhibits a chiral helimagnetic ground state, which is a candidate for the field-modulated chiral magnetic soliton. In this work, the magnetism and critical phenomenon of YbNi 3 Al 9 are investigated. As H ⊥ c, a magnetic step with loop can be observed in the fielddependent magnetization, which may be corresponding to the possible chiral magnetic soliton phase transition. Based on the analysis of isothermal magnetization around T C , the critical exponents are obtained as β=0.1370(2), γ=1.7955(4), and δ=14.1043 (7), which fulfill the Widom scaling relation and Rushbrooke's law. Moreover, the obtained critical exponents are testified by the modified Arrott plot and scaling hypothesis. The critical exponents of YbNi 3 Al 9 are close to the theoretically prediction of 2D-Ising model with the spatial-dimensionality n=2 and spin-dimensionality d=1, indicating one-dimensional magnetic coupling in the two-dimensional framework. Based on universality scaling, we construct the detailed H-T phase diagram around the phase transition with H ⊥ c, which reveals that the field-induced magnetic transition for H ⊥ c is of the first-order type.

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“…When the magnetic field is applied, this system is a good playground for study of the two pictures mentioned above. Magnetic properties under the field have two regimes at zero temperature depending on the field direction 12,[29][30][31] . The magnetic field perpendicular to the helical axis induces a chiral soliton lattice, where higher order harmonics are introduced: In the particle picture, each soliton can be regarded as the 2π-domain wall of Bloch type, and its periodic array results in the soliton lattice.…”

Section: Introductionmentioning

confidence: 99%

“…The field parallel to the helical axis induces a chiral conical state described in the wave picture, and the instability-type CPT to the uniform state is described on the basis of the Landau theory of a helical order-parameter with uniform component parallel to the field 30,31 . It is important to understand how these two distinct CPTs can be connected by changing the field angle 36,37 .…”

Section: Introductionmentioning

confidence: 99%

Chiral solitons in monoaxial chiral magnets in tilted magnetic field

et al. 2018

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We thoroughly study the zero temperature properties of a monoaxial chiral spin system under the tilted magnetic field. The magnetic phase diagram includes two kinds of continuous phase transition and one discontinuous phase transition. We clarify the properties of the phase transition in terms of the helical wave picture and the particle (soliton) picture, and also in terms of the interaction between solitons. The interacting-soliton picture well describes most of the discontinuous phase transition. In addition, we investigate several instabilities of the modulated structures such as an isolated soliton and the surface modulation, since their instabilities should be important to the observable changes of the magnetic properties. For this purpose, we perform the energy landscape analyses as well as the excitation spectral analyses; The former approach gives an intuitive interpretation. We clarify the mechanisms of the instabilities through these analyses, and draw the stability lines of solitons in the magnetic phase diagram.

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Theory of Monoaxial Chiral Helimagnet

Cited by 128 publications

References 109 publications

Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields

Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields

Critical phenomenon of the layered chiral helimagnetic YbNi₃Al₉

Chiral solitons in monoaxial chiral magnets in tilted magnetic field

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Theory of Monoaxial Chiral Helimagnet

Cited by 128 publications

References 109 publications

Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields

Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields

Critical phenomenon of the layered chiral helimagnetic YbNi3Al9

Chiral solitons in monoaxial chiral magnets in tilted magnetic field

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Product

Resources

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Critical phenomenon of the layered chiral helimagnetic YbNi₃Al₉