Spiral plane flops in frustrated helimagnets in external magnetic field

Utesov, Oleg I.; Syromyatnikov, A. V.

doi:10.1103/physrevb.98.184406

Cited by 9 publications

(12 citation statements)

References 32 publications

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“…The opposite case of D − E < α and E < α is considered in detail in Ref. 11 , where the spiral plane flop was observed upon the field increasing (i.e., the transition shown in Fig. 1(b)).…”

Section: A Antiferromagnets With Single-ion Biaxial Anisotropymentioning

confidence: 96%

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Formation of spiral ordering by magnetic field in frustrated anisotropic antiferromagnets

Utesov

Syromyatnikov

2019

Phys. Rev. B

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We discuss theoretically phase transitions in frustrated antiferromagnets with biaxial anisotropy or dipolar forces in magnetic field applied along the easy axis at T = 0. There are well-known sequences of phase transitions upon the field increasing: the conventional spin-flop transition and the flop of the spiral plane at strong and weak easy-axis anisotropy, respectively. We argue that much less studied scenarios can appear at moderate anisotropy in which the magnetic field induces transitions of the first order from the collinear state to phases with spiral orderings. Critical fields of these transitions are derived in the mean-field approximation and the necessary conditions are found for the realization of these scenarios. We show that one of the considered sequences of phase transitions was found in multiferroic MnWO4 both experimentally and numerically (in a relevant model) and our theory reproduces quantitatively the numerical findings.

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Section: A Antiferromagnets With Single-ion Biaxial Anisotropymentioning

confidence: 96%

“…YZ↔XY transition is of the spiral plane flop type which is described in detail in Ref. 11 and which arises at h = h sp , where…”

Section: A Antiferromagnets With Single-ion Biaxial Anisotropymentioning

confidence: 99%

Formation of spiral ordering by magnetic field in frustrated anisotropic antiferromagnets

Utesov

Syromyatnikov

2019

Phys. Rev. B

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“…As it was shown in Ref. 18 , at large enough magnetic fields, the conical phase is the ground state of the system with the spiral plane being perpendicular to the field direction. However a competition between the helical and the commensurate phases can appear at moderate anisotropy.…”

Section: Modelmentioning

confidence: 51%

“…We report also the absence of the symmetry q ↔ −q at finite field in both linear terms (17), where −2k and 2k momenta are not equivalent, and in the bilinear part of the Hamiltonian (18), where coefficient C q is not symmetric due to the term ∝ N q,k (see also Ref. 22 ).…”

Section: Conical Phasementioning

confidence: 69%

Phase competition in frustrated anisotropic antiferromagnet in strong magnetic field

Utesov,

Syromyatnikov

2020

Preprint

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We discuss theoretically a frustrated Heisenberg antiferromagnet in magnetic field close to the saturation one. It is demonstrated that a small biaxial anisotropy and/or the magnetic dipolar interaction produce a delicate balance between phases with a commensurate canted, incommensurate helical (conical), and fan spin orderings. As a result, different sequences of phase transitions are realized depending on values of these small anisotropic interactions. We derive analytical expressions for critical fields and ground-state energies of the phases which are in a quantitative agreement with our and previous Monte-Carlo simulations.

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“…This, along with other effects, leads to spiral plane flop (transition 1Q↔XY, which is well-known for frustrated antiferromagnets with dipolar interaction, see Ref. 34 ) at certain h SF for which Λ = Λ . One obtains…”

Section: Nonzero Magnetic Field and Phase Diagrammentioning

confidence: 86%

Thermodynamically stable skyrmion lattice in tetragonal frustrated antiferromagnet with dipolar interaction

Utesov

2020

Preprint

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Motivated by recent experimental results on GdRu2Si2 [Khanh, N.D., Nakajima, T., Yu, X. et al., Nat. Nanotechnol. 15, 444-449 (2020)], where nanometric square skyrmion lattice was observed, we propose simple analytical mean-field description of the high-temperature part of the phase diagram of centrosymmetric tetragonal frustrated antiferromagnets with dipolar interaction in the external magnetic field. In the reciprocal space dipolar forces provide momentum dependent biaxial anisotropy. It is shown that in tetragonal lattice in the large part of the Brillouin zone for mutually perpendicular modulation vectors in the ab plane this anisotropy has mutually perpendicular easy axes and collinear middle axes, what leads to double-Q modulated spin structure stabilization. The latter turns out to be a square skyrmion lattice in the large part of its stability region with the topological charge ±1 per magnetic unit cell, which is determined by the frustrated exchange coupling, and, thus, nanometer-sized. In the presence of additional single-ion easy-axis anisotropy, easy and middle axes can be swapped, which leads to different phase diagram. It is argued that the latter case is relevant to GdRu2Si2.

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Spiral plane flops in frustrated helimagnets in external magnetic field

Cited by 9 publications

References 32 publications

Formation of spiral ordering by magnetic field in frustrated anisotropic antiferromagnets

Formation of spiral ordering by magnetic field in frustrated anisotropic antiferromagnets

Phase competition in frustrated anisotropic antiferromagnet in strong magnetic field

Thermodynamically stable skyrmion lattice in tetragonal frustrated antiferromagnet with dipolar interaction

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