The physics of magnetic domains

Bar’yakhtar, V. G.; Bogdanov, A. N.; Yablonskii, D. A.

doi:10.1070/pu1988v031n09abeh005621

Cited by 62 publications

(62 citation statements)

References 36 publications

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“…Really, the difference in free energy of the polydomain and monodomain state calculated from (1), (2) at the same external field value, * The similar equality holds true for DS corresponding to the so-called intermediate state that exists in the vicinity of the 1-st order spin-reorientation phase transition in the easy-axis AFM [3]. ** It is easy to check that another solution of (7), (8) with ψ eff = π/2 is energetically unfavorable.…”

Section: Mobile Domain Wallsmentioning

confidence: 82%

“…The structure of domain walls can be calculated in an analogy with general approaches (see [3]) by taking into account magnetic and elastic subsystems. It should be noted that in the defect-free sample the interdomain boundary are ideally conjugated and no stresses appear because of compatibility conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The origin of equilibrium domain structure (DS) in antiferromagnetic (AFM) insulators is studied for a long time [1,2], but the question is still obscure, despite a well developed theory for the close vicinity of the magnetic 1-st order phase transitions (in particular, for the field-induced spinflop transitions in the easy-axis antiferromagnets (see the review [3] and recent paper [4] where this theory has been generalized for the case of the hexagonal AFM with the easy-plane magnetic anisotropy)). The DS of the pure antiferromagnets is usually treated as the result of structural imperfections (such as dislocations, twins, impurities, etc.)…”

Section: Introductionmentioning

confidence: 99%

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On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet

Gomonaj

Локтев

1999

Low Temperature Physics

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Fizika Nizkikh Temperatur, 1999, v. 25, No 7, p. 699-707Gomonaj E. V. and Loktev V. M.On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnetGomonaj E. V. and Loktev V. M.On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet Macroscopic magnetoelastic domain structure of the defectless layered antiferromagnet of CoCl 2 -type with the «easy-plane» magnetic anisotropy is studied theoretically in the framework of phenomenological approach. In assumption of mobile domain walls, the finite-size effects are shown to result in the formation of a stable domain structure that changes reversibly under the action of the external magnetic field and can be treated as equilibrium. It is found that in antiferromagnets, where (in contrast to ferromagnets) long-range forces of magnetic origin are absent, the domain structure and its collective behavior are governed by elasticity. Field dependence of a domain structure, magnetostriction and low-frequency AFMR of poly-and monodomain samples are calculated, the external magnetic field being directed perpendicular to the main symmetry axis of the crystal. The results obtained are in qualitative agreement with the available experimental data. PACS: 75.50.Ee, 75.60.Ch E. V. Gomonaj and V. M. Loktev

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Section: Mobile Domain Wallsmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet

Gomonaj

Локтев

1999

Low Temperature Physics

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“…the staggered magnetization is again confined in the xz-plane but the potential (3.7) becomes 19) where γ 2 = κ + λ 2 is now field independent. Nevertheless, the external field reappears in a different form and requires a new calculation of the spiral based on Eq.…”

Section: Ground Statementioning

confidence: 99%

Intermediate phase in the spiral antiferromagnetBa2CuGe2O7
Chovan
¹
,
Papanicolaou
²
,
Komineas
³

2002
Phys. Rev. B
31
4
54
0
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The magnetic compound Ba2CuGe2O7 has recently been shown to be an essentially two-dimensional spiral antiferromagnet that exhibits an incommensurate-to-commensurate phase transition when a magnetic field applied along the c-axis exceeds a certain critical value Hc. The T = 0 dynamics is described here in terms of a continuum field theory in the form of a nonlinear σ model. We are thus in a position to carry out a complete calculation of the low-energy magnon spectrum for any strength of the applied field throughout the phase transition. In particular, our spin-wave analysis reveals field-induced instabilities at two distinct critical fields H1 and H2 such that H1 < Hc < H2. Hence we predict the existence of an intermediate phase whose detailed nature is also studied to some extent in the present paper.

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“…They are the building blocks for a domain theory. [29,30] For the case of laterally homogeneous states of each ferromagnetic sublayer one has a system that behaves like an antiferromagnetically coupled chain of Stoner-Wohlfarth particles.…”

Section: Introductionmentioning

confidence: 99%

Magnetic phases and reorientation transitions in antiferromagnetically coupled multilayers

Rößler

Bogdanov

2004

Phys. Rev. B

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In antiferromagnetically coupled superlattices grown on (001) faces of cubic substrates, e.g. based on materials combinations as Co/Cu, Fe/Si, Co/Cr, or Fe/Cr, the magnetic states evolve under competing influence of bilinear and biquadratic exchange interactions, surface-enhanced four-fold in-plane anisotropy, and specific finite-size effects. Using phenomenological (micromagnetic) theory, a comprehensive survey of the magnetic states and reorientation transitions has been carried out for multilayer systems with even number of ferromagnetic sub-layers and magnetizations in the plane. In two-layer systems (N = 2) the phase diagrams in dependence on components of the applied field in the plane include "swallow-tail" type regions of (metastable) multistate co-existence and a number of continuous and discontinuous reorientation transitions induced by radial and transversal components of the applied field. In multilayers (N ≥ 4) noncollinear states are spatially inhomogeneous with magnetization varying across the multilayer stack. For weak four-fold anisotropy the magnetic states under influence of an applied field evolve by a complex continuous reorientation into the saturated state. At higher anisotropy they transform into various inhomogeneous and asymmetric structures. The discontinuous transitions between the magnetic states in these two-layers and multilayers are characterized by broad ranges of multi-phase coexistence of the (metastable) states and give rise to specific transitional domain structures.

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The physics of magnetic domains

Cited by 62 publications

References 36 publications

On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet

On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet

Intermediate phase in the spiral antiferromagnetBa2CuGe2O7
Chovan
¹
,
Papanicolaou
²
,
Komineas
³

2002
Phys. Rev. B
31
4
54
0
View full text Add to dashboard Cite

Magnetic phases and reorientation transitions in antiferromagnetically coupled multilayers

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The physics of magnetic domains

Cited by 62 publications

References 36 publications

On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet

On the theory of equilibrium magnetoelastic domain structure in easy-plane antiferromagnet

Intermediate phase in the spiral antiferromagnetBa2CuGe2O7Chovan1, Papanicolaou2, Komineas3 2002Phys. Rev. B314540View full textAdd to dashboardCite

Magnetic phases and reorientation transitions in antiferromagnetically coupled multilayers

Contact Info

Product

Resources

About

Intermediate phase in the spiral antiferromagnetBa2CuGe2O7
Chovan
¹
,
Papanicolaou
²
,
Komineas
³

2002
Phys. Rev. B
31
4
54
0
View full text Add to dashboard Cite