Possibility of soft-matter effects in solids

Gomonay, Olena; Kornienko,; Loktev,

doi:10.5488/cmp.13.23701

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Position ξ 0 of the DW center is calculated from the boundary conditions (see below). In (15) we neglect the possible difference between the DW width ξ DW = (1/2) α/K ⊥ in the near-surface region and in the core. Substituting (15) in (11), we obtain the following equation for ϕ…”

Section: A Seed Distribution and Magnetoelastic Chargesmentioning

confidence: 99%

“…Understanding the mechanisms of the shape effects specific to AFM ordered systems is crucial for optimizing and finetuning the properties of AFM-based devices and clarifying the fundamental questions whether the shape effects reside in AFM with vanishingly small macroscopic magnetization, and which of peculiar AFM properties might depend on the particle shape. For this purpose we investigate the finite-size and shape effects in AFM particles, regardless of their macroscopic magnetization, combining two previously shown statements: i) the shape effects in AFM materials may originate from the long-range fields of "magnetoelastic" charges due to spontaneous magnetostriction below the Néel temperature (so called destressing fields) 14 ; ii) "magnetoelastic" charges may arise from the surface magnetic anisotropy 15 . We consider the particles with the characteristic size below the several critical lengths of monodomainization (which, for convenience, are referred to as "nanoparticles").…”

Section: Introductionmentioning

confidence: 99%

“…(a) Periodic (period d) domain structure, double arrows indicate orientation of AFM vectors inside domains and in the near-surface region (shaded horizontal stripe). (b) Space dependence of Lx(ξ) (solid line) calculated from(15) provided that ϕin = 0. The horizontal line defines the center ξ0 of a virtual full domain wall (dotted line).…”

mentioning

confidence: 99%

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Shape-induced anisotropy in antiferromagnetic nanoparticles

Gomonay¹,

Kondovych²,

Локтев³

2014

Journal of Magnetism and Magnetic Materials

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High fraction of the surface atoms considerably enhances the influence of size and shape on the magnetic and electronic properties of nanoparticles. Shape effects in ferromagnetic nanoparticles are well understood and allow to set and control the parameters of a sample that affect its magnetic anisotropy during production. In the present paper we study the shape effects in the other widely used magnetic materials -antiferromagnets, -which possess vanishingly small or zero macroscopic magnetization. We take into account the difference between the surface and bulk magnetic anisotropy of a nanoparticle and show that the effective magnetic anisotropy depends on the particle shape and crystallographic orientation of its faces. Corresponding shape-induced contribution to the magnetic anisotropy energy is proportional to the particle volume, depends on magnetostriction, and can cause formation of equilibrium domain structure. Crystallographic orientation of the nanoparticle surface determines the type of domain structure. The proposed model allows to predict the magnetic properties of antiferromagnetic nanoparticles depending on their shape and treatment.

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Section: A Seed Distribution and Magnetoelastic Chargesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shape-induced anisotropy in antiferromagnetic nanoparticles

Gomonay¹,

Kondovych²,

Локтев³

2014

Journal of Magnetism and Magnetic Materials

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“…In the case of an FM+AFM phase mixture, the inclusions of a new (FM or AFM, depending upon the direction of a phase transition) phase could be considered as elastic dipoles (due to the strain misfit between the FM and AFM phases). In the case of AFM+FM multiferroic, the analogous dipoles arise at the sample surface (see [14] for details). In both cases, the elastic dipoles produce long-range fields that could be taken into account phenomenologically with the use of the destressing energy…”

Section: Combined Influence Of a Magnetic Field And A Stress On The Mmentioning

confidence: 99%

Theory of magnetization in multiferroics: Competition between ferromagnetic and antiferromagnetic domains

2011

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37, Peremogy Ave., Kyiv 03056, Ukraine) PACS 75.85.+t, 75.60.Ch, 46.25.Hf, 75.50.Ee c 2011 Macroscopic properties of multiferroics, the systems that show simultaneously two types of ordering, could be controlled by the external fields of different nature. We analyze the behavior of multiferroics with antiferro-(AFM) and ferromagnetic (FM) ordering under the action of external magnetic and stress fields. A combination of these two fields makes it possible to achieve macroscopic states with different domain structures. The two-domain state obtained in this way shows a linear dependence of macroscopic strain vs magnetic field which is unusual for AFMs. A small but nonzero stress applied to the sample can also result in the bias of the magnetization vs magnetic field dependence.

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Spintronics of antiferromagnetic systems (Review Article)

Gomonay¹,

Локтев²

2014

Low Temperature Physics

460

346

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Spintronics of antiferromagnets is a new and rapidly developing field of the physics of magnetism. Even without macroscopic magnetization, antiferromagnets, similar to ferromagnetic materials are affected by spin-polarized current, and as in ferromagnets this phenomenon is based on a spin-dependent interaction between localized and free electrons. However, due to the nature of antiferromagnetic materials (complex magnetic structure, essential role of exchange interactions, absence of macroscopic magnetization) the study of possible spintronic effects requires new theoretical and experimental approaches. The purpose of this review is to systemize and describe recent developments in this area. After presenting the main features of structure and behavior of antiferromagnets various microscopic and phenomenological models for description of the current-induced phenomena in heterostructures containing ferro- and antiferromagnetic layers are considered. The questions related to an effect of antiferromagnetic ordering on an electric current, as well as the questions of possible creation of fully antiferromagnetic spin valves are discussed. In addition, we briefly discuss available experimental results and try to interpret them.

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Possibility of soft-matter effects in solids

Cited by 4 publications

References 7 publications

Shape-induced anisotropy in antiferromagnetic nanoparticles

Shape-induced anisotropy in antiferromagnetic nanoparticles

Theory of magnetization in multiferroics: Competition between ferromagnetic and antiferromagnetic domains

Spintronics of antiferromagnetic systems (Review Article)

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