Long-range chemical interactions in solid-state reactions: effect of an inert Ag interlayer on the formation of L1<sub>0</sub>-FePd in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) trilayers

Myagkov, V. G.; Bayukov, O. A.; Mikhlin, Yu. L.; Жигалов, В. С.; Быкова, Л. Е.; Бондаренко, Г. Н.

doi:10.1080/14786435.2014.926037

Cited by 13 publications

(7 citation statements)

References 109 publications

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“…Under the influence of chemical interactions that arise above the initiation temperature T in , the chemical bonds break in the reactants, and the reacting atoms migrate into the reaction zone to synthesize new compounds. Previously, it was shown that the initiation temperatures T in are close to or coincide with the solid-state transformation temperatures T k of several reagent-based binary systems, such as order-disorder transitions, the superionic transition, the spinodal decomposition, martensitic transformations and others [46][47][48] . This suggests that the same chemical interactions underlie and control both the solid-state thin-film reactions and the corresponding solid-state transformations.…”

Section: Discussionmentioning

confidence: 88%

“…However, many thin-film reactions are initiated near room temperature and even occur at cryogenic temperatures. At such low temperatures diffusion is extremely small and cannot provide atomic transfer in a solid state [46][47][48] . This suggests an alternative view, in which not diffusion, but chemical interactions play a crucial role in the initiation and kinetics of solid state interfacial reactions.…”

Section: Discussionmentioning

confidence: 99%

“…Our approach assumes ~ 100 °C is the starting temperature of the formation of the B2 phase, which is associated with the reversible AFM-FM transition, and the synthesis temperatures T in (α h ʹ) = ~ 450 °C and T in (γ) = ~ 500 °C of the α h ʹ and γ phases coincide with the phase transition temperatures in the Fe-rich and Rh-rich regions of the Fe-Rh system, respectively. Such an approach is justified by us for the well-studied Fe-Ni system 62 and made it possible to predict phase transformations in other binary metallic systems [46][47][48] . Therefore, further study of solidstate reactions in Rh/Fe films, depending on the composition, will make it possible to specify the low-temperature part of the Fe-Rh phase diagram, which still remains unknown 63 .…”

Section: Discussionmentioning

confidence: 99%

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Solid-state synthesis, magnetic and structural properties of interfacial B2-FeRh(001) layers in Rh/Fe(001) films

Myagkov

Ivanenko

Быкова

et al. 2020

Sci Rep

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Here we first report results of the start of the solid-state reaction at the Rh/Fe(001) interface and the structural and magnetic phase transformations in 52Rh/48Fe(001), 45Rh/55Fe(001), 68Rh/32Fe(001) bilayers from room temperature to 800 °C. For all bilayers the non-magnetic nanocrystalline phase with a B2 structure (nfm-B2) is the first phase that is formed on the Rh/Fe(001) interface near 100 °C. Above 300 °C, without changing the nanocrystalline B2 structure, the phase grows into the low-magnetization modification α l ʹ (M S l ~ 825 emu/cm 3) of the ferromagnetic α ʹ phase which has a reversible α l ʹ ↔ αʺ transition. After annealing 52Rh/48Fe(001) bilayers above 600 °C the α l ʹ phase increases in grain size and either develops into α h ʹ with high magnetization (M S h ~ 1,220 emu/cm 3) or remains in the α l ʹ phase. In contrast to α l ʹ, the α h ʹ ↔ αʺ transition in the α h ʹ films is completely suppressed. When the annealing temperature of the 45Rh/55Fe(001) samples is increased from 450 to 800 °C the low-magnetization nanocrystalline α l ʹ films develop into high crystalline perfection epitaxial α h ʹ(001) layers, which have a high magnetization of ~ 1,275 emu/cm 3. α h ʹ(001) films do not undergo a transition to an antiferromagnetic αʺ phase. In 68Rh/32Fe(001) samples above 500 °C non-magnetic epitaxial γ(001) layers grow on the Fe(001) interface as a result of the solid-state reaction between the epitaxial α l ʹ(001) and polycrystalline Rh films. Our results demonstrate not only the complex nature of chemical interactions at the low-temperature synthesis of the nfm-B2 and α l ʹ phases in Rh/Fe(001) bilayers, but also establish their continuous link with chemical mechanisms underlying reversible α l ʹ ↔ αʺ transitions. An intriguing feature of the equilibrium diagram of the Fe-Rh system is the existence of the low-temperature transition at T K αʺ→αʹ ~ 100 °C between antiferromagnetic (AFM) αʺ and ferromagnetic (FM) αʹ phases in a narrow (0.48 < x Rh < 056) concentration interval in chemically ordered B2-FeRh alloys 1. This transition is accompanied by an isotropic volume expansion of ~ 1% of the B2-FeRh unit cell, which not only radically changes the magnetic properties, but also changes the entropy 2,3 and resistivity 4. The magnetostructural αʺ → αʹ (AFM-FM) transition gives existence to the giant magnetostriction 5 large magnetoresistance 6,7 and magnetocaloric effects 8 in B2-FeRh alloys. Numerous studies of bulk samples indicate that the starting temperature T K αʺ→αʹ and characteristics of the αʺ → αʹ transition may be modified by variations the magnetic field 9,10 , microstructure 11 , thermal treatment 12 , energetic ion irradiation 13 , stress 14 and hydrostatic pressure 15-17 and can also be tuned over a wide temperature range (100-600 K) by chemical substitution 9,18. Although bulk B2-FeRh samples exhibit a sharp transition with a small thermal hysteresis, thin films and nanoparticles often have an incomplete and broad asymmetrical hysteresis AFM-FM transition 1,19-34. The starting transition...

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Solid-state synthesis, magnetic and structural properties of interfacial B2-FeRh(001) layers in Rh/Fe(001) films

Myagkov

Ivanenko

Быкова

et al. 2020

Sci Rep

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“…As is known, thin-film solid-state reactions start when the temperature of a sample T S exceeds the initiation (formation) temperature T in (T S >T in ). For metallic thin-film reactions the initiation temperature T in can be below room temperature or even below 90 K [39,16]. Recently we showed that the initiation temperature of the Mn 5 Ge 3 compound is equal to T in (Mn 5 Ge 3 ) ~ 120°C [14][15][16] and the Ge is the sole diffusing species [16].…”

Section: Discussionmentioning

confidence: 99%

Solid-state synthesis and characterization of ferromagnetic Mn5Ge3 nanoclusters in GeO/Mn thin films

Myagkov

Мацынин

Быкова

et al. 2019

Journal of Alloys and Compounds

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Mn 5 Ge 3 films are promising materials for spintronic applications due to their high spin polarization and a Curie temperature above room temperature. However, non-magnetic elements such as oxygen, carbon and nitrogen may unpredictably change the structural and magnetic properties of Mn 5 Ge 3 films. Here, we use the solid-state reaction between Mn and GeO thin films to describe the synthesis and the structural and magnetic characterization of Mn 5 Ge 3 (Mn 5 Ge 3 O y)-GeO 2 (GeO x) nanocomposite materials. Our results show that the synthesis of these nanocomposites starts at 180°С when the GeO decomposes into elemental germanium and oxygen and the resulting Ge atoms immediately migrate into the Mn layer to form ferromagnetic Mn 5 Ge 3 nanoclusters. At the same time the oxygen atoms take part in the synthesis of GeO x and GeO 2 oxides and also migrate into the Mn 5 Ge 3 lattice to form Mn 5 Ge 3 O y Nowotny nanoclusters. Our findings prove that not only carbon, but oxygen may contribute to the increase of the magnetization saturation and Curie temperature of Mn 5 Ge 3based nanostructures.

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“…Одной из удивительных находок, установленной в ходе исследований металлических трехслойных пленок, является наблюдение неожиданного взаимного расположения возникающих фаз [1,4]. Необычность, наблюдаемая в [1] на примере пленок Ge/Ag/Mn, заключается в том, что интерметаллиды, формирующиеся в двухслойных пленках, состоящих только из верхнего и нижнего слоев трехслойной системы, формируются и в случае трехслойной системы, причем буферный слой оказывается химически чистым.…”

Section: Introductionunclassified

Особенности протекания твердофазных реакций в трехслойной пленочной системе Sn/Fe/Cu

Балашов,

Мягков,

Быкова

et al. 2023

Журнал Технической Физики

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Study of the mechanisms of the solid-state reactions in Sn/Fe/Cu thin films is interesting both from a fundamental point of view and from a view of the importance of emerging intermetallics in the technology of solder joints and thin-film lithium-ion batteries. By the integrated approach, including both X-ray phase analysis and local elemental analysis of the cross-sections of the films, the phase composition and the mutual arrangement of phases were studied, at various stages of the solid-state reaction occurring at different temperatures. The observed sequence of the appearing phases differs significantly from the expected one if the mass transfer took place by a volume diffusion through the forming layers.

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Long-range chemical interactions in solid-state reactions: effect of an inert Ag interlayer on the formation of L1₀-FePd in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) trilayers

Cited by 13 publications

References 109 publications

Solid-state synthesis, magnetic and structural properties of interfacial B2-FeRh(001) layers in Rh/Fe(001) films

Solid-state synthesis, magnetic and structural properties of interfacial B2-FeRh(001) layers in Rh/Fe(001) films

Solid-state synthesis and characterization of ferromagnetic Mn5Ge3 nanoclusters in GeO/Mn thin films

Особенности протекания твердофазных реакций в трехслойной пленочной системе Sn/Fe/Cu

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Long-range chemical interactions in solid-state reactions: effect of an inert Ag interlayer on the formation of L10-FePd in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) trilayers

Cited by 13 publications

References 109 publications

Solid-state synthesis, magnetic and structural properties of interfacial B2-FeRh(001) layers in Rh/Fe(001) films

Solid-state synthesis, magnetic and structural properties of interfacial B2-FeRh(001) layers in Rh/Fe(001) films

Solid-state synthesis and characterization of ferromagnetic Mn5Ge3 nanoclusters in GeO/Mn thin films

Особенности протекания твердофазных реакций в трехслойной пленочной системе Sn/Fe/Cu

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Product

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Long-range chemical interactions in solid-state reactions: effect of an inert Ag interlayer on the formation of L1₀-FePd in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) trilayers