FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2530537010> ?p ?o ?g. }

• W2530537010 abstract "Multiferroic materials, in which two or more ferroic ordering take place in the same phase, have driven major interest in the last few years, not only due to the possibility of exploring novel physical properties in those materials, but also the implications that such properties show in novel technological applications. From those materials, the especially interesting are those in which the ferromagnetic (FM) and ferroelectric (FE) ordering take place, due to their direct application in magnetodielectric devices. In the field of multiferroic materials such materials could play an important role in a new generation of none volatile magnetic random access memories (MRAM), in which a sufficiently strong magnetodielectric coupling could allow for the modification of the magnetic state, not only with a magnetic field, but with an electric field. This fact would allow for a dramatic reduction in energy consumption and would promote the further technological integration (the major commercial drawback of MRAMs), due to the fact that an electric field, contrary to the magnetic field, can be applied locally. Additionally, such multiferroic materials could prove useful in magnetic tunnel junctions, in which the ferroelectric and ferromagnetic nature would allow them to codify four resistive states, instead of the traditional two states of ferroelectric or ferromagnetic junctions, allowing for the implementation of a generation of four state memories. The materials with perovskite structure, ABB´O3 (A=Rare Earth, Bismuth, Lead and Yttrium), bring a broad spectrum of possibilities when it comes to design of multifunctional materials. This is due to the wide variety of A, B, B´ cations that are compatible with such structure. However, in the case of R(NiMn)O3, such oxides have been poorly studied and many detailed studies, both in bulk and thin films are needed. The cation selection of B and B’ seems to transform the paramagnetic ordering (PM) into FM below room temperature. The multiferroicity of these materials is typically provided by the A cation of the perovskite formula, which can be Bi or Pd, in order to create a Type 1 multiferroic. In this type of materials, i.e: Bi2NiMnO6, the ferroelectricity and ferromagnetism arose by separate mechanisms, the FE is provided by the A cation, with so called long pair electrons, which are free electrons in the valence band that do not participate in any chemical reaction in the compound, while the Ni2+(d8) and (Mn4+) (d3) provides the FM. However, even though the materials are multiferroic, their magnetodielectric coupling, crucial for future industrial applications, is weak, due to the different mechanisms that provide their FM and FE ordering. On the other hand, the FE induction by geometrical distortion of the perovskite lattice, for example in YMnO3, is an interesting case since rotations of the MnO6 octahedrons promote an important structural change, in which the oxygen atoms move closer to the Y and, due to a large dipole interaction, generate a stable FE state. Moreover, the deformation of the unit cell generates a weak spin canting on the Mn cations, that can be promoted by Li doping or lattice distortions. This behavior could prove useful in the R(NiMn)O6 family, which shows strong FM. This thesis is devoted to the study of R(Ni0.5Mn0.5)O3 (Y,Sm, Nd and Pr) and Bi(Fe0.5Mn0.5)O6 grown in thin films by pulsed laser deposition technique. Firstly, this thesis focuses on the growth and characterization of thin films of Y(Ni0.5Mn0.5)O3 (YNMO) on strontium titanate substrates SrTiO3(001) (STO). The influence of the deposition parameters, such as temperature, fluence and ablation frequency, on the morphology and crystalline quality of the films is investigated. The study reveals that the YNMO films grown on STO(001,011 and 111) substrates are epitaxial and that their crystalline quality and epitaxial relationship are similar to those of the YMO compound. In particular, it is observed that a single out of plane domain is the norm for all the substrate orientations, while there are various in-plane domains. Moreover, chemical composition studies reveal Ti diffusion from the substrate to the YNMO film when STO(111) substrates are used. Once the growth conditions of YNMO are optimized, the magnetic and dielectric properties are studied. All the films show a paramagnetic to ferromagnetic transition at a temperature around 95K, with a magnetic moment of YNMO(001) = 4.35μB/f.u, YNMO(100) = 4,4 μB/f.u and YNMO(101) = 3,7μB/f.u, confirming the ferromagnetic nature of the samples. The dielectric characterization reveal a FE ordering on the YNMO films, and what is more, the existence of a dielectric anisotropy on the films, that is characterized by the absence of ferroelectric response on YNMO samples deposited on STO(001), while YNMO samples on STO(111) show a strong FE response. This anisotropy could be explained, according to recent theoretical studies, in the improper origin of the observed ferroelectriciy. The coexistence of FM and FE response shows in a conclusive manner the multiferroic nature of the YNMO compound. Secondly, studies similar to those previously presented are performed for thin films of R(Ni0.5Mn0.5)O3 (Sm, Nd and Pr) compounds grown on STO(001). In this case the deposition temperature turns out to play a crucial role on the epitaxial growth of all the studied compounds. It is shown that the ratio between the b/a lattice parameters influences the epitaxial growth of the films, being the decisive factor between single or multi domain films. All the samples show a PM to FM transition at temperatures around 190K Finally, films of Bi(Fe0.5Mn0.5)O6 have been grown on STO(001) substrates. The films are epitaxial and grow under epitaxial strain. Samples show a FM behavior at room temperature with a weak signal of 7,42 emu/cm3 and 0,4 μB/f.u(Fe-Mn). The dielectrical characterization shows the influence of external magnetic fields on the dielectric properties of the film above room temperatura." @default.
• W2530537010 created "2016-10-21" @default.
• W2530537010 creator A5066606506 @default.
• W2530537010 date "2016-02-01" @default.
• W2530537010 modified "2023-09-24" @default.
• W2530537010 title "Growth and characterization of new multiferroic materials" @default.
• W2530537010 cites W1990833059 @default.
• W2530537010 cites W2009434238 @default.
• W2530537010 cites W2024375448 @default.
• W2530537010 cites W2028869613 @default.
• W2530537010 cites W2078010408 @default.
• W2530537010 cites W2085484451 @default.
• W2530537010 cites W2157227139 @default.
• W2530537010 cites W2170254950 @default.
• W2530537010 cites W2511680361 @default.
• W2530537010 hasPublicationYear "2016" @default.
• W2530537010 type Work @default.
• W2530537010 sameAs 2530537010 @default.
• W2530537010 citedByCount "0" @default.
• W2530537010 crossrefType "dissertation" @default.
• W2530537010 hasAuthorship W2530537010A5066606506 @default.
• W2530537010 hasConcept C121332964 @default.
• W2530537010 hasConcept C123266903 @default.
• W2530537010 hasConcept C133386390 @default.
• W2530537010 hasConcept C171250308 @default.
• W2530537010 hasConcept C192562407 @default.
• W2530537010 hasConcept C26873012 @default.
• W2530537010 hasConcept C2775869346 @default.
• W2530537010 hasConcept C2780841128 @default.
• W2530537010 hasConcept C49040817 @default.
• W2530537010 hasConcept C61696701 @default.
• W2530537010 hasConcept C79090758 @default.
• W2530537010 hasConcept C82217956 @default.
• W2530537010 hasConceptScore W2530537010C121332964 @default.
• W2530537010 hasConceptScore W2530537010C123266903 @default.
• W2530537010 hasConceptScore W2530537010C133386390 @default.
• W2530537010 hasConceptScore W2530537010C171250308 @default.
• W2530537010 hasConceptScore W2530537010C192562407 @default.
• W2530537010 hasConceptScore W2530537010C26873012 @default.
• W2530537010 hasConceptScore W2530537010C2775869346 @default.
• W2530537010 hasConceptScore W2530537010C2780841128 @default.
• W2530537010 hasConceptScore W2530537010C49040817 @default.
• W2530537010 hasConceptScore W2530537010C61696701 @default.
• W2530537010 hasConceptScore W2530537010C79090758 @default.
• W2530537010 hasConceptScore W2530537010C82217956 @default.
• W2530537010 hasLocation W25305370101 @default.
• W2530537010 hasOpenAccess W2530537010 @default.
• W2530537010 hasPrimaryLocation W25305370101 @default.
• W2530537010 hasRelatedWork W1550879483 @default.
• W2530537010 hasRelatedWork W1590861882 @default.
• W2530537010 hasRelatedWork W1649344300 @default.
• W2530537010 hasRelatedWork W2026112284 @default.
• W2530537010 hasRelatedWork W2040473277 @default.
• W2530537010 hasRelatedWork W2065249095 @default.
• W2530537010 hasRelatedWork W2143417147 @default.
• W2530537010 hasRelatedWork W2298853586 @default.
• W2530537010 hasRelatedWork W2374373307 @default.
• W2530537010 hasRelatedWork W2765852627 @default.
• W2530537010 hasRelatedWork W2773876530 @default.
• W2530537010 hasRelatedWork W2805025862 @default.
• W2530537010 hasRelatedWork W2902247847 @default.
• W2530537010 hasRelatedWork W3103351109 @default.
• W2530537010 hasRelatedWork W3124804167 @default.
• W2530537010 hasRelatedWork W3127270319 @default.
• W2530537010 hasRelatedWork W3186551521 @default.
• W2530537010 hasRelatedWork W3193921390 @default.
• W2530537010 hasRelatedWork W2187308715 @default.
• W2530537010 hasRelatedWork W2222940903 @default.
• W2530537010 isParatext "false" @default.
• W2530537010 isRetracted "false" @default.
• W2530537010 magId "2530537010" @default.
• W2530537010 workType "dissertation" @default.