Structural, Electronic and Magnetic Properties of Ferromagnetic Perovskites PDF Download
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Author: Rhian-Mari Thomas
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Languages : en
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Author: Rhian-Mari Thomas
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Languages : en
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Author: Asish K Kundu
Publisher: Springer
ISBN: 8132227611
Category : Technology & Engineering
Languages : en
Pages : 174
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Magnetic perovskite with multi functional properties (magneto-resistive, magneto-dielectric, multiferroics, spintronics, etc.) have attracted increasing attention due to their possible applications towards storage materials and intriguing fundamental Physics. Despite the numerous investigations on multi functional materials in the past few years, a very few magnetic perovskites have been known to realize as ferromagnetic-insulators. In perovskites centred transition metal oxides strong interplay between lattice, charge, spin and/or orbital degrees of freedom provide a fantastic playground to tune their physical properties. The main purpose of this book is to introduce the phenomenon and physics of complex magnetism (phase separation, spin glass, frustrations, etc.) in perovskite manganites and cobaltites via an experimental approach. The book is organized into four chapters; Chap. 1 gives a brief introduction of various interesting phenomena in magnetic perovskites. Chapter 2 describes the results of the investigations on electronic phase separation and glassy ferromagnetism of the hole-doped perovskite manganites and cobaltites. Ordered and disordered effects and related aspects in hole-doped perovskite cobaltites are described in Chap. 3. Finally, in Chap. 4 the bismuth based magnetic perovskite is discussed.
Author: Yue Jia
Publisher:
ISBN: 9780355149258
Category :
Languages : en
Pages :
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Perovskite oxides span a diverse range of functional properties such as ferromagnetism, superconductivity, and ferroelectricity, which makes them promising candidate materials for applications such as sensors, energy conversion and data storage devices. With recent advances in thin film deposition techniques, the precise manipulation of atomic layers on the unit cell level make it possible to synthesize epitaxial thin film heterostructures consisting of layers with different properties. The structural compatibility of perovskite oxides allows them to be epitaxially grown in complex heterostructures such as superlattices with a large density of interfaces where the interplay between spin, charge, orbital, and lattice degrees of freedom gives rise to new behaviors. The ferromagnetic (FM)/antiferromagnetic (AF) interface is particularly interesting due to exchange coupling which is not only of interest for fundamental research but also is of great significance for industrial applications[superscript 1,2]. Unlike metallic systems that have been studied for decades with wide ranges of applications in devices such as hard disk drives, thin films of complex metal oxides is a relatively new field. Perovskite oxides show much more diverse functional properties than metals and open new pathways for tailoring propertiestowards specific device applications. Epitaxial La[subscript 0.7]Sr[subscript 0.3]MnO3 (LSMO)/La[subscript 0.7]Sr[subscript 0.3]FeO3 (LSFO) superlattices serve as model systems to explore the magnetic structure and exchange coupling at perovskite oxide interfaces. Earlier work suggested that (001)-oriented LSMO/LSFO superlattices with compensated AF spins at the interface display spin-flop coupling characterized by perpendicular alignment between the AF spin axes and the FM moments at a sublayer thickness of 6 unit cells (u.c.) [superscript 3-5]. Changing the crystallographic orientation of the interface from (001) to (111) introduces changes to factors such as the charge density of each stacking layer, the magnetic structure of the AF layer at the interface, the symmetry of the lattice, and the orbital degeneracy. Therefore, different properties and exchange coupling mechanisms are expected. (111)-oriented LSMO/LSFO superlattices with sublayer thicknesses ranging from 3 to 60 u.c. were synthesized and characterized. Detailed analysis of their structural, electronic, and magnetic properties were performed using synchrotron radiation based resonant x-ray reflectivity, soft x-ray magnetic spectroscopy, and photoemission electron microscopy to explore the effect of sublayer thickness on the magnetic structure and exchange coupling at (111)-oriented perovskite oxide interfaces. Interfacial effects and ultrathin superlattice sublayers can stabilize orientations of the LSFO AF spin axis which differ from that of LSFO films and LSMO/LSFO bilayers. In the ultrathin limit (3 to 6 u.c.), it was found that the AF properties of the LSFO sublayers are preserved with an out-of-plane canting of the AF spin axis, while the FM properties of the LSMO sublayers are significantly depressed. For thicker LSFO layers (> 9 u.c.), the out-of-plane canting of the AF spin axis is only present in superlattices with thick LSMO sublayers. As a result, exchange coupling in the form of spin-flop coupling exists only in superlattices which display both robust ferromagnetism and out-of-plane canting of the AF spin axis. A portion of the AF moments can be reoriented by a moderate external magnetic field through spin-flop coupling with the FM LSMO sublayers that have low magnetocrystalline anisotropy in the (111) plane. The AF order in the spin-flop coupled superlattices was studied using angle-dependent x-ray magnetic linear dichroism. The AF order can be categorized into two types: majority of the AF moments cant out-of-the-plane of the film along the 110 or 100 directions depending on the LSFO layer thickness, while a minority portion lies within the (111) plane in different AF domains. The energy difference between domains with their spin axes along the in-plane or out-of-plane directions is small, and the magnetic order of AF thin films is far more complex than in bulk LSFO. The complex AF structure in these (111)-oriented LSMO/LSFO superlattices illustrates that complex metal oxide heterostructures can serve as fertile ground for discovery of new magnetic phases, which have potential applications in next generation information technology devices.
Author:
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Languages : en
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Author: Claudia Felser
Publisher: Springer
ISBN: 3319214497
Category : Technology & Engineering
Languages : en
Pages : 492
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This book gives an overview of the physics of Heusler compounds ranging from fundamental properties of these alloys to their applications. Especially Heusler compounds as half-metallic ferromagnetic and topological insulators are important in condensed matter science due to their potential in magnetism and as materials for energy conversion. The book is written by world-leaders in this field. It offers an ideal reference to researchers at any level.
Author: Natalia Chezhina
Publisher: CRC Press
ISBN: 0429512597
Category : Science
Languages : en
Pages : 247
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Book Description
This book is a short survey of magnetochemistry as a promising method for revealing the electronic structure of inorganic substances, particularly solid oxide materials. It is supported by five chapters that describe materials with various structures and applications, showing how the method of magnetic dilution with the aid of other physical methods (electron spin resonance, magnetization, Raman and Mössbauer spectroscopy, and electrical conductivity), accompanied by thorough structural and quantum mechanical studies, may be used for describing the states of atoms and interatomic interactions in multicomponent oxide systems. The book will serve as a guide for researchers in the field of various oxide materials, since it shows the roots for selecting the best structures and qualitative and quantitative compositions of oxide materials on the basis of the knowledge about their electronic structure. It is devoted to some of the most popular structures of multicomponent oxides among modern materials—perovskites and pyrochlores—giving a unified approach to their chemical structure.
Author: Aida Binti Mustapha
Publisher: Springer Nature
ISBN: 9811689032
Category : Science
Languages : en
Pages : 464
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This book presents peer-reviewed articles and recent advances on the potential applications of Science and Mathematics for future technologies, from the 7th International Conference on the Applications of Science and Mathematics (SCIEMATHIC 2021), held in Malaysia. It provides an insight about the leading trends in sustainable Science and Technology. The world is looking for sustainable solutions to problems more than ever. The synergistic approach of mathematicians, scientists and engineers has undeniable importance for future technologies. With this viewpoint, SCIEMATHIC 2021 has the theme “Quest for Sustainable Science and Mathematics for Future Technologies”. The conference brings together physicists, mathematicians, statisticians and data scientists, providing a platform to find sustainable solutions to major problems around us. The works presented here are suitable for professionals and researchers globally in making the world a better and sustainable place.
Author: David J. Singh
Publisher: Springer Science & Business Media
ISBN: 1475723121
Category : Technology & Engineering
Languages : en
Pages : 121
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Over the past decade the world's technological and industrial base has become increasingly dependent on advanced materials. There is every indication that this trend will accelerate and that progress in many areas will increasingly depend on the development of new materials and processing techniques. A second and equally significant trend is the continuing ascent of the information technologies, which now touch almost every aspect of life in some way. In this environment it is natural that there is a strong interest in using numerical modeling in materials science. With its extreme accuracy and reasonable computational efficiency, the linearized augmented plane wave (LAPW) method has emerged as the standard by which density functional calculations for transition metal and rare-earth containing materials are judged. Planewaves, Pseudopotentials and the LAPW Method presents a thorough and self-contained exposition of the LAPW method, making this powerful technique more accessible to researchers and students who have some familiarity with local density approximation calculations. Theory is discussed, but the emphasis is on how practical implementation proceeds. In addition, the author suggests future directions for adapting the LAPW method to simulations of complex materials requiring large unit cells. He does this by elucidating the connections between the LAPW method and planewave pseudopotential approaches and by showing how Car--Parrinello type algorithms can be adapted to the LAPW method. Planewaves, Pseudopotentials and the LAPW Method is a valuable resource for researchers already involved in electronic structure calculations, as well as for newcomers seeking quick mastery of the LAPW technique.
Author: Rachid Masrour
Publisher: Springer Nature
ISBN: 3031489675
Category : Technology & Engineering
Languages : en
Pages : 128
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This book undertakes an extensive exploration of manganese-based compounds, such as T1−xSrxMnO3 (T = La, Pr; x = 0.35, 0.25) using density functional theory and Monte Carlo simulations with a focus on understanding their electronic, magnetic, and magnetocaloric properties. Ba1−xSrxFeO3 (x = 0, 0.2) is also studied via different approximations, offering a comparative perspective. In addition, the book looks at the influence of magnetism using Monte Carlo simulations, revealing crucial parameters and examining the GdCrO3 system through DFT and Monte Carlo simulation, shedding light on recent experimental observations. Additionally, Monte Carlo studies investigate magnetic and magnetocaloric features of Sr2FeMoO6, La2SrMn2O7 bilayer manganite, perovskite ferromagnetic thin films' surface effects, and SmFe1−xMnxO3 perovskite. In essence, this book significantly advances our comprehension of magnetic and magnetocaloric phenomena across diverse materials and is well-suited for both experimentalists and computational researchers working in this field.
Author: Jennifer Rose Soliz
Publisher:
ISBN:
Category :
Languages : en
Pages : 249
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Abstract: In this entire work, we characterize the structural, electrical, and magnetic properties of many novel magnetic polycrystalline materials. Our focus is to investigate these properties to enhance the scientific community and possibly pave the road to explore into other directions, such as growing thin films. we investigate the effect of charge carrier substitution with chemical disorder for Ca1-xLaxMn0.5Ru0.5O3 (x = 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, and 0.0) double perovskites. X-ray diffraction measurements showed these polycrystalline powders to be phase pure and to exhibit Pnma symmetry with a b+a- octahedral tilting. Neutron powder diffraction (NPD) showed that the crystal structure and magnetic moments do not change significantly across the substitution range. Ca0.5La0.5Mn0.5Ru0.5O3 exhibits ferrimagnetism. NPD further concluded the lack of cooperative Jahn Teller distortion. Density functional theory (DFT) calculations confirmed that the extra 1/2 electron is responsible for opening the band gap, in that 0.295e and 0.17e is being transferred to the Ru and Mn bands, respectively. Thus, the Fermi level is being tuned when La3+ is substituted into the system. DFT calculations also showed ferrimagnetism to be the most energetically stable magnetic phase. Overall we conclude that despite the chemical disorder, Ca0.5La0.5Mn0.5Ru0.5O3 is an insulating ferrimagnet with a Curie temperature (TC) of 233 K, which is a rare finding to have chemical disorder with magnetic order. The next chapter, we examine the effects of isovalent substitution in Ba1-xSrxMn0.5Ru0.5O3 system. We explore how the larger cation, Ba2+, impacts the structural, electrical, and magnetic properties. We find that BaMn0.5Ru0.5O3 crystallizes in the 9R polymorph with R-3m symmetry. BaMn0.5Ru0.5O3 is an insulating canted antiferromagnet with a TN of 36 K. From neutron diffraction, Mn1 and Mn2 have magnetic moment values of 1.60(4) uB/f.u. and 2.15(2) uB/f.u., respectively. For simplicity, the Ru moments were not refined. While the refined moments are low for Mn3+/4+, it is assumed that Ru is contributing to the magnetic moments. Ba0.5Sr0.5Mn0.5Ru0.5O3 crystallizes with the 6H crystal structure which has P63/mmc symmetry. From low temperature neutron diffraction, Ba0.5Sr0.5Mn0.5Ru0.5O3 exhibits glassy behavior since it lacks long range magnetic order. Resistivity measurements show this compound to be an insulator. In the following chapter, we continue studying Ba1-xAxMn0.5Ru0.5O3 perovskites by substituting in charge carriers. We explore the effects of aliovalent substitution, La3+, by investigating the structural, magnetic, and electrical properties for the phase diagram of Ba1 xLaxMn0.5Ru0.5O3 system. The end members were found to be phase pure solid solutions while the in between compositions were heterogeneous mixtures. While BaMn0.5Ru0.5O3 exhibits the 9R as noted above, Ba0.5La0.5Mn0.5Ru0.5O3 manifests the 3C (I4/mcm space group symmetry) crystal structure and is an insulating ferrimagnet with a TC of 205 K. From neutron diffraction, both the ferromagnetic and ferrimagnetic structures have similar refinement values. However, the moments obtained from a ferrimagnetic structure (Mn = 3.7 uB/f.u. and Ru = -0.88(2) uB/f.u.) are more reasonable than for a ferromagnetic structure (Mn = 1.707(7) uB/f.u. and Ru = 1.707(7) uB/f.u.). Plus the magnetization shows Ba0.5La0.5Mn0.5Ru0.5O3 to have 1.54 uB/f.u., which is closer in value to the expected spin only ferrimagnetic moment for Mn3+ + Ru4+ oxidation states. Thus we conclude that Ba0.5La0.5Mn0.5Ru0.5O3 is a ferrimagnet based on the refined magnetic moments gathered from neutron diffraction and the magnetization results from SQUID. Thin films of Sr2CrReO6 have been reported to be metallic (possibly half-metallic) with a high Curie temperature (635K), which makes this material a feasible candidate for spintronic applications. To understand the role of doping, investigations of the structural, electrical, and magnetic properties of on and off stoichiometric Sr2+xCrReO6 (x = -0.07, 0.0, 0.05, 0.075, and 0.10), Sr2Cr1+yRe1 yO6 (y = 0.1, 0.05, 0.05, and 0.1), and A-site substituted Sr2-zAzCrReO6 (A = K, Ca, and La; z = 0.10 and 0.20; z = 1.0 only for Ca) samples have been achieved. Varying the Cr/Re ratio and aliovalent substitutions on the A-site lead to systematic variations in the magnetization and Curie temperatures. As the Re oxidation state increases, the saturation magnetization increases and the Curie temperature decreases. In the last chapter, we investigate the structural, magnetic, and electrical properties of phase pure polycrystalline Sr2CrOsO6. From X-ray powder diffraction, Sr2CrOsO6 adopts the symmetry and is 73.6(3) % ordered. Our magnetic results show Sr2CrOsO6 to be a ferrimagnet with a small net moment of 0.224 uB/f.u. and the coercitivity to be 7.84 T at 4.5 K in a field strength of 35 T, and the Curie temperature is 660 K. Sr2CrOsO6 is strongly insulating with resistivity of 0.0861 [omega]*cm at 300 K and shows activated electron transport.
