Interaction of Superconductivity and Ferromagnetism in YBCO-LCMO Heterostructures
Author: Soltan Soltan
Publisher: Cuvillier Verlag
Published: 2005
Total Pages: 166
ISBN-13: 3865373496
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Interaction of Superconductivity and Ferromagnetism in YBCO/LCMO Heterostructures
Author:
Publisher: Cuvillier Verlag
Published: 2005-02-02
Total Pages: 170
ISBN-13: 3736913494
DOWNLOAD EBOOK →Die Wechselwirkung von Ferromagnetismus und Supraleitung wird anhand von Mehrfachschichten aus dem Ferromagneten La2=3Ca1=3MnO3 (LCMO) und dem Supraleiter YBa2Cu3O7¡± (YBCO) studiert. Die Tatsache, dass die Gitterparameter der ab-Ebenen dieser Materialien sehr ähnlich sind, erlaubt ein epitakisches Wachstum von LCMO/YBCO Schichten, Heterostrukturen und Überstrukturen mit strukturell scharfen Grenzschichten. Diese LCMO/YBCO-Strukturen repräsentieren adäquate Modelsysteme, um die Wechselwirkung der zwei antagonistischen Ordnungsphänomene zu untersuchen. Obwohl die Erforschung des Proximity-Effektes vor 40 Jahren begann, wurde die Technologie zur Herstellung und Messung von Proben mit mesoskopischen Ausdehnungen erst vor kurzem entwickelt, insbesondere wurde es möglich, Supraleiter/Normalleiter-Strukturen zu untersuchen, welche aus dünnen Schichten bestehen, deren Dicken kleiner als die Kohärenzlänge des Supraleiters ist. Solche Strukturen verhalten sich wie isolierte Supraleiter mit nicht trivialen Eigenschaften.
Fundamentals of Low Dimensional Magnets
Author: Ram K. Gupta
Publisher: CRC Press
Published: 2022-08-29
Total Pages: 380
ISBN-13: 1000640175
DOWNLOAD EBOOK →A low-dimensional magnet is a key to the next generation of electronic devices. In some respects, low-dimensional magnets refer to nanomagnets (nanostructured magnets) or single-molecule magnets (molecular nanomagnets). They also include the group of magnetic nanoparticles, which have been widely used in biomedicine, technology, industries, and environmental remediation. Low-dimensional magnetic materials can be used effectively in the future in powerful computers (hard drives, magnetic random-access memory, ultra-low power consumption switches, etc.). The properties of these materials largely depend on the doping level, phase, defects, and morphology. This book covers various nanomagnets and magnetic materials. The basic concepts, various synthetic approaches, characterizations, and mathematical understanding of nanomaterials are provided. Some fundamental applications of 1D, 2D, and 3D materials are covered. This book provides the fundamentals of low-dimensional magnets along with synthesis, theories, structure-property relations, and applications of ferromagnetic nanomaterials. This book broadens our fundamental understanding of ferromagnetism and mechanisms for realization and advancement in devices with improved energy efficiency and high storage capacity.
Magnetic Materials
Author: Amitabha Ghoshray
Publisher: American Institute of Physics
Published: 2008-04-22
Total Pages: 356
ISBN-13:
DOWNLOAD EBOOK →All papers have been peer-reviewed. For researchers in Condensed Matter Physics, this conference provided a forum for presentation and discussion of the new concepts and developments in magnetic materials encompassing the areas like: (1) molecular magnet, (2) magnetic thin film and multilayer, (3) nanoparticle, (4) alloy and intermetallic, (5) transition metal oxides (6) frustated, spin glass and amorphous material and (7) magnetic semiconducors. New results obtained using experimental techniques like: (a) magnetization and magneto-transport and magneto-calorie, (b) scattering techniques (light and neutron), and (c) resonance techniques (EPR, NMR and Mossbauer) as well as many important theoretical developments were discussed.
Critical Currents and Superconductivity
Author: Samir Khene
Publisher: CRC Press
Published: 2016-04-27
Total Pages: 159
ISBN-13: 149877511X
DOWNLOAD EBOOK →The book comprises six chapters which deal with the critical currents and the ferromagnetism-superconductivity coexistence in high-Tc oxides. It begins by gathering key data for superconducting state and the fundamental properties of the conventional superconductors, followed by a recap of the basic theories of superconductivity. It then discusses
Oxide Spintronics
Author: Tamalika Banerjee
Publisher: CRC Press
Published: 2019-05-28
Total Pages: 225
ISBN-13: 0429886896
DOWNLOAD EBOOK →Oxide materials have been used in mainstream semiconductor technology for several decades and have served as important components, such as gate insulators or capacitors, in integrated circuits. However, in recent decades, this material class has emerged in its own right as a potential contender for alternative technologies, generally designated as ‘beyond Moore’. The 2004 discovery by Ohtomo and Hwang was a global trendsetter in this context. It involved observing a two-dimensional, high-mobility electron gas at the heterointerface between two insulating oxides, LaAlO3 and SrTiO3, supported by the rise of nascent deposition and growth-monitoring techniques, which was an important direction in materials science research. The quest to understand the origin of this unparalleled physical property and to find other emergent properties has been an active field of research in condensed matter that has united researchers with expertise in diverse fields such as thin-film growth, defect control, advanced microscopy, semiconductor technology, computation, magnetism and electricity, spintronics, nanoscience, and nanotechnology.
Active Control of Superconductivity by Means of the Ferromagnetic Exchange Interaction
Author: Robert Kinsey
Publisher:
Published: 2001
Total Pages:
ISBN-13:
DOWNLOAD EBOOK →Recent theoretical studies have suggested that the observed suppression of superconductivity in superconductor/ferromagnet (S/F) heterostructures could be modulated by controlling the ferromagnetic exchange interaction in the superconductor. The exchange interaction in the superconductor is the sum of the exchange interaction from the ferromagnetic regions, which has a phase and magnitude that depends upon the direction that the ferromagnet is magnetised and the distance. As the exchange interaction has a phase it is possible that the contribution from two regions will cancel out. The exchange interaction, which can be viewed as an imbalance in the spin populations, suppresses superconductivity so any reduction in the exchange interaction will increase the superconducting transition temperature (Tc) of the heterostructure. Thus by changing the magnetisation of the ferromagnetic regions it is possible to control the exchange interaction in the superconductor and so the superconducting properties of the heterostructure. I have measured the superconducting properties of niobium/cobalt bilayers as a function of the applied magnetic field. I have observed that one component of the superconducting properties is controlled by the net magnetisation rather than the magnitude of the applied field. I have been able to show that this component of the observed change in the superconducting properties is not simply due to stray magnetic field but that the superconductivity is being actively controlled by means of the exchange interaction. This is the first experimental evidence that the superconducting properties of a S/F heterostructure can be controlled in this way, which opens up the possibilities for the construction of future devices.
Photoenergy and Thin Film Materials
Author: Xiao-Yu Yang
Publisher: John Wiley & Sons
Published: 2019-03-19
Total Pages: 650
ISBN-13: 1119580471
DOWNLOAD EBOOK →This book provides the latest research & developments and future trends in photoenergy and thin film materials—two important areas that have the potential to spearhead the future of the industry. Photoenergy materials are expected to be a next generation class of materials to provide secure, safe, sustainable and affordable energy. Photoenergy devices are known to convert the sunlight into electricity. These types of devices are simple in design with a major advantage as they are stand-alone systems able to provide megawatts of power. They have been applied as a power source for solar home systems, remote buildings, water pumping, megawatt scale power plants, satellites, communications, and space vehicles. With such a list of enormous applications, the demand for photoenergy devices is growing every year. On the other hand, thin films coating, which can be defined as the barriers of surface science, the fields of materials science and applied physics are progressing as a unified discipline of scientific industry. A thin film can be termed as a very fine, or thin layer of material coated on a particular surface, that can be in the range of a nanometer in thickness to several micrometers in size. Thin films are applied in numerous areas ranging from protection purposes to electronic semiconductor devices. The 16 chapters in this volume, all written by subject matter experts, demonstrate the claim that both photoenergy and thin film materials have the potential to be the future of industry.
Selective Interlayer Ferromagnetic Coupling Between the Cu Spins in YBa2Cu3O7-x Grown on Top of La0.7Ca0.3MnO3
Author:
Publisher:
Published: 2015
Total Pages:
ISBN-13:
DOWNLOAD EBOOK →Studies to date on ferromagnet/d-wave superconductor heterostructures focus mainly on the effects at or near the interfaces while the response of bulk properties to heterostructuring is overlooked. Here we use resonant soft x-ray scattering spectroscopy to reveal a novel c-axis ferromagnetic coupling between the in-plane Cu spins in YBa2Cu3O7-x (YBCO) superconductor when it is grown on top of ferromagnetic La0.7Ca0.3MnO3 (LCMO) manganite layer. This coupling, present in both normal and superconducting states of YBCO, is sensitive to the interfacial termination such that it is only observed in bilayers with MnO2 but not with La0.7Ca0.3O interfacial termination. Thus, such contrasting behaviors, we propose, are due to distinct energetic of CuO chain and CuO2 plane at the La0.7Ca0.3O and MnO2 terminated interfaces respectively, therefore influencing the transfer of spin-polarized electrons from manganite to cuprate differently. Our findings suggest that the superconducting/ferromagnetic bilayers with proper interfacial engineering can be good candidates for searching the theorized Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state in cuprates and studying the competing quantum orders in highly correlated electron systems.
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