Synthesis, Characterization, and Theoretical Studies of Room Temperature Ferromagnetic Silicide Nanowires for Spintronic Applications PDF Download

Author: Ángel Roberto Ruiz Reyes
Publisher:
ISBN:
Category :
Languages : en
Pages : 170

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Author: Farzad Nasirpouri
Publisher: World Scientific
ISBN: 9814273058
Category : Science
Languages : en
Pages : 401

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Book Description
Nanomagnetism and spintronics are two close subfields of nanoscience, explaining the effect of substantial magnetic properties of matter when the materials fabrication is realized at a comparable length size. Nanomagnetism deals with the magnetic phenomena specific to the structures having dimensions in the submicron range. The fact that the electronic transport properties of materials are dependent on the magnetic properties' artificial nanostructures, i.e., giant magnetoresistance (GMR) or tunneling magnetoresistance (TMR), has revolutionized spintronics science and technology. This book explains the concepts of nanomagnetism and spintronics by viewing the most recent research works from internationally distinguished research groups. Placing special emphasis on crucial fundamental and technical aspects of nanomagnetism and spintronics, it serves as a one-stop reference for universities offering postgraduate programs in nanotechnology or related disciplines. This unique book deals with all three stages required for conducting research in nanomagnetism and spintronics including fabrication, characterization and applications of nanomagnetic and spintronics materials, providing general concepts and an insightful overview of this subject for research students and scientists from different backgrounds investigating the multidisciplinary area of nanotechnology.

Author: J Arbiol
Publisher: Elsevier
ISBN: 1782422633
Category : Technology & Engineering
Languages : en
Pages : 573

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Book Description
Semiconductor nanowires promise to provide the building blocks for a new generation of nanoscale electronic and optoelectronic devices. Semiconductor Nanowires: Materials, Synthesis, Characterization and Applications covers advanced materials for nanowires, the growth and synthesis of semiconductor nanowires—including methods such as solution growth, MOVPE, MBE, and self-organization. Characterizing the properties of semiconductor nanowires is covered in chapters describing studies using TEM, SPM, and Raman scattering. Applications of semiconductor nanowires are discussed in chapters focusing on solar cells, battery electrodes, sensors, optoelectronics and biology. - Explores a selection of advanced materials for semiconductor nanowires - Outlines key techniques for the property assessment and characterization of semiconductor nanowires - Covers a broad range of applications across a number of fields

Author:
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Category :
Languages : en
Pages : 0

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Chiral magnetic materials exhibit a wide array of exotic spin configurations that are incommensurate with the underlying crystal lattice and their formation results from the competition of ferromagnetic exchange interactions and weaker Dzyaloshinskii-Moriya spin-orbit interactions. One recently revealed configuration for the B20-structure type, known as a "skyrmion," is a topologically non-trivial vortex-like magnetic domain. Skyrmion domains have become of great interest for applications in future magnetic memory storage devices since they can be manipulated as particle-like entities with remarkably low electrical currents. A major question is how the formation and current-induced dynamics of skyrmion domains are affected by the nanoscale dimensions required for such applications, and we have developed several characterization techniques to address the electrical and magnetic properties of the two silicide nanowire systems, MnSi and Fe1-xCoxSi that both have the B20-structure type. We have first observed skyrmion domains in a focus ion-beam thinned MnSi nanowire specimen using Lorentz transmission electron microscopy, and we identified that the skyrmion lattice phase is stable under small applied magnetic fields between the temperatures of 6 K and 35 K. We then developed a novel Hall effect measurement method for nanowires that we used to identify the topological Hall effect which is the electrical signature of magnetic skyrmion domains. These topological Hall effect measurements reveal that the skyrmion phase is stable in pristine MnSi nanowires between 15 K and 35 K which is a significantly larger temperature window compared to the skyrmion lattice in bulk MnSi crystals (only observed between 27 K and 29.5 K). Finally, we have measured the spin polarization of conduction electrons (which can have a significant impact on the magnitude of the topological Hall effect) in Fe1-xCoxSi nanowires using Andreev reflection spectroscopy implemented with a superconducting heterojunction.

Author: Paola Prete
Publisher: IntechOpen
ISBN: 9789537619794
Category : Science
Languages : en
Pages : 428

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Book Description
This volume is intended to orient the reader in the fast developing field of semiconductor nanowires, by providing a series of self-contained monographs focusing on various nanowire-related topics. Each monograph serves as a short review of previous results in the literature and description of methods used in the field, as well as a summary of the authors recent achievements on the subject. Each report provides a brief sketch of the historical background behind, the physical and/or chemical principles underlying a specific nanowire fabrication/characterization technique, or the experimental/theoretical methods used to study a given nanowire property or device. Despite the diverse topics covered, the volume does appear as a unit. The writing is generally clear and precise, and the numerous illustrations provide an easier understanding of the phenomena described. The volume contains 20 Chapters covering altogether many (although not all) semiconductors of technological interest, starting with the IV-IV group compounds (SiC and SiGe), carrying on with the binary and ternary compounds of the III-V (GaAs, AlGaAs, GaSb, InAs, GaP, InP, and GaN) and II-VI (HgTe, HgCdTe) families, the metal oxides (CuO, ZnO, ZnCoO, tungsten oxide, and PbTiO3), and finishing with Bi (a semimetal).

Author: Yi-Ching Ou
Publisher:
ISBN:
Category : Science
Languages : en
Pages :

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Characterization of Room-Temperature Ferromagnetic Zn1-xCoxO Nanowires.

Author: Usha Philipose
Publisher:
ISBN: 9780494399774
Category :
Languages : en
Pages : 376

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This thesis describes a catalytic growth approach to synthesize semiconductor nanowires with good control over their physical dimensions, chemical composition, and optical/electronic properties. Using the Vapour-Liquid-Solid growth mechanism, gold nanoclusters serve as the catalytic sites directing the growth of crystalline Zinc Selenide (ZnSe), Zinc Oxide (ZnO) and Zinc Sulphide (ZnS) nanowires with length of several microns and diameters varying from 15 nm to 100 nm. The effect of doping of these nanowires with transition elements such as manganese (Mn) has been studied. In this effort, the first successful attempt at synthesizing room temperature ferromagnetic nanowires has been realized. Above room temperature ferromagnetism has been observed for the first time in dilute Mn-doped crystalline ZnO nanowires. From the observed saturation magnetization, the magnetic moment per Mn atom is estimated to be in the range of 0.3 muB to 1.2 microB. The results of this thesis demonstrate that II-VI semiconductor nanowires such as ZnSe and ZnO can function as nanoscale devices and are promising for important applications in optoelectronic and spintronic devices. Electrical transport studies on an array of ZnSe nanowires confirm that there exists a non-uniform carrier distribution along the nanowires leading to 'super-linear' current-voltage behaviour with carrier mobilities comparable to that of bulk material. Photoconductivity measurements on ZnSe nanoribbons show that they are of good quality, enabling realization of a nanoscale photodetector with a peak efficiency of 43%. Spectral response of photoconductivity had a threshold character with edge corresponding to the ZnSe bandgap, which makes it an ideal candidate for blue and ultraviolet light detection. The morphology and properties of the nanowires were found to be strongly dependent on growth conditions. Optical characterization by photoluminescence spectroscopy show that the spectra is dominated by near band edge emission for low defect density nanowires in contrast to the high level of defect related emission from high defect density nanowires. The growth parameters were optimized leading to the synthesis of nanowires with minimum defect concentration.

Author: Zongyu Huang
Publisher: CRC Press
ISBN: 1000562840
Category : Science
Languages : en
Pages : 166

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Monoelemental 2D materials called Xenes have a graphene-like structure, intra-layer covalent bond, and weak van der Waals forces between layers. Materials composed of different groups of elements have different structures and rich properties, making Xenes materials a potential candidate for the next generation of 2D materials. 2D Monoelemental Materials (Xenes) and Related Technologies: Beyond Graphene describes the structure, properties, and applications of Xenes by classification and section. The first section covers the structure and classification of single-element 2D materials, according to the different main groups of monoelemental materials of different components and includes the properties and applications with detailed description. The second section discusses the structure, properties, and applications of advanced 2D Xenes materials, which are composed of heterogeneous structures, produced by defects, and regulated by the field. Features include: Systematically detailed single element materials according to the main groups of the constituent elements Classification of the most effective and widely studied 2D Xenes materials Expounding upon changes in properties and improvements in applications by different regulation mechanisms Discussion of the significance of 2D single-element materials where structural characteristics are closely combined with different preparation methods and the relevant theoretical properties complement each other with practical applications Aimed at researchers and advanced students in materials science and engineering, this book offers a broad view of current knowledge in the emerging and promising field of 2D monoelemental materials.

Author: Devesh Kumar Avasthi
Publisher: Springer Science & Business Media
ISBN: 9400712294
Category : Science
Languages : en
Pages : 292

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Ion beams have been used for decades for characterizing and analyzing materials. Now energetic ion beams are providing ways to modify the materials in unprecedented ways. This book highlights the emergence of high-energy swift heavy ions as a tool for tailoring the properties of materials with nanoscale structures. Swift heavy ions interact with materials by exciting/ionizing electrons without directly moving the atoms. This opens a new horizon towards the 'so-called' soft engineering. The book discusses the ion beam technology emerging from the non-equilibrium conditions and emphasizes the power of controlled irradiation to tailor the properties of various types of materials for specific needs.

Author: David Jiles
Publisher: CRC Press
ISBN: 148223890X
Category : Science
Languages : en
Pages : 512

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Book Description
A long overdue update, this edition of Introduction to Magnetism and Magnetic Materials is a complete revision of its predecessor. While it provides relatively minor updates to the first two sections, the third section contains vast updates to reflect the enormous progress made in applications in the past 15 years, particularly in magnetic recordin