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Author : Shengqiang Zhou
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (277 download)
Download or read book Transition Metal Implanted ZnO written by Shengqiang Zhou and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (652 download)
Download or read book Transition Metal Implanted ZnO: a Correlation Between Structure and Magnetism written by and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays ferromagnetism is often found in potential diluted magnetic semiconductor systems. However, many authors question the origin of this ferromagnetism, i.e. if the observed ferromagnetism stems from ferromagnetic precipitates rather than from carriermediated magnetic coupling of ionic impurities, as required for a diluted magnetic semiconductor. In this thesis, this question will be answered for transition-metal implanted ZnO single crystals. Magnetic secondary phases, namely metallic Fe, Co and Ni nanocrystals, are formed inside ZnO. They are - although difficult to detect by common approaches of structural analysis - responsible for the observed ferromagnetism. Particularly Co and Ni nanocrystals are crystallographically oriented with respect to the ZnO matrix. Their structure phase transformation and corresponding evolution of magnetic properties upon annealing have been established. Finally, an approach, pre-annealing ZnO crystals at high temperature before implantation, has been demonstrated to sufficiently suppress the formation of metallic secondary phases.
Author : Deirdre McCabe
Publisher :
ISBN 13 :
Total Pages : 163 pages
Book Rating : 4.:/5 (822 download)
Download or read book Photoluminescence of ZnO written by Deirdre McCabe and published by . This book was released on 2007 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brian P. Feller
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.:/5 (672 download)
Download or read book Optical Investigation of Transition Metal Implanted Wide Band Gap Semiconductors written by Brian P. Feller and published by . This book was released on 2005 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lanlan Zou
Publisher : Open Dissertation Press
ISBN 13 : 9781361308837
Total Pages : pages
Book Rating : 4.3/5 (88 download)
Download or read book Annealing Studies on the Structural and Magnetical Properties of Co Implanted Zno Single Crystal written by Lanlan Zou and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Annealing Studies on the Structural and Magnetical Properties of Co Implanted ZnO Single Crystal" by Lanlan, Zou, 邹兰兰, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: As a wide band gap semiconductor, Zinc Oxide (ZnO) has recently attracted considerable attention due to its wide applicability. Transition metal (TM) doped ZnO is one of the most intensive research field in the last decade because of its possible application in spintronics devices. The Co-implanted ZnO has been considered as one of the most promising candidate in the field of diluted magnetic semiconductor (DMS). In this study, the magnetic and structural properties of Co-implanted ZnO single crystal were investigated. ZnO single crystals were implanted with 100 keV-Co ions at 300K with a fluence of 1014cm-2and subsequently annealed at 750oC and 900oC respectively. The samples were studied by secondary ion mass spectrometry, X-ray diffraction, photoluminescence, X-ray photoemission spectroscopy and vibrating sample magnetometer. The as-implanted sample seemed to be phase pure while the spinel secondary phase ZnCo2O4 was present in 750oC and 900oC samples showed trace ofCo3O4, Zn0.52Co2.48O4 and metallic Co cluster. All the samples exhibited ferromagnetism at room temperature in low field region, and the magnetic moment was found to decrease and increase after the heat treatment. In high field region, typical paramagnetism was the dominating magnetic property. More than one ferromagnetic mechanism is involved to explain the experimental results. DOI: 10.5353/th_b4979969 Subjects: Zinc oxide Annealing of crystals
Author : Sven Müller
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (552 download)
Download or read book Structural and Optical Impact of Transition Metal Implantation Into Zinc Oxide Single Crystals and Nanowires written by Sven Müller and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Venkaiah Malapati
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659588426
Total Pages : 196 pages
Book Rating : 4.5/5 (884 download)
Download or read book Structure and Properties of 3d Transition Metal Doped ZnO written by Venkaiah Malapati and published by LAP Lambert Academic Publishing. This book was released on 2014-08-27 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: ZnO based semiconductors as transparent electrodes have given wide range of applications in optoelectronic devices due to their wide band gap replacing the conventional GaN semiconductors. This book is the compilation of the work of Venkaiah Malapati which deals with the synthesis and characterization of an interesting room temperature undoped and 3d transition metal doped ZnO thin films by rf magnetron sputtering. this work addresses the following three major questions... (1) what is the effect of working gas pressure on the properties of undoped and Mn, Fe and Mn-Fe co-doped ZnO thin films. Here, the effect of argon and oxygen gas pressure studied undoped and Mn and Fe doped thin films studied. This book includes a systematic study of structure, morphology, optical, mechanical and magnetic properties of undoped Mn, Fe doped ZnO thin films studied. This book should be useful to readers in enhancing their knowledge about thin film preparation and their characterization.
Author :
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (227 download)
Download or read book Transition Metal Doped ZnO for Spintronics written by and published by . This book was released on 2007 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this project, the properties of transition metal (TM) -doped ZnO will be investigated. The project focuses on two activities. First, the properties of ZnO doped with transition metals (Mn, Co, or Cr) and deep level impurities (Cu, As, Sn) is explored. The primary interest will be on elucidating the origin of magnetism in the TM-doped material, including understanding the role of deep level co-dopants in mediating ferromagnetism. Experiments will focus on correlating magnetic properties (Curie temperature, moment/TM dopant) with the TM and deep level dopant concentrations. Epitaxial film growth and ion implantation of single crystals will be used in these studies. Second, for the dilute magnetic semiconducting compounds, there appears to be a correlation of Curie temperature with semiconductor bandgap. In an effort to increase the Curie temperature to greater than 300 K, the properties of TM-doped (Zn, Mg)O will also be investigated, as the addition of Mg to ZnO increases the bandgap. The epitaxial films will be grown by pulsed-laser deposition. Temperature-dependent Hall and resistivity measurements will be used to determine conduction mechanisms, carrier type, and doping. SQUID magnetometry will be used to characterize the magnetic properties of transition metal doped materials.
Author : B. Babu
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659255304
Total Pages : 136 pages
Book Rating : 4.2/5 (553 download)
Download or read book Transition Metal Ions Doped Zno Nanopowders written by B. Babu and published by LAP Lambert Academic Publishing. This book was released on 2015-02-16 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intensive research on semiconductor nanomaterials has increased remarkably during the past years due to their unique characteristics. Wide-band gap oxide semiconductors have occupied the forefront because of an increasing need for short wavelength photonic devices, high-power, high-frequency electronic devices. Doping with proper metal elements via introducing acceptor or donor in host material is an effective approach to tune the materials with requisite properties. Among different magnetic semiconductor materials, 3d transition metal doped ZnO has received maximum attention due to the observation of room temperature ferromagnetism with suitable magnetic dopant ions. Therefore, selection of proper doping element in ZnO has become an important route for enhancing and controlling electrical, optical and magnetic performances of nanomaterials. The objective of the present investigation is to synthesis, structural, spectroscopic and magnetic properties of transition metal ions doped ZnO nanopowders by solid state reaction with sonochemical assistance. The synthesized powders are characterized by XRD, SEM, Optical absorption, PL, FT-IR, EPR and VSM techniques.
Author : John Vedamuthu Kennedy
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.F/5 ( download)
Download or read book Implantation of Acceptor Ions Into ZnO Crystals written by John Vedamuthu Kennedy and published by . This book was released on 2006 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sajid Husain
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659473401
Total Pages : 76 pages
Book Rating : 4.4/5 (734 download)
Download or read book Transition Metal Doped ZnO:Synthesis Structural and Optical Properties written by Sajid Husain and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will provide a good understanding to readers about the chemical synthesis process of un-doped and doped ZnO nanoparticles. The various characterization has been done which emphasize to optoelectronic application on the basis of band gap tuning. And it has an immense application in DMS materials also. The additional information includes in the APPENDICES-A & B which might be useful for synthesis and the energy band gap calculation with theoretical reference.
Author :
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.3/5 (91 download)
Download or read book Recent Progress in Processing and Properties of ZnO written by and published by . This book was released on 2005 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Boris Ildusovich Kharisov
Publisher : CRC Press
ISBN 13 : 1466505230
Total Pages : 586 pages
Book Rating : 4.4/5 (665 download)
Download or read book Radiation Synthesis of Materials and Compounds written by Boris Ildusovich Kharisov and published by CRC Press. This book was released on 2016-04-19 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers and engineers working in nuclear laboratories, nuclear electric plants, and elsewhere in the radiochemical industries need a comprehensive handbook describing all possible radiation-chemistry interactions between irradiation and materials, the preparation of materials under distinct radiation types, the possibility of damage of material
Author : P. C. Chang
Publisher : The Electrochemical Society
ISBN 13 : 9781566774628
Total Pages : 500 pages
Book Rating : 4.7/5 (746 download)
Download or read book State-of-the-Art Program on Compound Semiconductors : (SOTAPOCS XLII) and Processes at the Compound-Semiconductor/Solution Interface written by P. C. Chang and published by The Electrochemical Society. This book was released on 2005 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Parmod Kumar
Publisher : Springer Nature
ISBN 13 : 303093862X
Total Pages : 68 pages
Book Rating : 4.0/5 (39 download)
Download or read book Ion Beam Induced Defects and Their Effects in Oxide Materials written by Parmod Kumar and published by Springer Nature. This book was released on 2022-02-23 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of the applications of ion beam techniques in oxide materials. Oxide materials exhibit defect-induced physical properties relevant to applications in sensing, optoelectronics and spintronics. Defects in these oxide materials also lead to magnetism in non-magnetic materials or to a change of magnetic ordering in magnetic materials. Thus, an understanding of defects is of immense importance. To date, ion beam tools are considered the most effective techniques for producing controlled defects in these oxides. This book will detail the ion beam tools utilized for creating defects in oxides.
Author : Chennupati Jagadish
Publisher : Elsevier Science
ISBN 13 : 9781483299679
Total Pages : 600 pages
Book Rating : 4.2/5 (996 download)
Download or read book Zinc Oxide Bulk, Thin Films and Nanostructures: Processing, Properties, and Applications written by Chennupati Jagadish and published by Elsevier Science. This book was released on 2006-09 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: With an in-depth exploration of the following topics, this book covers the broad uses of zinc oxide within the fields of materials science and engineering: - Recent advances in bulk, thin film and nanowire growth of ZnO (including MBE, MOCVD and PLD), - The characterization of the resulting material (including the related ternary systems ZgMgO and ZnCdO), - Improvements in device processing modules (including ion implantation for doping and isolation, Ohmic and Schottky contacts, wet and dry etching), - The role of impurities and defects on materials properties - Applications of ZnO in UV light emitters/detectors, gas, biological and chemical-sensing, transparent electronics, spintronics and thin film
Author : Parmod Kumar
Publisher : Elsevier
ISBN 13 : 0323909086
Total Pages : 738 pages
Book Rating : 4.3/5 (239 download)
Download or read book Defect-Induced Magnetism in Oxide Semiconductors written by Parmod Kumar and published by Elsevier. This book was released on 2023-05-26 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt: Defect-Induced Magnetism in Oxide Semiconductors provides an overview of the latest advances in defect engineering to create new magnetic materials and enable new technological applications. First, the book introduces the mechanisms, behavior, and theory of magnetism in oxide semiconductors and reviews the methods of inducing magnetism in these materials. Then, strategies such as pulsed laser deposition and RF sputtering to grow oxide nanostructured materials with induced magnetism are discussed. This is followed by a review of the most relevant postdeposition methods to induce magnetism in oxide semiconductors including annealing, ion irradiation, and ion implantation. Examples of defect-induced magnetism in oxide semiconductors are provided along with selected applications. This book is a suitable reference for academic researchers and practitioners and for people engaged in research and development in the disciplines of materials science and engineering. Reviews the magnetic, electrical, dielectric and optical properties of oxide semiconductors with defect-induced magnetism Discusses growth and post-deposition strategies to grow oxide nanostructured materials such as oxide thin films with defect-induced magnetism Provides examples of materials with defect-induced magnetism such as zinc oxide, cerium dioxide, hafnium dioxide, and more
