Download or read book Growth and characterization of diluted magnetic semiconductors written by Dwight D. Hunter and published by . This book was released on 2005 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth and Characterization of Magnetic Nanostructures and Diluted Magnetic Semiconductors written by 陳淑芳 and published by . This book was released on 2010 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Novel Diluted Magnetic Semiconductors in the I III VI2 Family written by James T. Kelliher and published by . This book was released on 1990 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth and Characterization of Mn Doped GaN and AlGaN Dilute Magnetic Semiconductors written by Erkan Acar Berkman and published by . This book was released on 2004 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: GaMnN, ferromagnetism, dilute magnetic semiconductor, AlGaN, AlGaMnN, Mn doping, GaN.

Download or read book Growth and Characterization of Chromium Doped Indium Oxide Diluted Magnetic Semiconductors written by Ndubuisi Benjamin Ukah and published by . This book was released on 2009 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Diluted Magnetic Semiconductors written by Mukesh Kumar Jain and published by World Scientific. This book was released on 1991 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review volume presents both basic and applied aspects of diluted magnetic semiconductors (DMS). The term DMS applies generally to semiconductors in which a fraction of its constituent ions are replaced by magnetic ions. This book is only the second to review DMS materials. It presents a detailed treatment of the current state of knowledge of the established properties of DMS in the form of single crystals, quantum wells and superlattices. It also brings together recent work on new DMS materials and presents discussions on a wide range of possible DMS applications.

Download or read book Characterization of Diluted Magnetic Semiconductors for Spintronics Applications written by Xiaoyu Zhou and published by . This book was released on 2007 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Semimagnetic Semiconductors and Diluted Magnetic Semiconductors written by M. Averous and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semimagnetic semiconductors (SMSC) and diluted magnetic semiconductors (DMS) have in the past decade attracted considerable attention because they confer many new physical properties on both bulk materials and heterostructures. These new effects are due either to exchange interactions between magnetic moments on magnetic ions, or to exchange interactions between magnetic moments and the spin of the charge carrier. These effects vary with the transition metal (Mn, Fe, Co) or rare earth (Eu, Gd, etc) used and thus provide a range of different situations. The field is very large (zero gap, small gap, wide gap), and the magnetic properties also are very rich (paramagnetic spin glass, antiferromagnetism). These materials are very convenient for studying the magnetism (the magnetism is diluted) or the superlattices (SL) with a continuous change from type II SL to type III SL. This Course attempted to provide a complete overview of the topic. The participants of this summer school held in Erice came from ten countries and were from various backgrounds and included theoreticians, experimentalists, physicists, and chemists. Consequently, an attempt was made to make the Course as thorough as possible, but at the same time attention was devoted to basic principles. The lecturers, drawn from all the groups in the world involved in the field, were asked to be very didactic in their presentation. After two introductory lectures, Dr.

Download or read book Growth and Characterization of Mn Doped GaN and AlGaN Dilute Magnetic Semiconductors written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Growth of dilute magnetic semiconductors GaMnN and AlGaMnN showing ferromagnetic behavior above room temperature was achieved. Two approaches were used for Mn doping. GaMnN films were grown by MOCVD using (EtCp2)Mn as the precursor for in-situ Mn doping, while AlGaMnN samples were grown by post growth solid state Mn diffusion into MOCVD grown AlGaN films. Curie temperatures of the GaMnN films ranged from 270 to above 400K depending on Mn concentration. This dependence of Curie temperature on Mn concentration indicates that the GaMnN films are random solid solutions. Ferromagnetic behavior for these films were observed along c-direction (out of plane orientation) in a Mn concentration range of 0.025-0.25%. The saturation magnetizations ranged between 0.18 and 1.0 emu/cc, fairly high values considering the low levels of Mn doping. SQUID measurements ruled out the possibility of spin-glass and superparamagnetism in these MOCVD grown GaMnN films. Structural characterizations of the GaMnN films were achieved by XRD, SIMS and TEM measurements. XRD and TEM confirmed that the films were single crystal solid solutions without the presence of secondary phases. SIMS revealed that Mn was incorporated homogeneously throughout the GaMnN layer. The samples were highly resistive to be characterized by Hall measurement; however PL measurements showed that the samples were optically active. For the AlGaMnN films, SQUID and VSM measurements on several samples revealed ferromagnetism above room temperature. SQUID measurements on 30%AlN sample determined a Curie temperature of 320K and confirmed the absence of superparamagnetism. SIMS verified the diffusion of Mn into the AlGaN lattice, and XRD showed no sign of secondary phases. However TEM is necessary to rule out the presence of secondary phases. This study showed that the growth of III-Nitride films doped with Mn require special growth conditions to achieve ferromagnetism above room temperature, and the grown films do not have to be.

Download or read book Growth Characterization and Properties of Ultrathin Magnetic Films and Multilayers Materials Research Society Symposium Proceedings written by and published by . This book was released on 1990 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This symposium comprised 11 invited talks and 42 contributed papers, ran over 3 1/2 days, and provided a unique and interactive forum in which recent advances in low dimensional magnetism, diluted magnetic semiconductors, epitaxial overlayers and the utilization of in-situ and ex-situ techniques to characterized their microstructure, electronic and magnetic properties were discussed. The study and growth of ultrathin magnetic structures is a rapidly expanding filed of materials research whose growth is synergistically driven by an increasing appreciation of the degree to which the magnetic properties depend on interfacial processes, and by the utilization of growth techniques which permit the fabrication of multilayer structures with novel electronic and magnetic properties. Equally important is the fact that atomic level control of the microstructure of these layers offers new opportunities to elucidate the physics of magnetism and to rigorously test theoretical models.

Download or read book Growth and Characterization of III V Based Magnetic Semiconductor Structures written by Johan Adell and published by . This book was released on 2007 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth and Characterization of Magnetic Semiconductors GeMn written by Lorenzo Morresi and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book First Principle Vs Experimental Design of Diluted Magnetic Semiconductors written by Omar Mounkachi and published by Nova Science Publishers. This book was released on 2018-10 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent discoveries have given rise to a new class of electronics known as "spin electronics or spintronics," which uses the electron spin rather than its charge to create polarized currents. Spintronics is currently experiencing an extraordinary development with the manufacture of nanoscale devices based on ferromagnetic materials and semiconductors. Their applications are numerous, ranging from recording, electronics, and optoelectronics to quantum information. Spintronics is a new generation of electronics that has brought and continues to bring a lot of progress to information storage; this is due to the discovery of new materials with new functionalities and multiple applications. The discovery of giant magnetoresistance (GMR) in 1988 by Albert Fert and Peter Grünberg (receiver of the Nobel Prize in Physics in 2007) is considered a starting point of spintronics. GMR is based on the variation of the electric current in the presence of a magnetic field. The spintronics has made important contributions to the miniaturization desired for electronics; it uses nanometric components for processing and storing information. However, the limits of miniaturization on a nanometric scale are known, and it is imperative to develop new ways and new materials to exceed those limits. The most desired properties for these materials are high spin polarization, modular magnetic properties by an electric field and a long lifetime of the spin polarization. Among the new promising materials, we cite the following: Diluted magnetic semiconductors, which give new magnetic properties of conventional semiconductors, functional oxides (including the semi-metals and multiferroic metals) and organic semiconductors. The main theoretical challenge in this area is to understand how the macroscopic magnetic behavior observed results from interactions of a large number of degrees of microscopic freedom. In these systems the disorder is an essential parameter of magnetic phenomena, and due to random locations of impurity atoms it can lead to a total physical difference from the observed absence. There has been considerable recent advances in the design of these materials as diluted magnetic semiconductors (DMS, or diluted magnetic semiconductors), and a number of semiconductors were investigated as II-VI group and III-V group doped compounds, with transition metals substituting their original cations. There are several different theoretical approaches to study these magnetic materials. The ab-initio approach starts from the Schrödinger equation to simulate a given material. Such an approach is essential to determine the parameters and microscopic properties of such a system. In this book, the authors analyzed the electronic structure of magnetic semiconductors diluted in the case of ZnO, GaN, SnO2, TiO2, MgH2, EuO and EuN doped RENs (RE=GdN, DyN and HoN). The authors focused on magnetic, optical and exchange mechanisms which control the ferromagnetism in these systems. The purpose of this book is to propose some ideas to answer the most important question in material science for semiconductor spintronics, primarily considering how room-temperature ferromagnetism in DMS can be realized. Additionally, the correlation between first principle and experimental design to see how properties of yet-to-be-synthesized materials can be predicted is discussed.

Download or read book Semiconductor Heteroepitaxy Growth Characterization And Device Applications written by B Gil and published by World Scientific. This book was released on 1995-12-15 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book develops the mathematics of differential geometry in a way more intelligible to physicists and other scientists interested in this field. This book is basically divided into 3 levels; level 0, the nearest to intuition and geometrical experience, is a short summary of the theory of curves and surfaces; level 1 repeats, comments and develops upon the traditional methods of tensor algebra analysis and level 2 is an introduction to the language of modern differential geometry. A final chapter (chapter IV) is devoted to fibre bundles and their applications to physics. Exercises are provided to amplify the text material.

Download or read book Dilute Magnetic Semiconducting DMS Materials written by R. Saravanan and published by Materials Research Forum LLC. This book was released on 2018-08-25 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diluted Magnetic Semiconductors (DMS) play a vital role in modern electronics industry. It is important to understand the fundamental properties of these materials in order to apply them to their full potential. This book presents an analysis of the charge density distribution and other properties of some silicon and germanium based diluted magnetic semiconductors. A quantitative analysis of the charge density distribution has been done in order to obtain measurements of the charges involved in the bonding, which are decisive for the physical and chemical properties of the DMS materials. Also, the local structures of the materials have been analyzed by studying their powder X-ray diffraction intensities. Analysis of the magnetic properties of the DMS materials is mandatory and has been accomplished by magnetic measurements carried out using a vibrating sample magnetometer. The morphology of the DMS materials has been studied using scanning electron micrographs.

Download or read book Coopertive Research Associateships Tenable at the Naval Research Laboratory Washington written by and published by National Academies. This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Diluted Magnetic Semiconductors written by Mukesh Jain and published by World Scientific. This book was released on 1991-10-31 with total page 677 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review volume presents both basic and applied aspects of diluted magnetic semiconductors (DMS). The term DMS applies generally to semiconductors in which a fraction of its constituent ions are replaced by magnetic ions. This book is only the second to review DMS materials. It presents a detailed treatment of the current state of knowledge of the established properties of DMS in the form of single crystals, quantum wells and superlattices. It also brings together recent work on new DMS materials and presents discussions on a wide range of possible DMS applications.