Download or read book Toward Spin resolved Scanning Tunneling Microscopy Using Carbon Nanotubes and Half metallic Ferromagnets written by Dirk Orgassa and published by . This book was released on 2001 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Towards magnetic resonance in scanning tunneling microscopy using heterodyne detection written by Peter, Moritz and published by KIT Scientific Publishing. This book was released on 2015-09-18 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work introduces a new concept for magnetic resonance measurements in the GHz regime inside a scanning tunneling microscope. It is based on heterodyne detection in a spin-polarized tunneling barrier. The experimental requirements, including a new method to suppress transmission effects, are explained. Measurements on three model systems which were studied to validate the new technique are presented and compared to simulations.
Download or read book Roadmap of Scanning Probe Microscopy written by Seizo Morita and published by Springer Science & Business Media. This book was released on 2006-12-30 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scanning tunneling microscopy has achieved remarkable progress and become the key technology for surface science. This book predicts the future development for all of scanning probe microscopy (SPM). Such forecasts may help to determine the course ultimately taken and may accelerate research and development on nanotechnology and nanoscience, as well as all in SPM-related fields in the future.
Download or read book Scanning Tunneling Microscopy written by H. Neddermeyer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: The publication entitled "Surface Studies by Scanning Tunneling Mi Rl croscopy" by Binnig, Rohrer, Gerber and Weibel of the IBM Research Lab oratory in Riischlikon in 1982 immediately raised considerable interest in the sur face science community. It was demonstrated in Reference R1 that images from atomic structures of surfaces like individual steps could be obtained simply by scanning the surface with a sharp metal tip, which was kept in a constant distance of approximately 10 A from the sample surface. The distance control in scanning tunneling microscopy (STM) was realized by a feedback circuit, where the electri cal tunneling current through the potential barrier between tip and sample is used for regulating the tip position with a piezoelectric xyz-system. A similar experi mental approach has already been described by Young et al. for the determination l of the macroscopic roughness of a surface. A number of experimental difficulties had to be solved by the IBM group until this conceptual simple microscopic method could be applied successfully with atomic resolution. Firstly, distance and scanning control of the tip have to be operated with sufficient precision to be sensitive to atomic structures. Secondly, sample holder and tunneling unit have to be designed in such a way that external vibrations do not influence the sample-tip distance and that thermal or other drift effects become small enough during measurement of one image.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Towards Magnetic Resonance in Scanning Tunneling Microscopy Using Heterodyne Detection written by Moritz Peter and published by . This book was released on 2020-10-09 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work introduces a new concept for magnetic resonance measurements in the GHz regime inside a scanning tunneling microscope. It is based on heterodyne detection in a spin-polarized tunneling barrier. The experimental requirements, including a new method to suppress transmission effects, are explained. Measurements on three model systems which were studied to validate the new technique are presented and compared to simulations. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Download or read book Scanning Probe Microscopy written by Roland Wiesendanger and published by Springer Science & Business Media. This book was released on 1998-04-16 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scanning Probe Microscopy - Analytical Methods provides a comprehensive overview of the analytical methods on the nanometer scale based on scanning probe microscopy and spectroscopy. Numerous examples of applications of the chemical contrast mechanism down to the atomic scale in surface physics and chemistry are discussed with extensive references to original work in the recent literature.
Download or read book Scanning Tunneling Microscopy and Spectroscopy of Single walled Carbon Nanotubes Directly Interfaced with Atomically Pristine Silicon Surfaces written by Peter Michael Albrecht and published by . This book was released on 2004 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scanning Tunneling Microscopy and Spectroscopy of Carbon Nanotubes Interfaced with Silicon Surfaces written by Peter Michael Albrecht and published by . This book was released on 2007 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-walled carbon nanotubes (SWNTs) are high-aspect-ratio molecular wires that exhibit either metallic or semiconducting behavior depending upon their diameter and chiral angle. SWNTs support high-mobility electrical conduction, are chemically and mechanically robust, and can both emit and detect infrared light. These properties recommend SWNTs as the building blocks of a future molecular nanotechnology. In the near term, however, the integration of SWNTs with silicon-based complementary metal-oxide-semiconductor (CMOS) technology holds the greatest promise in terms of economic and manufacturing feasibility. In this thesis, the ultrahigh vacuum scanning tunneling microscope (UHV-STM) is used to examine SWNTs directly interfaced with the hydrogen-passivated Si(100) surface. An approach termed dry contact transfer (DCT) was developed for the UHV deposition of SWNTs with minimal disruption of the atomically flat Si(100)-2x1:H surface. Isolated, rather than bundled, SWNTs could be routinely located on the surface for atomically resolved imaging, tunneling current-voltage spectroscopy, lateral manipulation, and cutting with the room-temperature UHV-STM. The removal of hydrogen at the nanotube-silicon interface via UHV-STM electron-stimulated desorption resulted in structural and electronic modifications to the SWNT. The growing body of first-principles simulations of the SWNT/Si(100) system was drawn upon in the interpretation of such local perturbations. Weakly adsorbed SWNTs initially unstable in the presence of the rastered STM tip could be stabilized by depassivating the underlying H-Si(100) surface. Finally, feedback-controlled cutting of SWNTs with the UHV-STM was demonstrated as a precise and reproducible means of preparing one or more finite-sized SWNTs from an extended tube.
Download or read book Resolution of Real space Images of Metallic Atoms by Scanning Tunneling Microscopy written by Yu Cheng Zheng and published by . This book was released on 1988 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improvement in Scanning Tunneling Microscopy and Carbon Nanotubes written by Samir Anil Shah and published by . This book was released on 2001 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spin polarized Scanning Tunneling Microscopy Studies of Topological Magnetism written by Jacob John Repicky and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As conventional electronics approach the physical limits of size and speed, desire for more capable and energy efficient technologies has driven studies of the individual and collective behavior of electron spins within solid state materials to achieve new forms of information processing. Recent developments in this field of spintronics have led to the discovery particle-like magnetic textures called magnetic skyrmions where spins are arranged in a swirling, vortex-like pattern. To advance the understanding of materials capable of stabilizing magnetic skyrmions and the mechanisms that govern their stability and dynamical properties, we use spin-polarized scanning tunneling microscopy. The research presented here builds on the connection between the physical and magnetic structure at the surface of materials. First, we observe novel surface structures and investigate the electronic and magnetic properties of Cr(001) and Fe/Ir(111), two systems that can be used to characterize the magnetic tip of the scanning tunneling microscope. Next, we detail a technique to determine the grain structure of B20-type magnetic materials FeGe and MnGe, where the structural chirality is known to determine the chirality of the magnetic textures. The surface termination, stacking order of the layered atomic lattice, and grain chirality can all be identified by analysis of the atomic corrugation and insights from density functional theory calculations. Finally, we observe novel topological spin textures at the surface of MnGe(111). The stabilization of these is correlated to structural deformation of the film, and their three-dimensional structure is deduced based on comparison of the spin-polarized imaging with micromagnetic simulations.
Download or read book Scanning Tunneling Microscopy and Spectroscopy of Porphyrins and Carbon Nanotubes written by Mark Alexander Bissett and published by . This book was released on 2007 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Scanning Tunneling Microscopy Study of Single walled Carbon Nanotubes on Gold written by Brinda K. Ramaiya and published by . This book was released on 2004 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scanning Tunneling Spectroscopy of Graphene and Magnetic Nanostructures written by Victor Watson Brar and published by . This book was released on 2010 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation is divided into two parts, both of which describe measurements where a scanning tunneling microscope (STM) is operated to perform measurements of novel physical systems. In the first section I describe spin-polarized STM (SP-STM) measurements on individual adatoms on a ferromagnetic surface. The aim of the first section is to illustrate how a SP-STM can be used to probe magnetic phenomena at the atomic scale. After describing the explicit details of the SP-STM apparatus, I explain how to use SP-STM to study the magnetic coupling of different 3d adatoms (Fe, Cr and Cu) to a ferromagnetic surface. It is shown that the SP-STM is capable of distinguishing which species couple ferromagnetically vs. anti-ferromagnetically to the surface. The second section describes STM measurements performed on a graphene surface equipped with a back-gate electrode that can be used to vary the charge density of the graphene in situ. These measurements represent the first time an STM has been capable of measuring a gate-tunable surface, and this section describes the extra experimental and theoretical considerations that are required to set up such an experiment and accurately interpret the data. It is shown that electrons tunneling into graphene include a strong, phononmediated inelastic signal, and that an STM tip can be an invasive probe of graphene. After showing how to account for these effects, STM experiments are presented that examine (1) how impurities effect the large scale electronic structure of graphene, (2) how the quasiparticle lifetime in graphene depends on charge density, and (3) how Co adatoms can be reversibly ionized on graphene through the use of a back-gate electrode.
Download or read book Scanning Tunneling Microscopy and Low Energy Electron Microscopy of Metal Overlayers on Metal Surfaces written by and published by . This book was released on 1995 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin metal films are of ever increasing importance as the scale of devices shrinks. In order to provide new insight into the atomic details of metal film structure and the nanoscopic details of magnetic domains, efforts were made to study thin metal films on tungsten single crystals using both scanning tunneling microscopy (STM) and spin polarized low energy electron microscopy (SPLEEM). Difficulties were encountered with the as-delivered SPLEEM instrument which required extensive efforts to rectify. STM investigators were directed towards understanding the structure of multilayer metal films on W(111) and Al2O3(0001). Atomic models for a number of different and complex surface structures are derived for Au films on W(l10) for coverages between 0.5 and 5 monolayers. STM studies of sputter deposited Pt films on sapphire substrates, for use as seed layers for epitaxial spin valves, are described. By varying the Pt layer thickness and deposition temperature, continuous epitaxial thin films were developed. An epitaxial spin valve was constructed and assessed by magneto-transport measurements. Future opportunities for improved understanding of magnetic and electrical phenomena in thin films are briefly described. p1.
