Spin-dependent Hot Electron Transport and Manoscale Magnetic Imaging of Metal/Si Structures PDF Download
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Author: Andreas Kaidatzis
Publisher:
ISBN:
Category :
Languages : en
Pages : 141
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Book Description
In this work, we experimentally study spin-dependent hot electron transport through metallic multilayers (ML), containing single magnetic layers or "spin-valve" (SV) trilayers. For this purpose, we have set up a ballistic electron emission microscope (BEEM), a three terminal extension of scanning tunnelling microscopy on metal/semiconductor structures. The implementation of the BEEM requirements into the sample fabrication is described in detail. Using BEEM, the hot electron transmission through the ML's was systematically measured in the energy range 1-2 eV above the Fermi level. By varying the magnetic layer thickness, the spin-dependent hot electron attenuation lengths were deduced. For the materials studied (Co and NiFe), they were compared to calculations and other determinations in the literature. For sub-monolayer thickness, a non uniform morphology was observed, with large transmission variations over sub-nanometric distances. This effect is not yet fully understood. In the imaging mode, the magnetic configurations of SV's were studied under field, focussing on 360° domain walls in Co layers. The effects of the applied field intensity and direction on the DW structure were studied. The results were compared quantitatively to micromagnetic calculations, with an excellent agreement. From this, it can be shown that the BEEM magnetic resolution is better than 50 mn.
Author: Andreas Kaidatzis
Publisher:
ISBN:
Category :
Languages : en
Pages : 141
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Book Description
In this work, we experimentally study spin-dependent hot electron transport through metallic multilayers (ML), containing single magnetic layers or "spin-valve" (SV) trilayers. For this purpose, we have set up a ballistic electron emission microscope (BEEM), a three terminal extension of scanning tunnelling microscopy on metal/semiconductor structures. The implementation of the BEEM requirements into the sample fabrication is described in detail. Using BEEM, the hot electron transmission through the ML's was systematically measured in the energy range 1-2 eV above the Fermi level. By varying the magnetic layer thickness, the spin-dependent hot electron attenuation lengths were deduced. For the materials studied (Co and NiFe), they were compared to calculations and other determinations in the literature. For sub-monolayer thickness, a non uniform morphology was observed, with large transmission variations over sub-nanometric distances. This effect is not yet fully understood. In the imaging mode, the magnetic configurations of SV's were studied under field, focussing on 360° domain walls in Co layers. The effects of the applied field intensity and direction on the DW structure were studied. The results were compared quantitatively to micromagnetic calculations, with an excellent agreement. From this, it can be shown that the BEEM magnetic resolution is better than 50 mn.
Author: Sadamichi Maekawa
Publisher: CRC Press
ISBN: 9781420024579
Category : Technology & Engineering
Languages : en
Pages : 296
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Book Description
In magnetic systems of nano-meter size, the interplay between spin and charge of electrons provides unique transport phenomena. In magnetic superlattices, magnetic and non-magnetic metallic thin films with thickness of the order of one nano-meter are piled-up alternately. Since the discovery of giant magnetoresistance (GMR) in these superlattices in 1988, spin dependent transport phenomena in magnetic nanostructures have received much attention from both academic and technological points of view. Ferromagnetic tunnel junctions made of ferromagnetic metal electrodes and a very thin insulating barrier between them are also of current interest as magnetoresistive devices, where the tunneling current depends on the relative orientation of magnetization (TMR). In addition to magnetic superlattices and magnetic tunnel junctions, magnetic granular systems and magnetic dots have been studied extensively as magnetoresistive systems. Edited by two of the world's leading authorities, Spin Dependent Transport in Magnetic Nanostructures introduces and explains the basic physics and applications of a variety of spin-dependent transport phenomena in magnetic nanostructures with particular emphasis on magnetic multilayers and magnetic tunnel junctions.
Author: Michael Joseph Gomez
Publisher:
ISBN: 9781085777711
Category : Heat
Languages : en
Pages : 85
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Book Description
The goal of this work is to understand spin and heat transfer in metal multilayer systems on nanoscale length scales and ultra-fast time scales due to ultra-fast laser pulse heating. Femto-second laser pulses are absorbed at the surface of the metal system. The absorbed energy is deposited in the metal's electrons. Energy is then redistributed to vibrational and spin degrees of freedom through electron-electron, electron-phonon, and phonon-phonon interactions. Energy is also dispersed spatially through hot electron transport. The heat transfer in these metal systems can be divided into two temporal regimes with the first spanning from 0 to 1ps and the second from 1ps to 12.5ns
Author: Evgeny Y. Tsymbal
Publisher: CRC Press
ISBN: 1439803781
Category : Science
Languages : en
Pages : 797
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Book Description
In the past several decades, the research on spin transport and magnetism has led to remarkable scientific and technological breakthroughs, including Albert Fert and Peter Grunberg's Nobel Prize-winning discovery of giant magnetoresistance (GMR) in magnetic metallic multilayers. Handbook of Spin Transport and Magnetism provides a comprehensive, bal
Author: Damien Alloyeau
Publisher: Springer Science & Business Media
ISBN: 1447140141
Category : Technology & Engineering
Languages : en
Pages : 415
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Book Description
Bimetallic nanoparticles, also called nanoalloys, are at the heart of nanoscience because of their ability to tune together composition and size for specific purposes. By approaching both their physical and chemical properties, Nanoalloys: Synthesis, Structure & Properties provides a comprehensive reference to this research field in nanoscience by addressing the subject from both experimental and theoretical points of view, providing chapters across three main topics: Growth and structural properties Thermodynamics and electronic structure of nanoalloys Magnetic, optic and catalytic properties The growth and elaboration processes which are the necessary and crucial part of any experimental approach are detailed in the first chapter. Three chapters are focused on the widely used characterization techniques sensitive to both the structural arrangements and chemistry of nanoalloys. The electronic structure of nanoalloys is described as a guide of useful concepts and theoretical tools. Chapters covering thermodynamics begin with bulk alloys, going to nanoalloys via surfaces in order to describe chemical order/disorder, segregation and phase transitions in reduced dimension. Finally, the optical, magnetic and catalytic properties are discussed by focusing on nanoparticles formed with one element to track the modifications which occur when forming nanoalloys. The range and detail of Nanoalloys: Synthesis, Structure & Properties makes it an ideal resource for postgraduates and researchers working in the field of nanoscience looking to expand and support their knowledge of nanoalloys.
Author: A. S. Sahakyan
Publisher:
ISBN: 9781536103007
Category : SCIENCE
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 2668
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Publisher:
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Category : Aeronautics
Languages : en
Pages : 560
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Author: Kanak Kalita
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3111335534
Category : Technology & Engineering
Languages : en
Pages : 184
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Book Description
This book unravels the intriguing interplay between macroscopic manufacturing processes and microscopic fabrication techniques. It dives into the sophisticated world of precision manufacturing, where high accuracy, controlled processes enable the production of complex components and products. It covers micro and nano fabrication, which revolutionizes conventional manufacturing by creating minuscule yet highly functional parts, some even smaller than the width of a human hair. This book explores various topics, from precise machining techniques to nanoimprint technology, reflecting the vast breadth and depth of this field. The aim is to provide readers with a comprehensive understanding of how these micro and macro scales intertwine, opening new frontiers in manufacturing. By showcasing the latest research findings and their practical applications, this book elucidates the enormous potential and implications of this burgeoning field. The contents are laid out in a user-friendly manner to communicate complex ideas in an accessible, engaging way, making it a valuable resource for anyone curious about the next big leap in manufacturing technology.
Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 1014
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