Nanomagnetismus von epitaktischen Fe(110)- und CrO 2 (100)-Strukturen im Hinblick auf potentielle spinelektronische Anwendungen
type: CreativeWork
description: As a result of the continuously increasing demands on the information technology within the last years new concepts of data storage systems have been developed. The combination of electronic and magnetic properties within so called spinelectronic or magnetoelectronic devices plays a key role in this area of research and technology. With the development of magnetic random access memories and magnetic-field sensors based on submicron magnetic elements there is a great deal of interest in understanding and controlling the micromagnetism of such elements. Furthermore the performance of such devices can be drastically enhanced by high-spinpolarized ferromagnetic materials. In chapter 1 investigations of the nanomagnetism of submicron epitaxial Fe(110) elements are presented. Magnetic force microscopy (MFM) measurements in conjunction with micromagnetic simulations show that the reproducible generation of remanent single-domain states is suppressed by the imperfection of the elements edges or by magnetic or structural defects of the magnetic material.The preparation and characterization of thin epitaxial (100)-oriented chromium dioxide films are presented in chapter 2. Chromium dioxide belongs to the class of half-metallic ferromagnets that are – in addition to the ferromagnetic properties – characterized by a high degree of spin polarization. By using two different chemical vapour deposition techniques thin chromium dioxide films were epitaxially grown on titanium dioxide substrates. Solid chromium trioxide and liquid chromyl chloride were used as precursors for these processes. As a result of extensive characterization of the films properties via x-ray diffraction, atomic force and scanning tunneling microscopy, SQUID magnetometry, magnetooptical Kerr measurements, and spin resolved photoelectron spectroscopy, the surface roughness of the films has been drastically reduced. It is shown that the so prepared films exhibit a high spin polarization and a pronounced anisotro…
abstract: As a result of the continuously increasing demands on the information technology within the last years new concepts of data storage systems have been developed. The combination of electronic and magnetic properties within so called spinelectronic or magnetoelectronic devices plays a key role in this area of research and technology. With the development of magnetic random access memories and magnetic-field sensors based on submicron magnetic elements there is a great deal of interest in understanding and controlling the micromagnetism of such elements. Furthermore the performance of such devices can be drastically enhanced by high-spinpolarized ferromagnetic materials. In chapter 1 investigations of the nanomagnetism of submicron epitaxial Fe(110) elements are presented. Magnetic force microscopy (MFM) measurements in conjunction with micromagnetic simulations show that the reproducible generation of remanent single-domain states is suppressed by the imperfection of the elements edges or by magnetic or structural defects of the magnetic material.The preparation and characterization of thin epitaxial (100)-oriented chromium dioxide films are presented in chapter 2. Chromium dioxide belongs to the class of half-metallic ferromagnets that are – in addition to the ferromagnetic properties – characterized by a high degree of spin polarization. By using two different chemical vapour deposition techniques thin chromium dioxide films were epitaxially grown on titanium dioxide substrates. Solid chromium trioxide and liquid chromyl chloride were used as precursors for these processes. As a result of extensive characterization of the films properties via x-ray diffraction, atomic force and scanning tunneling microscopy, SQUID magnetometry, magnetooptical Kerr measurements, and spin resolved photoelectron spectroscopy, the surface roughness of the films has been drastically reduced. It is shown that the so prepared films exhibit a high spin polarization and a pronounced anisotro…
author: König, Christian
language: ger
keywords: info:eu-repo/classification/ddc/530, Physik, Ferromagnetismus, Magnetoelektronik, Spinelektronik, halbmetallischer Ferromagnet, magnetische Domänen, magnetoelectronic, spinelectronic, halfmetallic ferromagnet, magnetic domains
date published: 2006
date modified: 2026-07-30T19:43:10Z
provider: RWTH Aachen University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Publikationsserver der RWTH Aachen University