Origin of ferromagnetism in oxide-based diluted magnetic semiconductors

In the thesis, the structural, magnetic and electronic properties of TiO\(_{2}\) and ZnO-based DMS materials have been studied. There are two main purposes. One is to produce ferromagnetic semiconductors which have \(\it{T}\)\(_{c}\) values higher than room temperature. The second one is to shed some light on the origin of room temperature ferromagnetism whether it originates from clusters or from uniformly distributed magnetic cobalt atoms. In an attempt to fabricate ferromagnetic semiconductors, TiO\(_{2}\) rutile and ZnO samples are exposed to magnetic cobalt ions. Rutherford backscattering spectrometry, x-ray diffraction, atomic force microscopy, and transmission electron microscopy were used to obtain Co distribution profiles and to identify possible second phases in these systems. The magnetic properties of the implanted materials have been investigated using the magneto-optical Kerr effect, superconducting quantum interference device magnetometry, and x-ray resonant magnetic scattering techniques.

Metadaten
Author:	Numan Akdoğan GND
URN:	urn:nbn:de:hbz:294-21636
Referee:	Hartmut Zabel ORCiD GND, Kurt Westerholt GND
Document Type:	Doctoral Thesis
Language:	English
Date of Publication (online):	2008/03/06
Date of first Publication:	2008/03/06
Publishing Institution:	Ruhr-Universität Bochum, Universitätsbibliothek
Granting Institution:	Ruhr-Universität Bochum, Fakultät für Physik und Astronomie
Date of final exam:	2008/02/07
Creating Corporation:	Fakultät für Physik und Astronomie
GND-Keyword:	Magnetoelektronik; Magnetischer Halbleiter; Magnetischer Röntgenzirkulardichroismus; Titandioxid; Zinkoxid
Dewey Decimal Classification:	Naturwissenschaften und Mathematik / Physik
faculties:	Fakultät für Physik und Astronomie
Licence (German):	Keine Creative Commons Lizenz - es gelten der Veröffentlichungsvertrag und das deutsche Urheberrecht

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