Die vorliegende Arbeit untersucht elektronische Korrelationseffekte in Realsubstanzen wie Europium-Sulphid (EuS) und Gadolinium-Nitrid (GdN). Es wird dazu eine Kombination von vielteilchentheoretischen Analysen der Spin-Austauschwechselwirkung zwischen itineranten Bandelektronen und lokalisierten 4f-Momenten, durchgefuehrt im Rahmen eines Mehr-Band-Kondo-Gitter-Modells (KLM), mit first-principles (T=0) Bandstrukturrechnungen vorgeschlagen. Die Ein-Teilchen-Energien (hopping-Integrale), die als Energie-Matrix in den Mehr-Band-Hamilton-Operator eingehen, werden einer TB-LMTO-ASA entnommen. Die interessierenden physikalischen Eigenschaften wie die Quasiteilchen-Spektraldichte und die Quasiteilchen-Zustandsdichte werden mit der Bewegu-ngsgleichungs-Methode Greencher Funktionen berechnet. Dazu wird fuer die gesuchte Mehr-Band-Selbstenergie der itinerantenLadungstraeger als Verallgemeinerung des sogenannten Interpolating Selfenergy Approach (ISA) ein Ansatz vorgeschlagen. Es stellt sich heraus, dassdas elektronische Anregungsspektrum durch die Austausch-Kopplung an das lokalisierte Momenten-System eine spektakulaere Temperaturabhaengigkeit aufweist, in Uebereinstimmung mit vorliegenden experimentellen Beobachtungen. Stark temperaturbestimmte Korrelationseffekte werden registriert, z.B. eine mit fallender Temperatur in der ferromagnetischen Phase auftretende Rotverschiebung der unteren Leitungsbandkante in guter Uebereinstimmung mit experimentellen Daten. Um die reinen f-Spin-Korrelationen zu beschreiben, wird eine modifizierte RKKY-Theorie fuer Mehr-Band-Systeme entwickelt, wobei durch Ausmitteln der elektronischen Freiheitsgrade das Mehr-Band KLM auf ein effektives Heisenberg-Modell abgebildet wird. Mit einer RPA-Theorie wird das effektive Heisenberg-Modell auf Aussagen zu zentralen magnetischen Eigenschaften wie Curie-Temperatur und Magnetisierungskurve analysiert. Durch gezielte Variation der Systemparameter wird die Brauchbarkeit des Modells getestet. / This dissertation deals with a combination of many-body evaluation of a spin exchange interaction between the itinerant electrons and localized 4f moments on a periodic lattice, i.e. within the so-called multi-band Kondo lattice model (KLM), and the T=0 first principles calculations in order to study the electronic correlation effects in real materials like Europium Sulphide (EuS) and Gadolinium Nitride (GdN).The single-particle ground state energy or hopping integral acting as an input in the many-body part is obtained using tight binding linear muffin-tin orbital within atomic sphere approximation (TB-LMTO-ASA) program and is a matrix in general. The physical properties of interest like the quasi-particle spectral density and quasi-particle density of states are calculated within the Green function theory and the equation of motion method. In order to do so the required multi-band self-energy of the band electrons istaken as an ansatz, i.e. the so-called interpolating self-energy approach (ISA). The electronic excitation spectrum gets a striking temperature dependence by its exchange coupling to the localized spin system. We observe very strong temperature dependent electronic correlation effects in GdN and the calculated red-shift of the lower conduction band is in close comparison with experiment. In order to determine the pure f-spin correlations, we develop the multi-band modified RKKY theory. The central idea of this theory beingto average out the itinerant electron degrees of freedom from the spin-exchange interaction and map the latter on to an effective Heisenberg model. Using this procedure, we determine the magnetic properties of the system like Curie temperature (within Random Phase Approximation) while calculating the chemical potential and magnetization within a self consistent scheme for various configurations of system parameters.

Im Gebiet der Spin-Elektronik wird der Spin des Elektrons zusätzlich zu seiner Ladung für Bauelementkonzepte ausgenutzt. Hierbei ist die effiziente elektrische Erzeugung einer Spinakkumulation in einem halbleitenden Material von großer Bedeutung. Die Erzeugung der Spinakkumulation kann mithilfe eines ferromagnetischen Metall-Kontaktes erfolgen. Wird eine elektrische Spannung an die Grenzfläche zwischen dem ferromagnetischen Metall und dem Halbleiter so angelegt, dass spinpolarisierte Elektronen vom Metall in den Halbleiter fließen, spricht man von elektrischer Spininjektion. Bei einer Umkehrung der Spannung werden bevorzugt Elektronen der entgegengesetzten Spinorientierung aus dem halbleitenden Material entfernt. Dieser Prozess wird als Spinextraktion bezeichnet. In dieser Arbeit wird die elektrische Erzeugung einer Spinakkumulation in lateral strukturierten, epitaktischen Hybridstrukturen bestehend aus ferromagnetischen Metallkontakten auf n-dotiertem GaAs untersucht. Allgemein ist neben der Spinpolarisation im Ferromagneten auch die spinunabhängige elektrische Charakteristik eines Kontaktes von zentraler Bedeutung für die effiziente Spinerzeugung. Hier wird gezeigt, dass die gewöhnlichen Strom-Spannungs-Kennlinien die Spininjektionseigenschaften dominieren können. Außerdem wird ein neuartiges Bauelementkonzept vorgestellt und experimentell untersucht. Hierbei handelt es sich um ein lokales Spin-Ventil, welches Spinextraktion statt Spininjektion als Spinerzeugungsprozess verwendet. Im Gegensatz zum gewöhnlichen lokalen Spin-Ventil kann ein solches Extraktions-Spin-Ventil als Baustein eines erweiterten Bauelements angesehen werden, welches auf mehreren, aufeinanderfolgenden Extraktionsprozessen beruht. Die Eigenschaften des Extraktions-Spin-Ventils werden diskutiert und es wird gezeigt, wie seine Funktionalität beispielsweise für das Auslesen der Daten in magnetischen Speichern angewendet werden kann. / The efficient electrical generation of a spin accumulation inside a semiconductor (SC) utilizing the interface with a ferromagnetic metal (FM) is essential for the realization of many spintronic device concepts, in which the spin of the electron is exploited in addition to its charge for computational and memory purposes. At FM/n-type SC hybrid contacts, the application of a reverse bias leads to the injection of spin-polarized electrons into the SC. Alternatively, an applied forward bias can be used to generate a spin accumulation of opposite sign due to the extraction of electrons with a particular spin orientation. In this work, the electrical generation and detection of a spin accumulation is studied using epitaxial and laterally structured ferromagnetic metal/n-type GaAs hybrid systems in various measurement geometries. To achieve a high spin generation efficiency, the spinindependent electrical properties of the contact have to be considered in addition to the choice of the injector material with respect to its degree of spin polarization. Here, it is shown that the current-voltage characteristics can even constitute the dominating design parameter with respect to the spin injection properties. In addition, a novel device concept is presented and studied experimentally. This approach essentially relies on spin extraction as the spin generation process in a local spin valve geometry. In contrast to local spin valves based on spin injection, the presented extraction spin valve can be regarded as a building block of an extended device comprising multiple extraction events along the lateral spin transport channel. It is shown how such multiple extraction spin valves allow for an intriguing functionality, which can be used, for example, for the read-out of data in magnetic memory applications.

Diese Arbeit beschäftigt sich mit dem Auftreten verschiedener magnetischer Phasen (Ferro-, Antiferro-, Paramagnetismus) im Kondo-Gitter-Modell (engl. Kondo-lattice model, KLM). Mit dem KLM wird die Wechselwirkung itineranter Elektronen mit lokalisierten magnetischen Momenten beschrieben. Zur Berechnung wichtiger Kenngrößen wird der Green-Funktions-Formalismus verwendet, der schließlich zu einer Näherungslösung führt. Es wird gezeigt, dass eine hinreichend gute Näherung, insbesondere die explizite Betrachtung von Doppelbesetzungen, notwendig ist, um die Resultate nicht zu verfälschen. Es ist damit möglich, Phasendiagramme in Abhängigkeit wichtiger Modellparameter bei verschwindender Temperatur zu berechnen. Um Ergebnisse bei endlichen Temperaturen zu erhalten, wird eine Möglichkeit zur Berechnung der freien Energie eingeführt, die das KLM wesentlich direkter beschreibt als die Standardabbildungsmethode der Rudermann-Kittel-Kasuya-Yoshida-Wechselwirkung. Neben der Berechnung des reinen KLMs erlauben diese Methoden auch eine Beschreibung von Systemen mit gebrochener Translationssymmetrie. Konkret werden verdünnte magnetische Halbleiter und dünne magnetische Filmsysteme betrachtet. Es entstehen hier zusätzliche Effekte wie der Ladungstransfer von magnetischen zu unmagnetischen Gitterplätzen oder umgekehrt. Insgesamt zeigt sich außerdem eine qualitative Übereinstimmung mit verschiedenen experimentellen Daten. / This thesis is concerned with the existence of magnetic phases (ferro-, antiferro-, paramagnetism) in the Kondo-lattice model (KLM). The KLM describes an interaction between itinerant electrons and localized magnetic moments. For the calculation of important quantities the Green''s function formalism is used which leads to an approximative solution of the problem. It is shown that a sufficient approximation, in particular the explicit treatment of double occupations, is necessary to avoid a falsification of the results. Thereby it is possible to calculate magnetic phase diagrams in dependence of important model parameters at vanishing temperature. To get results at finite temperature a possibility for the calculation of the free energy is introduced, which describes the KLM more directly than the standard procedure of the Rudermann-Kittel-Kasuya-Yoshida interaction. Besides the calculation of the pure KLM these methods permit a description of systems with a reduced translational symmetry. More precisely diluted magnetic semiconductors and thin magnetic films systems are treated. In these system new effects arise such as the charge transfer from magnetic to non-magnetic sites and vice versa. All in all there is also a qualitative agreement with several experimental data.

No description available.

The physics of iron pnictides has been the subject of intense research for half a decade since the discovery of superconductivity in doped LaFeAsO in 2008. By now there exists a large number of different materials that are summarized under the term "pnictides'' with significant differences in their crystal structure, electronic properties, and their phase diagrams. This thesis is concerned with the investigation of the various phase transitions that are observed in the underdoped compounds of the pnictide subgroups RFeAsO, where R is a rare-earth element, and AFe_2As_2, where A is an alkaline-earth element. These compounds display two closely bound transitions from a tetragonal to an orthorhombic phase and from a paramagnetic to an antiferromagnetic metal. Both symmetry-broken phases are suppressed by doping or pressure and close to their disappearance superconductivity sets in. The superconducting state is stabilized until some optimal doping or pressure is reached and gets suppressed thereafter. The central goal of this thesis is to improve our understanding of the interplay between these three phases and to describe the various phase transitions. We start from an itinerant picture that explains the magnetism as a result of an excitonic instability and show how the other phases can be included into this picture. This approach is based on the the observation that the compounds we are interested in have a Fermi surface with multiple nested electron and hole pockets and that they have small to intermediate interaction strengths. The thesis starts with a study of the doping dependence of the antiferromagnetic phase transition in four different five-orbital models. We use the random-phase approximation to determine the transition temperature, the dominant ordering vector, and the contribution of the different orbitals to the ordering. This allows us to identify the more realistic models, which give results that are in good agreement with experimental observations. In addition to the frequently made assumption of orbital-independent interaction potentials we study the effect of a reduction of the interaction strengths that involve the d_{xy} orbital. We find that this tunes the system between two different nesting instabilities. A reduction of the interactions that involve the d_{xy} orbital also enhances the tendency towards incommensurate (IC) order. For a weak reduction this tendency is compensated by the presence of the orthorhombic phase. However, for a reduction of 30%, as it is suggested by constrained random-phase-approximation calculations, we always find large doping ranges, where a state with IC order has the highest transition temperature. We continue the investigation of the magnetic phase transition by studying the competition of different possible types of antiferromagnetic order that arises from the presence of two degenerate nesting instabilities with the ordering vectors (pi,0) and (0,pi). We derive a Ginzburg-Landau free energy from a microscopic two-band model and find that the presence of the experimentally observed stripe phase strongly depends on the number and size of the hole pockets in the system and on the doping. We show that within the picture of a purely magnetically driven nematic phase transition, which breaks the C_4 symmetry and induces the orthorhombic distortion, the nematic phase displays exactly the same dependence on the model parameters as the magnetic stripe phase. We propose that in addition to the purely magnetically driven nematic instability there is a ferro-orbital instability in the system that stabilizes the nematic transition and, thus, explains the experimentally observed robustness of the orthorhombic transition. We argue that including a ferro-orbital instability into the picture may also be necessary to reproduce the transition from simultaneous first-order transitions into an orthorhombic antiferromagnetic state to two separate second-order transitions, which is observed as a function of doping. Finally, a study of the superconducting phase transition inside the antiferromagnetic phase that is observed in some pnictide compounds is presented. We present an approach to calculate the fluctuation-mediated pairing interaction in the spin-density-wave phase of a multiband system, which is based on the random-phase approximation. This approach is applied to a minimal two-band model for the pnictides to study the effect of the various symmetry-allowed bare on-site interactions on the gap symmetry and structure. We find a competition between various even- and odd-parity states and over a limited parameter range a p_x-wave state is the dominant instability. The largest part of the parameter space is dominated by even parity states but the gap structure sensitively depends on the bare interactions. We propose that the experimentally observed transition from a nodeless to a nodal gap can be due to changes in the on-site interaction potentials.

The concept of percolated perpendicular media (PPM) for magnetic data storage is expected to surpass the areal storage density of 1 Tbit in -², which is regarded as the fundamental limit of conventional granular CoCrPt:oxide based recording media. PPM consist of a continuous ferromagnetic thin film with densely distributed defects acting as pinning sites for magnetic domain walls. In this study, practical realizations of PPM were fabricated by the deposition of [Co/Pt]8 multilayers with perpendicular magnetic anisotropy onto nanoperforated templates with various perforation diameters and periods. The structural defects given by the templates serve as pinning sites for the magnetic domain walls within the [Co/Pt]8 multilayers. Magnetometry at both the integral and the local level was employed to investigate the influence of the template on the magnetization reversal and the domain wall pinning. It was found, that magnetic domains can be pinned at the ultimate limit, between three adjacent pinning sites. The coercivity and the depinning field, which both are a measure for the strength of the magnetic domain wall pinning, were found to increase with increasing perforation diameter. The size of magnetic domains within the magnetic film appeared not to depend solely on the diameter of the nanoperforations or on the period of the template, but on the ration between diameter and period. By means of micromagnetic simulations it was found, that the presence of ferromagnetic material within the pinning site given supports the pinning of magnetic domain walls, compared to a pinning site that is solely given by a hole in the magnetic thin film. Investigation of the evolution of the magnetization in magnetic fields smaller than the coercive field revealed, that the energy barrier against thermally induced magnetization reversal is sufficiently large to provide long-term (> 10 years) stability of an arbitrary magnetization state. This could also be qualitatively supported by micromagnetic simulations. Static read/write tests with conventional hard disk recording heads revealed the possibility of imprinting bit patterns into the PPM under study. The minimum bit pitch that could be read back thereby depended on the period of the nanoperforated template.

Die Wirkung von Seltenerd-Stoerelementen in Seltenerd-Seltenerd-Nickel-Borkarbid-Verbindungen, die im gleichen Temperaturbereich Supraleitung und magnetische Ordnung zeigen, wird in Hinblick auf die Unterdrueckung der Supraleitung untersucht. Sie aeussert sich in magnetischer Paarbrechung, ferngeordneten Magnetstrukturen und Unordnung. Die Verbindungen wurden entsprechend der an das Material gestellten Anforderungen mittels Lichtbogenschmelzen, Rascherstarrung oder durch Einkristallzucht hergestellt. Die Unterdrueckung der supraleitenden Uebergangstemperatur in diesen Mischreihen mit magnetischen und nichtmagnetischen Seltenerdionen wird durch den Einfluss des effektiven de Gennes-Faktors, der der Konzentration der magnetischen Seltenerdionen Rechnung traegt, des Kristallfeldes und der durch die unterschiedlichen Radien der Seltenerdionen verursachten Unordnung erklaert. Die Unordnung wird durch die Varianz der Ionenradien quantifiziert und ihre Auswirkung auf die supraleitende Uebergangstemperatur und das obere kritische Feld sowie dessen Kruemmung in der Naehe der Uebergangstemperatur beobachtet. Die Uebergagstemperatur von Yttrium-Seltenerd-Nickel-Borkabid-Verbindungen wird im Bereich schwacher Konzentration von magnetischer Seltenerdionen fuer alle magnetischen Seltenerdionen qualitativ erfasst. In antiferromagnetisch geordneten Seltenerd-Seltenerd-Nickel-Borkabid-Verbindungen wirken unmagnetische Verunreinigungen stark paarbrechend, wobei dieser Mechanismus durch die Unordnung verstaerkt wird. Durch Neutronenbeugungsexperimente wurden die magnetischen Strukturen der Seltenerd-Seltenerd-Nickel-Borkabid-Verbindungen nachgewiesen. Bei vollstaendig ausgebildeter antiferromagnetischer Ordnung verzerrt das Kristallgitter aufgrund magnetoelastischer Effekte. In Holmium-Seltenerd-Nickel-Borkabid-Verbindungen konnten die drei bekannten magnetischen Strukturen gefunden werden, wodurch die Korrelation zwischen dem reentrant-Verhalten und magnetischer Fernordnung nachgewiesen wurde. Im aeusseren Magnetfeld werden die Strukturen anhand eines bekannten Feld-Temperatur-Phasendiagramms erklaert, in dem die magnetischen Ueberstrukturen als Funktion von Feld und Temperatur aufgestellt wurden.

This thesis deals with the analysis of magnetic losses in electrical machines and the possibilities of their measurement. Magnetically soft and hard materials are very prone to changing magnetic properties. They can be changed simply by changing the temperature of the material or different stresses induced in the material, resulting in different results. These changes are important to keep in mind when an electric machine is being designed. The original parameters of the affected materials can be restored by annealing or grinding. These methods release the induced stresses within the material. Due to these effects, it is also important to know how to measure magnetic parameters. Each way has its own specifics and has a certain error of the measurement. When the machines for higher efficiency, rpm or higher temperatures are designed, it is advisable to know how their magnetic properties changed. This thesis deals with the properties of different materials, their measurements and finally simulation of the chosen electric machine with the application of the measured results.

With the application of new technological trends and principles of scientific research in general, places on environmental influences (everything what surrounds human - building interior and exterior materials, urban areas) and also with sustainable development and ecology, etc., and on health and psychological well-being humans and thus puts on architecture and building entirely new demands on the application of new principles. Due to global climate change, which recently published the official report of the International Panel on Climate Change (IPCC), are placed on reducing the emissions into the atmosphere greater demands on. If architects previously were requested by the client, building with optimal solutions and functional expression of aesthetic quality, so now in addition to increasing demand on building´s solution with low power consumption using environmentally friendly materials from renewable resources and completely satisfying idea of sustainable development. Global societal trends is reverting to the traditional approaches to creating an environment (the application of natural materials, Feng Shui, Building Biology, etc.). The growing trend in today's society on issues of sustainable development, conservation of natural conditions, examining the effects of construction on human health and psychological well-being, which the aims bring together experts seemingly unrelated fields such as geophysics, medicine, architecture, civil engineering, etc., and their findings, according to aspects of the disciplines draw general rules of healthy living. Emerging and still evolving field aims to examine the relationship between man and his environment. The logical starting point is therefore in the context of examining the structure of the first dwelling. Buildings where people spend at least one third of their life. Building, whose location, orientation, mass, materials used in building itself as well as those that surround people in the interior, and many others will affect the physical and physiological action. Not only health but also mental well-being of man is as much determined by a whole range of relationships and linkages. Structural system guidelines for healthy living is the main reason of the work, clear what assumptions we have taken into account in the design and how it specifically relates to a quality place to rest – the Geomagnetic field is one of the base point, which lead to healthy living. Interaction of architecture and geomagnetic field and their values are processed in the evaluation system. It would lead to clarification of the relationship between the occurrence of these anomalies and building materials, construction, site selection for construction of buildings and other solutions. I will desribing the relationship between human´s health and the incidence of these artificial or natural anomalies at the same time.

This work is divided in two thematic parts. The first part shows a refurbishment of a Omicron low temperature STM set-up and its utilization for preparation of superconducting-magnetic interfaces. First, a cleaning procedure of suitable metallic substrates, specifically W(110) and Ir(111), is shown. It is followed by results of iron monolayer deposition on Ir(111) (Fe-Ir(111) interface). The last section deals with study of vanadium growth on pure Ir(111) substrate as well as on mentioned Fe-Ir(111) interface. The second thematic part deals with magnetism of cobalt atoms on a monolayer metal dichalcogenide WS2. It focuses primarily on studying their magnetic moment and magnetic anisotropy using X-ray magnetic circular dichroism (XMCD).