Cuvillier Verlag

35 Jahre Kompetenz im wissenschaftlichen Publizieren
Internationaler Fachverlag für Wissenschaft und Wirtschaft

Cuvillier Verlag

De En Es
Spin-Polarized Currents for Spintronic Devices: Point-Contact Andreev Reflection and Spin Filters

Printausgabe
EUR 19,00 EUR 18,05

E-Book
EUR 13,30

Spin-Polarized Currents for Spintronic Devices: Point-Contact Andreev Reflection and Spin Filters

Sebastian von Oehsen (Autor)

Vorschau

Inhaltsverzeichnis, Datei (5,8 KB)
Leseprobe, Datei (120 KB)

ISBN-13 (Printausgabe) 3867274320
ISBN-13 (Printausgabe) 9783867274326
ISBN-13 (E-Book) 9783736924321
Sprache Englisch
Seitenanzahl 132
Auflage 1
Band 0
Erscheinungsort Göttingen
Promotionsort Hamburg
Erscheinungsdatum 30.11.2007
Allgemeine Einordnung Dissertation
Fachbereiche Physik
Beschreibung

The emerging field of spintronics deals with the control and manipulation of the spin of the elec¬trons rather than the charge. The first chapter of this thesis gives an overview of the areas of research in spintronics and puts the goals of the present work into the perspective of the work on spintronic devices. Amongst others, the generation of highly spin-polarized currents, i.e., currents with a nonequilibrium spin population, is of high importance for spintronics. In this thesis two different approaches to the generation of spin-polarized currents are investigated. In the second chapter the ferromagnetic Heusler alloy Ni2MnIn is investigated. It is a candidate as a half-metallic spin-injector. We use point-contact Andreev reflection as a method to determine the spin polariza¬tion of thin films of Ni2MnIn. A detailed description of the theoretical basics of the method is given. The setup for this technique has been optimized within this work. Measurements are per¬formed on Au, Ni, and Ni2MnIn films. The experimental data is analyzed using three different the¬oretical models. Chapter 3 deals with an alternative approach to generate spin-polarized currents: the realization of a full-semiconductor spin filter. In such a device the spin polarization originates from the spin-orbit interaction in the two-dimensional electron gas in an InAs heterostructure. To obtain one-dimensional electron channels in the filter we have designed quantum point contacts. The chapter is divided into one part that presents the theoretical basics of quantum point contacts and of spin filters and a second part that gives the experimental results. The thesis ends with a conclusion and an outlook.