Charakterisierung von anisotropen Magnetowiderstandseffekten in Nanostrukturen aus Permalloy und Eisenaluminium

Characterization of Anisotropic Magnetoresistance Effects in Nanoscaled Structures out of Permalloy and Iron-Aluminum

  • Magnetfeldinduzierte Widerstandseffekte werden in der heutigen Zeit vermehrt in digitalen Speichermedien
  • Magnetic field induced resistance effects are used in digital storage media - like hard disk read heads. To produce commercial devices it is of utmost importance to understand and tune the effect. The ion beam induced change of ferromagnetic or paramagnetic effects is known since 1986. However, most of the research was done on bulk material. Due to the increasing miniaturization of digital storage devices it is essential to investigate also the behavior in thin films. Taking into account that a commercial use of the devices is favored, it was focused on easy and reproducible sample geometries. The aim of this thesis was to produce, tune and characterize magnetic field induced resistance changes in thin films of permalloy and iron-aluminum. Afterwards, the results have been used to create well-defined nanostructures with potential giant magnetoresistance effects. It is shown, that magnetoresistance effects can be created (iron-aluminum) or nearly completely destroyed (permalloy) by ion beam irradiation. The measurements were performed by a self-programmed LabVIEW program with the precise four-terminal sensing setup at low temperatures and with a variable magnetic field up to 2.5 T. The variation of the angle between current flow and the magnetic field as well as measurements at different temperatures led to a very good understanding of the occurring phenomena.

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Metadaten
Author:Tobias Warnatz
Advisor:Wieland Zahn
Document Type:Bachelor Thesis
Language:German
Name:HZDR
Bautzner Landstraße 400, 01328 Dresden
Date of Publication (online):2018/02/22
Year of first Publication:2013
Publishing Institution:Westsächsische Hochschule Zwickau
Date of final exam:2013/05/27
Tag:Ionenbestrahlung; Magnetismus; dünne Schichten; magnetoresistive Effekte
ion beam irradiation; magnetism; magnetoresistance effects; thin films
Page Number:- Seiten, - Abb., - Tab., - Lit.
Faculty:Westsächsische Hochschule Zwickau / Physikalische Technik, Informatik
Release Date:2018/02/22