The magnetic properties of transition metal compounds have been studied using SQUID-magnetometry, magnetic force microscopy and Lorentz transmission electron microscopy. New magnetic materials have been found and their magnetic properties have been determined. How the magnetic properties of a material can be changed through e.g. chemical substitution of magnetic and nonmagnetic atoms and shape and size effects have also been studied. Three different sets of samples have been investigated: three new Mn-compounds, two substitution series of layered magnetic structures and ferromagnetic micronsized thin film elements.The three Mn-compounds, Mn3IrSi, IrMnSi and Mn8Pd15Si7, show different magnetic ordering…
Contents
1 Introduction
1.1 Tunable magnetic properties
1.2 Transition metal compounds
1.2.1 Manganese compounds
1.2.2 Layered crystal structures
1.2.3 Micronsized artificial structures
2 Fundamentals
2.1 Disordered magnetic structures
2.1.1 Paramagnetism
2.1.2 Diamagnetism
2.2 Ordered magnetic structures
2.2.1 Ferromagnetism
2.2.2 Antiferromagnetism
2.2.3 Ferrimagnetism
2.2.4 Complex magnetic structures
2.3 Anisotropy
2.3.1 Magnetocrystalline anisotropy
2.3.2 Shape anisotropy
2.4 Ferromagnetic domains
2.5 Micromagnetic simulations
2.6 Density functional theory calculations
3 Experimental technique
3.1 SQUIDs
3.2 MFM
3.3 Lorentz TEM
3.3.1 Fresnel mode
3.3.2 Foucault mode
3.3.3 Differential Phase Contrast
3.4 Diffraction
3.4.1 X-ray diffraction
3.4.2 Neutron diffraction
3.4.3 Rietveld refinements
4 Manganese compounds
4.1 Sample preparation
4.2 Mn3IrSi
4.3 IrMnSi
4.4 Mn8Pd15Si
5 Layered magnetic structures
5.1 TlCo2Se2−xSx
5.1.1 Sample preparation
5.1.2 Magnetic properties
5.2 TlCu2−xFexSe2
5.2.1 Sample preparation
5.2.2 Magnetic properties
6 Micronsized thin film elements
6.1 Permalloy
6.1.1 Sample preparation
6.1.2 Aspect ratio 2:1
6.1.3 Aspect ratio 3:1
6.2 Fe/Co multilayers
6.2.1 Sample preparation
6.2.2 Magnetic properties
7 Concluding remarks
8 Summary in Swedish
8.1 Olika typer av magnetiska material
8.2 Grundläggande magnetiska egenskaper
8.3 Resultat
9 Acknowledgements
References
Author: Felton, Solveig
Source: Uppsala University Library
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