Silber, Robin: Quadratic magnetooptic Kerr effect spectroscopy of magnetic thin films with cubic crystal structure. 2019
Inhalt
- Declaration of Authorship
- Abstract
- Abstract (Czech version)
- Abstract (German version)
- 1 Introduction
- 1.1 Introduction to the magnetooptic Kerr effect
- 1.1.1 From simple idea to basic model
- 1.1.2 Change of polarization state of light upon reflection
- 1.1.3 MOKE and the permittivity tensor
- 1.1.4 Introduction to quadratic MOKE
- 1.2 Putting MOKE into context
- 1.2.1 History of magnetooptics
- 1.2.2 Recent history, history of QMOKE and state of the art
- 1.2.3 MOKE with respect to other magnetotransport effects
- 1.3 Introduction to this work
- 2 Classical theory behind magnetooptic effects
- 2.1 Electromagnetic waves in matter
- 2.2 Permittivity tensor of a magnetized crystal
- 2.2.1 Complex permittivity, complex conductivity
- 2.2.2 Magnetooptic tensors
- 2.2.3 Permittivity tensor of a cubic crystal structure
- 2.2.4 Permittivity tensor with misaligned axes
- 2.3 Propagation of electromagnetic waves in an anisotropic planar multilayer structure
- 2.3.1 Proper polarization modes in the n-th layer
- 2.3.2 Propagation through the whole multilayer stack - Yeh's formalism
- 2.3.3 Reflection from the multilayer stack
- 2.4 Description of light polarization by the Jones formalism
- 2.4.1 Jones vectors
- 2.4.2 Description of optical elements by the Jones formalism
- 2.4.3 Description of MOKE by the Jones formalism
- 2.5 Separation of linear and quadratic MOKE - concept of the 8-directional method
- 2.6 Conclusion
- 3 Experimental techniques, sample preparation and characterization
- 3.1 MOKE characterization techniques
- 3.1.1 MOKE detection techniques
- 3.1.2 Description of the MOKE setups
- 3.1.3 MOKE for thin film magnetic characterization
- 3.1.4 Python based numerical model for MOKE simulations
- 3.2 Optical characterization technique - ellipsometry
- 3.3 Techniques for sample preparation and structural characterization
- 3.3.1 Techniques for thin film preparation
- 3.3.2 Techniques for thin film structural characterization
- 3.4 Preparation and characterization of samples investigated in this work
- 3.4.1 Fe(001) – layer thickness variation series
- 3.4.2 Co2MnSi(001) – post annealing temperature variation series
- 3.4.3 Fe(011) samples grown on MgO(111) substrates
- 3.4.4 Co(011) samples grown on MgO(011) substrates
- 3.4.5 Ni(111) sample grown on MgO(111) substrate
- 3.5 Conclusion
- 4 The 8-directional method of (001), (011) and (111) oriented thin films with cubic crystal structure
- 4.1 The 8-directional method of (001) orientation
- 4.1.1 Equations of 8-directional method of (001) orientation
- 4.1.2 Comparison of 8-directional equations of (001) orientation to numerical simulations
- 4.1.3 Experimental measurements of Co2MnSi(001) Heusler compound samples, comparison to the theory and to numerical calculations
- 4.1.4 Utilizing 8-directional method of (001) orientation for spectroscopy
- 4.2 The 8-directional method of (011) orientation
- 4.2.1 Equations of 8-directional method of (011) orientation
- 4.2.2 Comparison of 8-directional equations of (011) orientation to numerical simulations
- 4.2.3 Experimental measurements of the Fe(011) samples, comparison to the theory and to numerical calculations
- 4.2.4 Utilizing 8-directional method of (011) orientation for spectroscopy
- 4.3 The 8-directional method of (111) orientation
- 4.3.1 Equations of 8-directional method of (111) orientation
- 4.3.2 Comparison of 8-directional equations of (111) orientation to numerical simulations
- 4.3.3 Experimental measurements of the Ni(111)/MgO(111) sample, comparison to the theory
- 4.3.4 Utilizing 8-directional method of (111) orientation for spectroscopy
- 4.4 Conclusion
- 5 QMOKE spectroscopy of (001) oriented thin films with cubic crystal structure
- 5.1 Measurement principles and data processing
- 5.2 Quadratic and linear MOKE spectroscopy of Fe(001) epitaxial films on MgO(001) substrates
- 5.2.1 Linear MOKE spectroscopy
- 5.2.2 Quadratic MOKE spectroscopy
- 5.2.3 Comparison of the samples grown by molecular beam epitaxy and by magnetron sputtering
- 5.2.4 Comparison of experimental spectra with ab-initio models and literature
- 5.2.5 Consequences of the MOKE sign disagreement between the experiment and numerical model
- 5.3 Quadratic and linear MOKE spectroscopy on partially ordered Co2MnSi Heusler compounds
- 5.3.1 Linear MOKE spectroscopy
- 5.3.2 Quadratic MOKE spectroscopy
- 5.3.3 Comparison to ab-initio calculations
- 5.4 Conclusion
- Final conclusion, remarks and perspectives of the presented work
- A Sign conventions
- B Magnetic anisotropy of Fe(011)/MgO(111) sample RS210917
- C QMOKE spectroscopy of the epitaxial magnetite Fe3O4 thin films
- Bibliography
- List of publications
- Acknowledgements