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Helmstedt, Andreas: Probing the magnetic properties of [MnIII6CrIII]3+ single-molecule magnets by XAS, XMCD and spin-resolved electron spectroscopy. 2014
Inhalt
Motivation
Theoretical Background
Single-molecule magnets
The [Mn6Cr]3+ SMM
The electron spin
Basic considerations
Spin-dependent electron scattering: The Mott polarimeter
Methods
Synchrotron radiation physics
Synchrotron radiation sources
Overview of the beamlines
Sample preparation
Drop-casting
Airbrush method
X-ray absorption spectroscopy and XMCD
Introduction to XAS
XMCD and sum rules
Limitations of the sum rule approach
Electron Spectroscopy
Theoretical aspects of electron spectroscopy
Application to [Mn6Cr]3+: Spin-resolved electron spectroscopy
Experimental Setup
Electron spectrometer and Mott polarimeter
Electron detectors
Load-lock, sample transfer and preparation chamber
Vacuum design and requirements
Results and Discussion
Characterization of [Mn6Cr]3+ samples
Characterization of samples prepared by drop-casting – the influence of [Mn6Cr]3+ layer thickness
Homogeneity of samples prepared by airbrush method
Detrimental influences on the sample condition
Soft X-ray stability
Effect of anion choice
Substrate influence
Electron spectroscopy of [Mn6Cr]3+
SPES of reference materials
Spin-resolved electron spectra
Spin polarization results for Mn(II)acetate
SPES results of [Mn6Cr]3+ SMM
XMCD of [Mn6Cr]3+ SMM
Discussion of SPES and XMCD results
Comparison: SPES asymmetry and XMCD difference
Influence of the external magnetic field
Summary and Conclusion
Mixed 2p and 3d mj-states
The UHV apparatus at BESSY II
Error calculation algorithm
Acknowledgements
Publications
Statement of Authorship
Bibliography