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Bellini, spintronics phd thesis, Eleonora Characterisation of magnetic nanostructures for spintronic applications by electron microscopy. PhD thesis, University of Glasgow. The work presented in this PhD thesis concerns the characterisation of the physical structure, composition and domain structure of advanced magnetic materials by electron microscopy within the FP6 European Research Training Network "Spinswitch".
Chapter 1 will provide an overview of the physics behind the topics treated during this work and a description of the general motivations of the research carried out. Chapter 2 will provide an overview of all the experimental techniques employed for the fabrication and characterisation of the samples investigated for this research, spintronics phd thesis. We carried out first the investigation of the physical structure performed by selected area diffraction and bright field imaging of planar samples and physically the plan view sections show the structure of spintronics phd thesis films appears similar.
The magnetization reversal behaviour observed during Lorentz TEM experiments are found to vary considerably with the CoFeB thickness, spintronics phd thesis, with both domain wall formation and magnetisation rotation seen. In the thicker film the behaviour was characteristic of a typical soft magnetic material with uniaxial anisotropy.
However the magnetic reversal of the thinner film was more complex, spintronics phd thesis. A particular characteristic of the 14 Å CoFeB layer is the variation of domain wall angle seen when varying the orientation of the applied field This wall asymmetry suggests the presence of a unidirectional anisotropic energy term.
To assist in the interpretation of these experimental results a modified Stoner—Wohlfarth model has been constructed and calculations have been carried out by using a MATLAB code. In particular the objective was the characterisation of the structure and local chemistry of the nanowires by TEM and the classification of nanowire switching deduced by Lorentz microscopy experiments, which are challenging for this specific material spintronics phd thesis. In order to perform TEM studies on single nanowires, they should be extracted from their template.
The chemical etching used to remove the nanowires from the template in addition to issues related to the deposition of Cu, led to nanowires with edge and compositional irregularities, detrimental for their magnetic properties.
Indeed, we were not able to spintronics phd thesis the nanowire switching and investigate domain walls forming during the reversal process, but we could only observe a change in the magnetising state. A lot of the work described in this chapter deals with the difficulties associated with imaging these challenging nanowires. The two multilayers represent the free layer of a perpendicular MTJ pMTJ and this study represents a state of development of materials for pMTJs. Experiments were performed by MOKE magnetometry spintronics phd thesis polar configuration and Lorentz Microscopy in Fresnel mode.
Materials were prepared in Spintec-CEA, Grenoble France spintronics phd thesis the MOKE experiments were also carried out, and Lorentz Microscopy experiments were performed in Glasgow. We observed a small scale random domain structure that we can ascribe to perpendicularly magnetised domains. For higher temperatures °C - °C we found a behaviour typical of a soft magnetic material magnetised in plane with low anisotropy and high susceptibility.
The magnetisation is out of plane for all the temperatures investigated. The sample develops a different domain structure when the sample is heated below °C or above °C. In the first case isotropic serpentine domain structure is visible, with a large periodicity, whereas in the second case, an anisotropic stripe domain structure is visible with a small periodicity. Skip to main content Accessibility information. Site navigation Study Research About us Student life Alumni Support us Contact.
Site tools A-Z Lists. Home Enlighten Theses. Enlighten: Theses. Characterisation of magnetic nanostructures for spintronic applications by electron microscopy.
Full text available as: Preview. Back to spintronics phd thesis. Contact us The University of Glasgow is a registered Scottish charity: Spintronics phd thesis Number SC PDF Download 52MB Preview. Ms Eleonora Bellini.
Ian's PhD Thesis: Algorithmic Development in Computational Chemistry
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