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Title: Resonant X-ray scattering from magnetic multilayers and patterned arrays
Author: Procter, Rachael A.
ISNI:       0000 0004 7223 8958
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 2017
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The structural and magnetic properties of thin films, multilayers and patterned arrays are studied using resonant x-ray scattering. This work shows how resonant scattering techniques can be highly effective when applied to the investigation of interactions across interfaces in a range of magnetic structures. The effect of growth temperature on the roughness of interfaces in a Gd-Y superlattice is studied with specular reflectivity tuned to the Gd L3 absorption edge. Superlattices containing thin layers of Ho within the Y are investigated where the Ho acts as a tagging layer to indirectly measure the Y magnetisation. High roughness meant the Ho could not be resolved in fits to the specular reflectivity. A trilayer of amorphous SmCo and CoAlZr layers is characterised using element specific hysteresis loops recorded at the Co L3 and Sm M4 absorption edges. Evidence is found that the intra-layer interactions of the Co and Sm sub-networks within the SmCo layer are weaker than the inter-layer Co interactions due to the randomly distributed structure of the amorphous layers. There are Co rich regions which span the interface, confirmed by fits to specular reflectivity at the Co L3 edge and modelling of the Co sub-network. Lastly, element specific hysteresis loops recorded using resonant scattering at the Pd L3 absorption edge are used to study magnetisation reversals of patterned arrays of FePd. Resonant specular reflectivity and rocking curves reveal that the circular islands are domed with the magnetisation evenly distributed throughout, and a non-magnetic oxide layer. Simulated rocking curves confirm that there is a non-magnetic oxide layer on the islands.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics