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Imaging ferromagnetism on the micrometre scale : a scanning SQUID microscopy study

Reith, P. (2015) Imaging ferromagnetism on the micrometre scale : a scanning SQUID microscopy study.

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Abstract:Superconducting quantum interference devices (SQUIDs) are currently the single most accurate magnetometers. Scanning SQUID microscopy (SSM) combines the field resolution of SQUIDs with scanning techniques from scanning probe microscopy to image magnetic flux on the surface of samples. This thesis describes experimental applications of SSM, as well as discussing the possibilities and limitations the technology has. Part of this work is a discussion on the spatial resolution of SSM, looking at different factors affecting it and visualising these through simulations of different magnetic phenomena. This is supplemented by an analysis of deconvolution methods that can aid SSM by reversing the effects of the finitely-sized pickup loop. In addition, SSM is applied to image the ferromagnetism on the surface of LaMnO3 thin films deposited on SrTiO3 substrates deposited at oxygen pressures between 10.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
Link to this item:http://purl.utwente.nl/essays/67103
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