Unconventional Hall Effect in Ultra-thin SrRuO3 Films

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Unconventional Hall Effect in Ultra-thin SrRuO3 Films

Type: Master thesis
Title: Unconventional Hall Effect in Ultra-thin SrRuO3 Films
Author: Woltjes, Bart
Issue Date: 2019-03-29
Keywords: ultra-thin
thin films
Hall effect
anomalous Hall effect
topological Hall effect
Abstract: Ultra-thin films with different thicknesses of SrRuO3 were grown epitaxially on SrTiO3. The anomalous Hall effect (AHE) with additional peaks was observed in Hall resistivity measurements as a function of field and temperature in a 5 unit cell SrRuO3 film without capping layer. The additional peak phase matches literature, whereas the actual resistivity size is found to be lower. The peaks could be explained by either a topological Hall effect (THE) caused by the presence of a skyrmion lattice or two phases of the AHE corresponding to different interfaces. If the additional effect is a THE, this study confirms the presence of a robust skyrmion phase in ultra-thin SrRuO3 on SrTiO3 without capping layer, while gating experiments indicate that the skyrmion size could be tuned by an electric field.
Supervisor: Allan, Milan
Faculty: Faculty of Science
Department: Physics (Master)
Specialisation: QMO
ECTS Credits: 3
Evaluation: 8
Handle: http://hdl.handle.net/1887/72438

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