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dc.contributor.advisor Ropers, Claus Prof. Dr.
dc.contributor.author Rubiano da Silva, Nara
dc.date.accessioned 2019-05-08T08:52:24Z
dc.date.available 2019-05-08T08:52:24Z
dc.date.issued 2019-05-08
dc.identifier.uri http://hdl.handle.net/11858/00-1735-0000-002E-E628-A
dc.language.iso eng de
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc 530 de
dc.title Ultrafast Lorentz Microscopy using High-Coherence Electron Pulses de
dc.type doctoralThesis de
dc.contributor.referee Ropers, Claus Prof. Dr.
dc.date.examination 2019-03-29
dc.subject.gok Physik (PPN621336750) de
dc.description.abstracteng Information processing and storage applications demand increasing miniaturization and operation speeds, where optical manipulation of magnetic order may play a very important role. It is hence essential to study how light stimulates magnetization reordering at very short spatial and temporal scales. The development of Ultrafast Transmission Electron Microscopy (UTEM), a laser-pump/electron-probe setup, provides a unique means for that. However, magnetic information can only be visualized in UTEM provided a spatially coherent pulsed electron source is available, since phase-contrast techniques such as Lorentz microscopy are required. In this work, highly coherent electron pulses are achieved by implementing a laser-driven Schottky field emitter in UTEM. We employ the electron pulses to map the ultrafast demagnetization of a single magnetic structure with very high spatial and temporal resolution. We show that the transient magnetization can be quantitatively tracked from the image contrast, and that the magnetic order remains rigid with decreased strength on short timescales following the optical excitation. This work builds a solid framework for the acquisition, and quantitative evaluation and interpretation of magnetic contrast images of transient magnetic states. Moreover, it establishes magnetic imaging with high spatiotemporal resolution, and constitutes a step forward in ultrafast phase-contrast imaging on the nanoscale. de
dc.contributor.coReferee Mathias, Stefan Prof. Dr.
dc.subject.eng Ultrafast transmission electron microscopy de
dc.subject.eng UTEM de
dc.subject.eng Coherent ultrashort electron pulses de
dc.subject.eng Nanoscale magnetization dynamics de
dc.subject.eng Lorentz microscopy de
dc.subject.eng Magnetic imaging de
dc.subject.eng Ultrafast dynamics de
dc.subject.eng Ultrafast solid-state physics de
dc.identifier.urn urn:nbn:de:gbv:7-11858/00-1735-0000-002E-E628-A-0
dc.affiliation.institute Fakultät für Physik de
dc.identifier.ppn 1666650900

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