The Application of Interferometric Electron Microscopy for Nanomagnetic Imaging

dc.contributor.advisorMcMorran, Benjamin
dc.contributor.authorGreenberg, Alice
dc.date.accessioned2021-04-27T20:42:22Z
dc.date.available2021-04-27T20:42:22Z
dc.date.issued2021-04-27
dc.description.abstractThe study of micromagnetics both yields important applications, like computer hard disks which enabled the creation of the internet, and continues to reveal surprising phenomena and open new scientific questions, like the search for the magnetic hopfion [1], a 3D topological soliton. An important trend in micromagnetics research is studying topological magnetic structures, with particular interest in their potential as nanoscale information carriers. For instance, the magnetic skyrmion, a topological soliton, can be as small as 1 nm and may enable new forms of data storage and computing due to its high mobility and topological protection [2]–[4]. However, this is pushing the resolution of imaging techniques. One of the few methods that can image magnetic materials at this scale is transmission electron microscopy (TEM).Here I will present the use of transmission electron microscopy to study nanoscale topological magnetic domains under an applied magnetic field in a novel thin film material in which both the dipole interaction and the Dzyaloshinskii-Moriya interaction determine the magnetic structure [5]. I demonstrate the first application of scanning TEM holography, a recently developed phase measurement technique, implemented with a diffraction grating to image magnetic materials. Lastly, I propose how this technique could be used to perform the first experimental observation of a magnetic hopfion and show initial results.en_US
dc.identifier.urihttps://hdl.handle.net/1794/26172
dc.language.isoen_US
dc.publisherUniversity of Oregon
dc.rightsAll Rights Reserved.
dc.subjectElectron Microscopyen_US
dc.subjectHolographyen_US
dc.subjectLorentz TEMen_US
dc.subjectMicromagneticsen_US
dc.titleThe Application of Interferometric Electron Microscopy for Nanomagnetic Imaging
dc.typeElectronic Thesis or Dissertation
thesis.degree.disciplineDepartment of Physics
thesis.degree.grantorUniversity of Oregon
thesis.degree.leveldoctoral
thesis.degree.namePh.D.

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