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Electron Holography of Nanoparticles

(2008) Keimpema, Koenraad

This thesis treats a number of aspects of electron holography. In conventional microscopy only the intensity of the object wave is recorded during the imaging process. The phase information is lost. The goal of (electron) holography is to record the phase so that all information contained in the original wave is measured.

The general public knows holography mostly due to the three dimensional holograms that can be found e.g. on many credit cards. The most important application of electron holography is to study the electric and magnetic properties of materials. The electro-magnetic potential inside a material induces a phase shift on the electron wave. Thus measuring this phase shift gives direct information about the electric and magnetic properties of the material.

During the Ph.D. period numerical methods were developed to simulate for a given material the hologram. These methods were then applied to a number of common magnetic structures. This is an example of the direct problem: given a magnetization distribution compute the hologram. Much more important is the inverse problem: given a phase distribution what was the magnetization distribution. In the thesis a number of methods were evaluated to solve this problem. This thesis also reports results of a number of experiments performed on ferromagnetic films and cobalt clusters. The results were analyzed using the methods from this thesis.




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Please use this identifier to cite or link to this item:
http://irs.ub.rug.nl/ppn/314181903

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ID 31352
Mother ID 29343
Order keimpema.k.
Name k.keimpema
Publish yes
OAI name Dissertation
Path faculties/science/2008/k.keimpema/
Name Cover vp.jpg
Last modified: 2013-02-15 14:28:01
Digital ID 48ae7c9bc82a2
Institute Faculty of Mathematics and Natural Sciences
Date available 2008-09-05
Title Electron Holography of Nanoparticles
Title order Electron Holography of Nanoparticles
Electronic yes
Exchangeable no
Printing on demand yes
Export? yes
Number of pages 125
Year issued 2008
Year report 2008
Language en
Type Dissertation
Abstract EN This thesis treats a number of aspects of electron holography. In conventional microscopy only the intensity of the object wave is recorded during the imaging process. The phase information is lost. The goal of (electron) holography is to record the phase so that all information contained in the original wave is measured.

The general public knows holography mostly due to the three dimensional holograms that can be found e.g. on many credit cards. The most important application of electron holography is to study the electric and magnetic properties of materials. The electro-magnetic potential inside a material induces a phase shift on the electron wave. Thus measuring this phase shift gives direct information about the electric and magnetic properties of the material.

During the Ph.D. period numerical methods were developed to simulate for a given material the hologram. These methods were then applied to a number of common magnetic structures. This is an example of the direct problem: given a magnetization distribution compute the hologram. Much more important is the inverse problem: given a phase distribution what was the magnetization distribution. In the thesis a number of methods were evaluated to solve this problem. This thesis also reports results of a number of experiments performed on ferromagnetic films and cobalt clusters. The results were analyzed using the methods from this thesis.
Publisher University of Groningen
Rights University of Groningen
PPN 314181903
ISBN 9789036735315; 9789036735322;
Subject GOO meettechnieken en instrumentatie van de natuurkunde Elektro;
Subject NBC meetmethoden,;
Author Keimpema, Koenraad;
Author(s) name variant Keimpema, Aard;
Tutors Raedt, H.A. de;


 
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