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Magnetic skyrmion phase in MnSi thin films

Author: Murray Neff Wilson; Dalhousie University. Department of Physics and Atmospheric Science,
Publisher: Halifax, NS : Dalhousie University, 2013. ©2013.
Dissertation: Thesis M.Sc. Dalhousie University, 2013.
Edition/Format:   Thesis/dissertation : Document : Thesis/dissertation : eBook   Computer File : English
Summary:
ABSTRACT: Detailed magnetometry and polarized neutron reflectometry studies were conducted on MnSi thin films grown epitaxially on Si(111) substrates. It is demonstrated that with an in-plane applied field H l l [110], a broadly stable skyrmion phase exists at elevated temperatures and fields. Magnetometry and transport measurements with an out-of-plane applied field H l l [111] prove that no skyrmion phase exists  Read more...
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Details

Genre/Form: Electronic thesis or dissertation
Material Type: Document, Thesis/dissertation, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Murray Neff Wilson; Dalhousie University. Department of Physics and Atmospheric Science,
OCLC Number: 951381066
Notes: Title from PDF title page (viewed Apr. 13, 2016).
Thesis supervisor: Dr. Theodore Monchesky.
Description: 1 online resource (xxiv, 92 leaves) : illustrations (some colour).
Responsibility: by Murray Neff Wilson.

Abstract:

ABSTRACT: Detailed magnetometry and polarized neutron reflectometry studies were conducted on MnSi thin films grown epitaxially on Si(111) substrates. It is demonstrated that with an in-plane applied field H l l [110], a broadly stable skyrmion phase exists at elevated temperatures and fields. Magnetometry and transport measurements with an out-of-plane applied field H l l [111] prove that no skyrmion phase exists in this geometry. However, Hall effect measurements in this geometry show unexpected evidence of a topological Hall effect. This can be explained with a multi-dimensionally modulated cone phase, which proves that contrary to recent literature, a topological Hall effect is not sufficient proof of skyrmions. The results of this thesis represent a significant step towards a technologically relevant material in which skyrmions are broadly stable. A material of this type could be used in novel magnetic storage devices and signi ficantly impact our future computing capabilities.

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