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    Fabrication and Characterization of Geometrically Confined Fe3Sn2 Skyrmion-based Devices

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    Name:
    Fabrication and Characterization of Geometrically Confined Fe3Sn2 Skyrmion-based Devices.pdf
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    2.790Mb
    Format:
    PDF
    Description:
    Chen Gong - Final Paper
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    Type
    Thesis
    Authors
    GONG, CHEN cc
    Advisors
    Zhang, Xixiang cc
    Committee members
    Manchon, Aurelien cc
    Li, Xiaohang cc
    Program
    Material Science and Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2018-06-27
    Embargo End Date
    2019-07-03
    Permanent link to this record
    http://hdl.handle.net/10754/628036
    
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    Access Restrictions
    At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2019-07-03.
    Abstract
    Skyrmion is a topologically protected nanometer-sized spin configuration, which makes it a promising candidate for future memory devices. All skyrmion applications are based on the formation and manipulation of spin textures in nanostructured elements. Therefore, fabrication of geometrically confined skyrmion-based nanodevices is an essential step in the investigation of skyrmion properties. In this study, my research mainly focuses on the fabrication of high-quality Fe3Sn2 nanostripes with different geometric parameters for Lorentz transmission electron microscopy (LTEM) by a focused ion beam (FIB) system. The observation of the skyrmions using LTEM was mainly performed by Dr. Qiang Zhang, although I have deeply involved the discussion on new samples to be fabricated based on the results obtained from LTEM and also performed some LTEM experiments. To investigate the formation process and thermal stability of skyrmions in a geometrically confined environment, I have fabricated more than fifty high-quality nanostripes with a width of 265-4,000 nm. Studying with LTEM, a distinct evolutionary path of stripe-skyrmion transformation is observed after gradually increasing the magnetic field (out-of-plane direction) and the critical magnetic field of skyrmion is found to decrease with an increasing strength of confinements. Moreover, a series of racetrack devices with controlled thicknesses (125-404 nm) is fabricated to study the effect of thickness in skyrmion formation. Overall, in order to obtain less damaged, flat skyrmion-based devices by FIB system, experimental parameters are optimized and fabrication skills are improved. This method develops the possible application of centrosymmetric frustrated magnet Fe3Sn2 in skyrmion-based racetrack devices.
    DOI
    10.25781/KAUST-3UD1C
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-3UD1C
    Scopus Count
    Collections
    Theses; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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