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Skyrmions and Novel Spin Textures in FeGe Thin Films and Artificial B20 Heterostructures

Ahmed, Adam Saied
http://rave.ohiolink.edu/etdc/view?acc_num=osu1492686407034025

Abstract Details

2017, Doctor of Philosophy, Ohio State University, Physics.
Skyrmions are magnetic spin textures that have a non-zero topological winding number associated with them. They have attracted much interest recently since they can be as small as ~1 nm and could be the next generation of magnetic memory and logic. First, we grow epitaxial films of FeGe by molecular beam epitaxy and characterized the skyrmion properties. This had led us to image skyrmions in real-space with Lorentz transmission electron microscopy for the first time in the United States. Next, from an extensive series of thin and thick films, we have experimentally shown the existence of a magnetic surface state in FeGe and, consequently, any skyrmion material for the first time. Complementary theoretical calculations supported the existence of chiral bobbers—a surface state only predicted in 2015. Next, we fabricated for the first time a new class of skyrmion materials: B20 superlattices. These novel heterostructures of [FeGe/MnGe/CrGe] have now opened the door for tunable skyrmion systems with both Dresselhaus and Rashba Dzyaloshinskii-Moriya interactions. Additionally, we perform resonant soft x-ray scattering to image magnetic spin textures in reciprocal space for FeGe thin films in transmission. We have accomplished the removal of substrate and left an isolated single-crystal FeGe film. Lastly, SrO is grown on graphene as a crystalline, atomically smooth, and pinhole free tunnel barrier for spin injection.
Roland Kawakami (Advisor)
Chris Hammel (Committee Member)
Nandini Trivedi (Committee Member)
John Beacom (Committee Member)
178 p.
Physics
Skyrmions; B20; Chiral bobber; Lorentz Transmission Electron Microscopy; Topological Hall Effect; Magnetic Susceptibility; Molecular Beam Epitaxy; SrO; graphene; FeGe; DMI; Superlattice;

Recommended Citations

Citations

  • Ahmed, A. S. (2017). Skyrmions and Novel Spin Textures in FeGe Thin Films and Artificial B20 Heterostructures [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492686407034025

    APA Style (7th edition)

  • Ahmed, Adam. Skyrmions and Novel Spin Textures in FeGe Thin Films and Artificial B20 Heterostructures. 2017. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1492686407034025.

    MLA Style (8th edition)

  • Ahmed, Adam. "Skyrmions and Novel Spin Textures in FeGe Thin Films and Artificial B20 Heterostructures." Doctoral dissertation, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492686407034025

    Chicago Manual of Style (17th edition)

osu1492686407034025
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© 2017, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.