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Direct Experimental Observation of 3...

Moraski, Rich.

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Direct Experimental Observation of 3D Vortex States in Multilayer Fe/GD Using Scanning Electron Microscopy with Polarization Analysis (SEMPA).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Direct Experimental Observation of 3D Vortex States in Multilayer Fe/GD Using Scanning Electron Microscopy with Polarization Analysis (SEMPA)./
作者:	Moraski, Rich.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	188 p.
附註:	Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
Contained By:	Dissertations Abstracts International84-11B.
標題:	Condensed matter physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30241232
ISBN:	9798379453459

Direct Experimental Observation of 3D Vortex States in Multilayer Fe/GD Using Scanning Electron Microscopy with Polarization Analysis (SEMPA).
Moraski, Rich.

Direct Experimental Observation of 3D Vortex States in Multilayer Fe/GD Using Scanning Electron Microscopy with Polarization Analysis (SEMPA). - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 188 p.

Source: Dissertations Abstracts International, Volume: 84-11, Section: B.

Thesis (Ph.D.)--University of Oregon, 2023.

This item must not be sold to any third party vendors.

The global market for power solely for data center usage is estimated to be $12.4 billion by 2027. In 2021, data center electricity consumption was ∼400 TW h, representing almost 2% of the global energy demand. Ongoing efforts in spintronics, which use spin currents instead of traditional charge currents at a fraction of the power, are paving the way for significant savings, both financially and environmentally. There has been considerable research into alternatives for memory including a magnetic structure known as a skyrmion, a self-supporting magnetic texture characterized by a non-trivial topology. Recent advances in creating room-temperature stable skyrmions has reignited interest in these objects.Building on previous work in the McMorran group, this research set out to build a more complete understanding of the 3D structure of metastable magnetic skyrmions, specifically in Fe/Gd thin films. This was done using traditional trans- mission electron microscope (TEM) techniques along with a unique scanning electron microscope with polarization analysis at the University, the SEMPA. Data collected using a TEM in Lorentz mode, providing information integrated through the bulk of the material, was combined with data from SEMPA, providing surface- sensitive information about the top of the material. Analysis of the data suggests atopologically complex winding nature for the magnetization of skyrmions in this material.Presented herein is a brief introduction of the magnetic structures found in Fe/Gd multilayer thin films; an analysis using new analytical tools built for this purpose of the data collected; and a user's manual for SEMPA, including maintenance and troubleshooting guidance.

ISBN: 9798379453459Subjects--Topical Terms:

3173567
Condensed matter physics.
Subjects--Index Terms:

Antiskyrmions

Direct Experimental Observation of 3D Vortex States in Multilayer Fe/GD Using Scanning Electron Microscopy with Polarization Analysis (SEMPA).
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500 $a Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
500 $a Advisor: McMorran, Benjamin;Belitz, Dietrich.
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506 $a This item must not be sold to any third party vendors.
520 $a The global market for power solely for data center usage is estimated to be $12.4 billion by 2027. In 2021, data center electricity consumption was ∼400 TW h, representing almost 2% of the global energy demand. Ongoing efforts in spintronics, which use spin currents instead of traditional charge currents at a fraction of the power, are paving the way for significant savings, both financially and environmentally. There has been considerable research into alternatives for memory including a magnetic structure known as a skyrmion, a self-supporting magnetic texture characterized by a non-trivial topology. Recent advances in creating room-temperature stable skyrmions has reignited interest in these objects.Building on previous work in the McMorran group, this research set out to build a more complete understanding of the 3D structure of metastable magnetic skyrmions, specifically in Fe/Gd thin films. This was done using traditional trans- mission electron microscope (TEM) techniques along with a unique scanning electron microscope with polarization analysis at the University, the SEMPA. Data collected using a TEM in Lorentz mode, providing information integrated through the bulk of the material, was combined with data from SEMPA, providing surface- sensitive information about the top of the material. Analysis of the data suggests atopologically complex winding nature for the magnetization of skyrmions in this material.Presented herein is a brief introduction of the magnetic structures found in Fe/Gd multilayer thin films; an analysis using new analytical tools built for this purpose of the data collected; and a user's manual for SEMPA, including maintenance and troubleshooting guidance.
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653 $a Hopfions
653 $a Magnetism
653 $a SEMPA
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