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High Frequency Magnetization Dynamic...

Yarbrough, Patrick.

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High Frequency Magnetization Dynamics Affecting Parallel Pumping, Reﬂectivity and Thermal Properties of Magnets.

Record Type:	Electronic resources : Monograph/item
Title/Author:	High Frequency Magnetization Dynamics Affecting Parallel Pumping, Reﬂectivity and Thermal Properties of Magnets./
Author:	Yarbrough, Patrick.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	132 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
Contained By:	Dissertations Abstracts International81-12B.
Subject:	Physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27994512
ISBN:	9798617085725

High Frequency Magnetization Dynamics Affecting Parallel Pumping, Reﬂectivity and Thermal Properties of Magnets.
Yarbrough, Patrick.

High Frequency Magnetization Dynamics Affecting Parallel Pumping, Reﬂectivity and Thermal Properties of Magnets. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 132 p.

Source: Dissertations Abstracts International, Volume: 81-12, Section: B.

Thesis (Ph.D.)--University of Colorado Colorado Springs, 2020.

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

The world is increasingly dependent on magnetic systems for many devices, from data storage in hard disk drives to information transfer and logical operations, to signal processing and more. As these technologies proliferate throughout our lives, the next generation of magnetic devices are in high demand as the amount of information and data to be stored, transferred, etc. skyrockets. The large tunability of many magnetic systems make them ideal candidates for meeting this demand as fabrication techniques on the nanometer scale become more sophisticated. In this dissertation, the magnetization dynamics for various nanometer-scale magnetic systems are studied. For example, as the band gap from 1-10 GHz is ﬁlled with more wireless devices, there is a desire to develop new technologies that can operate in the frequency regime from 10-1000 GHz. In chapter II, we show how alternating stacks of ultrathin layers of ferromagnetic and non-magnetic materials can exhibit resonance frequencies in the far-infrared frequency regime.As magnetic systems are fabricated on smaller and smaller scales, it is important to understand how different interactions affect the performance of these devices. In chapter III, we explore how the dipolar ﬁeld in a rectangular nanostripe affects the spin waves that are excited. These spin wave excitations are of interest because they provide an alternative to electronic-based devices, which are susceptible to Joule heating at small length scales. We explore how a rectangular ferromagnetic nanostripe in the parallel pumping geometry can produce off-resonance spin waves as well as backward volume magnetostatic spin waves. Another effect which is observed in ultrathin magnetic ﬁlms is the interfacial antisymmetric exchange interaction, which competes with the symmetric exchange interaction to dramatically alter the spectrum of excited spin waves. While this interaction has been known for several decades, there have been few studies on these systems when thermal ﬂuctuations are included. In chapter IV we explore how these thermal ﬂuctuations affect the average magnetization in an ultrathin ﬁlm with and without the antisymmetric exchange interaction. At the end of each chapter, we present conclusions and a future outlook for the potential applications of each magnetic system.

ISBN: 9798617085725Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Dzyaloshinskii moriya

High Frequency Magnetization Dynamics Affecting Parallel Pumping, Reﬂectivity and Thermal Properties of Magnets.
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520 $a The world is increasingly dependent on magnetic systems for many devices, from data storage in hard disk drives to information transfer and logical operations, to signal processing and more. As these technologies proliferate throughout our lives, the next generation of magnetic devices are in high demand as the amount of information and data to be stored, transferred, etc. skyrockets. The large tunability of many magnetic systems make them ideal candidates for meeting this demand as fabrication techniques on the nanometer scale become more sophisticated. In this dissertation, the magnetization dynamics for various nanometer-scale magnetic systems are studied. For example, as the band gap from 1-10 GHz is ﬁlled with more wireless devices, there is a desire to develop new technologies that can operate in the frequency regime from 10-1000 GHz. In chapter II, we show how alternating stacks of ultrathin layers of ferromagnetic and non-magnetic materials can exhibit resonance frequencies in the far-infrared frequency regime.As magnetic systems are fabricated on smaller and smaller scales, it is important to understand how different interactions affect the performance of these devices. In chapter III, we explore how the dipolar ﬁeld in a rectangular nanostripe affects the spin waves that are excited. These spin wave excitations are of interest because they provide an alternative to electronic-based devices, which are susceptible to Joule heating at small length scales. We explore how a rectangular ferromagnetic nanostripe in the parallel pumping geometry can produce off-resonance spin waves as well as backward volume magnetostatic spin waves. Another effect which is observed in ultrathin magnetic ﬁlms is the interfacial antisymmetric exchange interaction, which competes with the symmetric exchange interaction to dramatically alter the spectrum of excited spin waves. While this interaction has been known for several decades, there have been few studies on these systems when thermal ﬂuctuations are included. In chapter IV we explore how these thermal ﬂuctuations affect the average magnetization in an ultrathin ﬁlm with and without the antisymmetric exchange interaction. At the end of each chapter, we present conclusions and a future outlook for the potential applications of each magnetic system.
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