東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

High Frequency Magnetization Dynamic...

Yarbrough, Patrick.

FindBook

Google Book

Amazon

博客來

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

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	High Frequency Magnetization Dynamics Affecting Parallel Pumping, Reﬂectivity and Thermal Properties of Magnets./
作者:	Yarbrough, Patrick.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	132 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
Contained By:	Dissertations Abstracts International81-12B.
標題:	Physics. -
電子資源:	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.
LDR:03581nmm a2200385 4500 001 2279709
005 20210823083424.5
008 220723s2020 ||||||||||||||||| ||eng d
020 $a 9798617085725
035 $a (MiAaPQ)AAI27994512
035 $a AAI27994512
040 $a MiAaPQ $c MiAaPQ
100 1 $a Yarbrough, Patrick. $3 3558182
245 1 0 $a High Frequency Magnetization Dynamics Affecting Parallel Pumping, Reﬂectivity and Thermal Properties of Magnets.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 132 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-12, Section: B.
500 $a Advisor: Livesey, Karen.
502 $a Thesis (Ph.D.)--University of Colorado Colorado Springs, 2020.
506 $a This item must not be sold to any third party vendors.
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.
590 $a School code: 0892.
650 4 $a Physics. $3 516296
650 4 $a Nanoscience. $3 587832
650 4 $a Condensed matter physics. $3 3173567
653 $a Dzyaloshinskii moriya
653 $a Effective medium theory
653 $a Green's function
653 $a Infrared
653 $a Magnetism
653 $a Spin waves
690 $a 0605
690 $a 0565
690 $a 0611
710 2 $a University of Colorado Colorado Springs. $b College of Letters, Arts, and Sciences-Physics. $3 3558183
773 0 $t Dissertations Abstracts International $g 81-12B.
790 $a 0892
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27994512