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Theorizing Hidden Chemical and Magne...

Walsh, Flynn.

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Theorizing Hidden Chemical and Magnetic Order in Alloys.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Theorizing Hidden Chemical and Magnetic Order in Alloys./
Author:	Walsh, Flynn.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	62 p.
Notes:	Source: Dissertations Abstracts International, Volume: 85-06, Section: B.
Contained By:	Dissertations Abstracts International85-06B.
Subject:	Materials science. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30528025
ISBN:	9798380877473

Theorizing Hidden Chemical and Magnetic Order in Alloys.
Walsh, Flynn.

Theorizing Hidden Chemical and Magnetic Order in Alloys. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 62 p.

Source: Dissertations Abstracts International, Volume: 85-06, Section: B.

Thesis (Ph.D.)--University of California, Berkeley, 2023.

The popularization of concentrated solid-solution alloys has prompted a renewed search for atomic-scale chemical order among elements that appear randomly distributed within crystal lattices. However, confounding signals in electron diffraction experiments necessitate an immediate reliance on indirect measurements for detecting local order in compositionally complex alloys, as may be interpreted through computer simulations. For instance, both the structure and magnetization of the CrCoNi model system notably contradict ab initio theory for random alloys, but could be reconciled by the widespread presence of chemical short-range order. These simulations additionally find significant magnetic interactions in materials that are often assumed only paramagnetic, motivating further predictions of antiferromagnetism in binary Cr-Ni alloys, which are conventionally understood to have nonmagnetic ground states. This result indicates either the failure of standard theories or, as suggested by anomalous historical measurements, the existence of previously overlooked magnetic order that could persist well above ambient temperatures. In order to realistically model magnetic thermodynamics, a new Monte Carlo approach is developed and found to provide insight into the origin and prevalence of magnetic short-range order.

ISBN: 9798380877473Subjects--Topical Terms:

543314
Materials science.
Subjects--Index Terms:

Chemical order

Theorizing Hidden Chemical and Magnetic Order in Alloys.
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100 1 $a Walsh, Flynn. $3 3773844
245 1 0 $a Theorizing Hidden Chemical and Magnetic Order in Alloys.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 62 p.
500 $a Source: Dissertations Abstracts International, Volume: 85-06, Section: B.
500 $a Advisor: Asta, Mark.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2023.
520 $a The popularization of concentrated solid-solution alloys has prompted a renewed search for atomic-scale chemical order among elements that appear randomly distributed within crystal lattices. However, confounding signals in electron diffraction experiments necessitate an immediate reliance on indirect measurements for detecting local order in compositionally complex alloys, as may be interpreted through computer simulations. For instance, both the structure and magnetization of the CrCoNi model system notably contradict ab initio theory for random alloys, but could be reconciled by the widespread presence of chemical short-range order. These simulations additionally find significant magnetic interactions in materials that are often assumed only paramagnetic, motivating further predictions of antiferromagnetism in binary Cr-Ni alloys, which are conventionally understood to have nonmagnetic ground states. This result indicates either the failure of standard theories or, as suggested by anomalous historical measurements, the existence of previously overlooked magnetic order that could persist well above ambient temperatures. In order to realistically model magnetic thermodynamics, a new Monte Carlo approach is developed and found to provide insight into the origin and prevalence of magnetic short-range order.
590 $a School code: 0028.
650 4 $a Materials science. $3 543314
650 4 $a Applied physics. $3 3343996
650 4 $a Physics. $3 516296
653 $a Chemical order
653 $a Magnetic order
653 $a Alloys
653 $a Electron diffraction
690 $a 0794
690 $a 0215
690 $a 0605
710 2 $a University of California, Berkeley. $b Applied Science & Technology. $3 3352385
773 0 $t Dissertations Abstracts International $g 85-06B.
790 $a 0028
791 $a Ph.D.
792 $a 2023
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30528025