Magnetic study of Lu(Fe0.2Mn0.2Co0.2Cr0.2Ni0.2)O3 high entropy oxide thin films
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Perustieteiden korkeakoulu |
Master's thesis
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Authors
Date
2022-10-18
Department
Major/Subject
Engineering Physics
Mcode
SCI3056
Degree programme
Master’s Programme in Engineering Physics
Language
en
Pages
47+2
Series
Abstract
The aim of this thesis project is to study the structural and magnetic properties of Lu(Fe0.2Mn0.2Co0.2Cr0.2Ni0.2)O3 (Lu5BO) high-entropy oxide perovskite (HEOP) thin films. After having obtained and optimized the growth of the film, its structural properties have been characterized, proving that the epitaxial single-phase film has excellent crystallinity, smooth surface and uniform mixing of the 3d transition metals in the B sublattice. The overall magnetic properties of the film have been studied through the use of VSM SQUID magnetometry and an element-specific study was carried out through synchrotron-based X-ray absorption spectroscopy (XAS, XMCD and XLD), revealing dominant antiferromagnetic order with weak ferromagnetic clusters given by Mn4+–O–Ni2+ superexchange interaction. This project demonstrates the strength of entropy stabilization as a material design technique, applicable also to the realization of HEOPs thin films with rare- earth ions with small atomic radii and provides new insight on the manipulation of ferroic properties in HEOPs thin films.Description
Supervisor
van Dijken, SebastiaanThesis advisor
Farhan, AlanKeywords
high entropy oxide, magnetism, thin film, perovskites