Jump to main content
Jump to site search


Thermal phase design of ultrathin magnetic iron oxide films: from Fe3O4 to γ-Fe2O3 and FeO

Author affiliations

Abstract

We demonstrate the thermally induced phase transformations between Fe3O4, γ-Fe2O3 and FeO ultrathin iron oxide films, which are part of all-oxide heterostructures, and present a comprehensive thermodynamic analysis of the emerging interfacial redox processes. We thereby reveal the essential – but mostly underrated – role of oxide substrates, which can completely alter the standard FexOy temperature–pressure phase diagram as an additional oxygen supplier or scavenger. We introduce an adjusted phase diagram specifically for FexOy/Nb:SrTiO3 and FexOy/YSZ heterostructures based on a total effective oxygen activity. This novel approach opens up the route towards tuning physical functionalities in all-oxide heterostructures by a controlled thermal phase design.

Graphical abstract: Thermal phase design of ultrathin magnetic iron oxide films: from Fe3O4 to γ-Fe2O3 and FeO

Back to tab navigation

Supplementary files

Article information


Submitted
30 Oct 2019
Accepted
02 Dec 2019
First published
13 Dec 2019

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Thermal phase design of ultrathin magnetic iron oxide films: from Fe3O4 to γ-Fe2O3 and FeO

M. H. Hamed, D. N. Mueller and M. Müller, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05921K

Social activity

Search articles by author

Spotlight

Advertisements