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

被引：21
|
作者：
Hamed, Mai Hussein [1 ,2 ]
Mueller, David N. [1 ]
Mueller, Martina [1 ,3 ]
机构：
[1] Forschungszentrum Julich, Peter Grunberg Inst PGI6, D-52425 Julich, Germany
[2] Helwan Univ, Fac Sci, Cairo 11795, Egypt
[3] Tech Univ Dortmund, Expt Phys 1, D-44227 Dortmund, Germany
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2020年 / 8卷 / 04期
关键词：
OXYGEN; GROWTH;
D O I：
10.1039/c9tc05921k
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We demonstrate the thermally induced phase transformations between Fe3O4, gamma-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.
引用
收藏
页码：1335 / 1343
页数：9
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