Aberration corrected STEM of iron rhodium nanoislands

Iron-rhodium (FeRh) nanoislands of equiatomic composition have been analysed using scanning transmission electron microscopy (STEM) electron energy loss spec-troscopy(EELS) and high angle annular dark field (HAADF) techniques. Previous magne-tometry results have lead to a hypothesis that at room tem...

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Bibliographic Details
Published in:Journal of physics. Conference series 2014-01, Vol.522 (1), p.12039-4
Main Authors: McLaren, M J, Hage, F S, Loving, M, Ramasse, Q M, Lewis, L H, Marrows, C H, Brydson, R M D
Format: Article
Language:English
Subjects:
Antiferromagnetism
Composition
Composition effects
Electron energy loss spectroscopy
Energy dissipation
Ferromagnetic materials
Ferromagnetism
Iron
Islands
Nanostructure
Physics
Rhodium
Room temperature
Scanning transmission electron microscopy
Substrates
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Summary:Iron-rhodium (FeRh) nanoislands of equiatomic composition have been analysed using scanning transmission electron microscopy (STEM) electron energy loss spec-troscopy(EELS) and high angle annular dark field (HAADF) techniques. Previous magne-tometry results have lead to a hypothesis that at room temperature the core of the islands are antiferromagnetic while the shell has a small ferromagnetic signal. The causes of this effect are most likely to be a difference in composition at the edges or a strain on the island that stretches the lattice and forces the ferromagnetic transition. The results find, at the film-substrate interface, an iron-rich layer ~ 5 Å thick that could play a key role in affecting the magnetostructural transition around the interfacial region and account for the room temperature ferromagnetism.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/522/1/012039