Type

Journal Article

Authors

Roger W. Whatmore
Martyn E. Pemble
Michael Schmidt
Clive Downing
Valeria Nicolosi
Lynette Keeney

Subjects

Physics

Topics
scale stabilization ferroelectrics oxides partition morphology aurivillius phase complex neighborhoods site percolation thresholds material lattice site direct determination room temperature thin films long range order bi5feti3o15 high resolution

Direct atomic scale determination of magnetic ion partition in a room temperature multiferroic material (2017)

Abstract The five-layer Aurivillius phase Bi6TixFeyMnzO18 system is a rare example of a single-phase room temperature multiferroic material. To optimise its properties and exploit it for future memory storage applications, it is necessary to understand the origin of the room temperature magnetisation. In this work we use high resolution scanning transmission electron microscopy, EDX and EELS to discover how closely-packed Ti/Mn/Fe cations of similar atomic number are arranged, both within the perfect structure and within defect regions. Direct evidence for partitioning of the magnetic cations (Mn and Fe) to the central three of the five perovskite (PK) layers is presented, which reveals a marked preference for Mn to partition to the central layer. We infer this is most probably due to elastic strain energy considerations. The observed increase (>8%) in magnetic cation content at the central PK layers engenders up to a 90% increase in potential ferromagnetic spin alignments in the central layer and this could be significant in terms of creating pathways to the long-range room temperature magnetic order observed in this distinct and intriguing material system.
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Full list of authors on original publication

Roger W. Whatmore, Martyn E. Pemble, Michael Schmidt, Clive Downing, Valeria Nicolosi, Lynette Keeney

Experts in our system

1
Roger W. Whatmore
University College Cork
Total Publications: 23
 
2
Martyn E. Pemble
University College Cork
Total Publications: 43
 
3
Michael Schmidt
University College Cork
Total Publications: 42
 
4
Clive Downing
Trinity College Dublin
Total Publications: 11
 
5
Valeria Nicolosi
Trinity College Dublin
Total Publications: 67
 
6
Lynette Keeney
University College Cork
Total Publications: 22