Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 20, Issue 4, Pages 644-647Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200901762
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Funding
- Engineering and Physical Sciences Research Council [EP/F015518/1] Funding Source: researchfish
- EPSRC [EP/F015518/1] Funding Source: UKRI
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In functional oxide materials so-called molecular auxetic behavior is extremely rare. Here, it is reported in the CoFe(2)O(4) spinel structure. A CoFe(2)O(4) epitaxial thin film under compressive axial strain also reduces its cell dimensions in the transverse direction with a Poisson's ratio of -0.85. A hinge-like honeycomb network in the spinel structure is identified as being responsible for the negative Poisson's ratio. This phenomenon has a substantial effect on the functional properties of CoFe(2)O(4) and enables the construction of a new class of nano-devices.
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