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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Valant et al. (2010) studied this question.
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