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Magnetite (Fe3O4) films were fabricated on MgAl2O4 (001) single crystalsubstrates by pulsed laser deposition. In-plane and out-of-plane latticeconstants were determined by X-ray diffraction. The apparent Poisson's ratiowas determined as the negative ratio of the out-of-plane to in-plane strains.The results show that (i) the determination of Poisson's ratio by this methodis only reliable for fully strained films and (ii) Poisson's ratio = 0.3 alongthe <100> direction is positive for this archetypal ferrite. Fe3O4 films grownon MgAl2O4 (001) are not auxetic.

Are magnetite (Fe3O4) films on MgAl2O4 auxetic?