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We investigate the sensitive interplay between magnetic, electronic andstructural properties in the ferrimagnetic oxide NiFe2O4. Emphasis is placed onthe impact of reduced dimensionality in the crossover from bulk-like toultrathin films. We observed an enhanced saturation magnetization $M_S$ forultrathin NiFe2O4 films on Nb-SrTiO3 (001) substrates that co-occurs with areduced out-of-plane lattice constant under compressive in-plane epitaxialstrain. We found a bulk-like cationic coordination of the inverse spinellattice independent of the NiFe2O4 film thickness -- thus ruling out a cationicinversion that nominally could account for an enhanced $M_S$. Our study insteaduncovers a reduction of the unit cell volume, i.e. an auxetic behavior inultrathin NiFe2O4 films, which may result in an enhanced magnetic exchangecaused by an increased interatomic electronic localization.

Enhanced ferrimagnetism in auxetic NiFe2O4 in the crossover to the ultrathin film limit