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

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2015

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Hoppe, Michael
Döring, Sven
Gorgoi, Mihaela
Cramm, Stefan

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Physical Review B. American Physical Society (APS). 2015, 91(5), 054418. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.91.054418

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We investigate the sensitive interplay between magnetic, electronic and structural properties in the ferrimagnetic oxide NiFe222O444. Emphasis is placed on the impact of reduced dimensionality in the crossover from bulk-like to ultrathin films. We observed an enhanced saturation magnetization MSSS for ultrathin NiFe2O4 films on Nb-SrTiO3 (001) substrates that co-occurs with a reduced out-of-plane lattice constant under compressive in-plane epitaxial strain. We found a bulk-like cationic coordination of the inverse spinel lattice independent of the NiFe2O4 film thickness -- thus ruling out a cationic inversion that nominally could account for an enhanced MSSS. Our study instead uncovers a reduction of the unit cell volume, i.e. an auxetic behavior in ultrathin NiFe2O4 films, which may result in an enhanced magnetic exchange caused by an increased interatomic electronic localization.

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ISO 690HOPPE, Michael, Sven DÖRING, Mihaela GORGOI, Stefan CRAMM, Martina MÜLLER, 2015. Enhanced ferrimagnetism in auxetic NiFe2O4 in the crossover to the ultrathin-film limit. In: Physical Review B. American Physical Society (APS). 2015, 91(5), 054418. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.91.054418
BibTex
@article{Hoppe2015Enhan-49738,
  year={2015},
  doi={10.1103/PhysRevB.91.054418},
  title={Enhanced ferrimagnetism in auxetic NiFe<sub>2</sub>O<sub>4</sub> in the crossover to the ultrathin-film limit},
  number={5},
  volume={91},
  issn={2469-9950},
  journal={Physical Review B},
  author={Hoppe, Michael and Döring, Sven and Gorgoi, Mihaela and Cramm, Stefan and Müller, Martina},
  note={Article Number: 054418}
}
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