@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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    <dc:creator>Cramm, Stefan</dc:creator>
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    <dc:creator>Müller, Martina</dc:creator>
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    <dc:creator>Hoppe, Michael</dc:creator>
    <dcterms:abstract xml:lang="eng">We investigate the sensitive interplay between magnetic, electronic and structural properties in the ferrimagnetic oxide NiFe2&lt;sub&gt;2&lt;/sub&gt;2O4&lt;sub&gt;4&lt;/sub&gt;4. Emphasis is placed on the impact of reduced dimensionality in the crossover from bulk-like to ultrathin films. We observed an enhanced saturation magnetization MS&lt;sub&gt;S&lt;/sub&gt;S for ultrathin NiFe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; films on Nb-SrTiO&lt;sub&gt;3&lt;/sub&gt; (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 NiFe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; film thickness -- thus ruling out a cationic inversion that nominally could account for an enhanced MS&lt;sub&gt;S&lt;/sub&gt;S. Our study instead uncovers a reduction of the unit cell volume, i.e. an auxetic behavior in ultrathin NiFe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; films, which may result in an enhanced magnetic exchange caused by an increased interatomic electronic localization.</dcterms:abstract>
    <dc:contributor>Müller, Martina</dc:contributor>
    <dcterms:title>Enhanced ferrimagnetism in auxetic NiFe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; in the crossover to the ultrathin-film limit</dcterms:title>
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    <dc:contributor>Hoppe, Michael</dc:contributor>
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    <dc:creator>Gorgoi, Mihaela</dc:creator>
    <dc:contributor>Gorgoi, Mihaela</dc:contributor>
    <dc:contributor>Cramm, Stefan</dc:contributor>
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