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
Zusammenfassung

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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    <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>
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