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@ARTICLE{Hoppe:203511,
      author       = {Hoppe, Michael and Döring, Sven and Gorgoi, Mihaela and
                      Cramm, Stefan and Müller, Martina},
      title        = {{E}nhanced ferrimagnetism in auxetic
                      {N}i{F}e$_{2}${O}$_{4}$ in the crossover to the
                      ultrathin-film limit},
      journal      = {Physical review / B},
      volume       = {91},
      number       = {5},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-05431},
      pages        = {054418},
      year         = {2015},
      abstract     = {We investigate the sensitive interplay between magnetic,
                      electronic, and structural properties in the ferrimagnetic
                      oxide NiFe2O4. 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
                      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 MS. Moreover, our study instead uncovers a
                      reduction of the unit cell volume, i.e., an auxetic behavior
                      in ultrathin NiFe2O4 films.},
      cin          = {PGI-6},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {522 - Controlling Spin-Based Phenomena (POF3-522)},
      pid          = {G:(DE-HGF)POF3-522},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000350102600001},
      doi          = {10.1103/PhysRevB.91.054418},
      url          = {https://juser.fz-juelich.de/record/203511},
}