Enhanced magnetic moment in ultrathin Fe-doped CoFe2O4films
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ID: 272871
2012
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Abstract
The effect of film thickness on the magnetic properties of ultrathin Fe-doped cobalt ferrite (Co1−xFe2+xO4) grown on MgO (001) substrates is investigated by superconducting quantum interference device magnetometry and x-ray magnetic linear dichroism, while the distribution of the Co2+ cations between the octahedral and tetrahedral lattice sites is studied with x-ray absorption spectroscopy. For films thinner than 10 nm, there is a large enhancement of the magnetic moment; conversely, the remanent magnetization and coercive fields both decrease, while the magnetic spin axes of all the cations become less aligned with the [001] crystal direction. In particular, at 300 K the coercive fields of the thinnest films vanish. The spectroscopy data show that no changes occur in the cation distribution as a function of film thickness, ruling this out as the origin of the enhanced magnetic moment. However, the magnetic measurements all support the possibility that these ultrathin Fe-doped CoFe2O4 films are transitioning into a superparamagnetic state, as has been seen in ultrathin Fe3O4. A weakening of the magnetic interactions at the antiphase boundaries, leading to magnetically independent domains within the film, could explain the enhanced magnetic moment in ultrathin Fe-doped CoFe2O4 and the onset of superparamagnetism at room temperature.
| Reference Key |
henrich2012physicalenhanced
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| Authors | J. A. Moyer,C. A. F. Vaz,Divine Kumah,D. A. Arena,V. E. Henrich;J. A. Moyer;C. A. F. Vaz;Divine Kumah;D. A. Arena;V. E. Henrich; |
| Journal | physical review b |
| Year | 2012 |
| DOI |
10.1103/physrevb.86.174404
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