Uncompensated spins in exchange-biased BiFeO3/γ-Fe2O3 core/shell-like thin films

We have investigated the uncompensated spins in exchange-biased BiFeO3/γ-Fe2O3 core/shell-like thin films. For both in-plane and out-of-plane directions of the films, clear exchange bias appears and coercive field asymmetrically changes with respect to the annealing temperature and the cycling of ma...

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Bibliographic Details
Published in:Journal of applied physics 2013-09, Vol.114 (10)
Main Authors: Sung, K. D., Park, Y. A., Kim, Ki-Yeon, Hur, N., Jung, J. H.
Format: Article
Language:English
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Summary:We have investigated the uncompensated spins in exchange-biased BiFeO3/γ-Fe2O3 core/shell-like thin films. For both in-plane and out-of-plane directions of the films, clear exchange bias appears and coercive field asymmetrically changes with respect to the annealing temperature and the cycling of magnetic field. These results can be explained by the different characters of two types of uncompensated spins. The uncompensated spins at antiferromagnetic domain-walls (rough interface) are weakly (strongly) affected by the external magnetic field. The control of uncompensated spins at domain-walls is crucial in order to realize exchange bias at room temperature along the out-of-plane direction of BiFeO3/γ-Fe2O3 core/shell-like thin films.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4821029