Abstract
We have investigated the uncompensated spins in exchange-biased BiFeO 3/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-Fe 2O3 core/shell-like thin films.
Original language | English |
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Article number | 103902 |
Journal | Journal of Applied Physics |
Volume | 114 |
Issue number | 10 |
DOIs | |
State | Published - 14 Sep 2013 |
Bibliographical note
Funding Information:The authors thank Professor B. C. Lee for helpful discussions. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0067350 and 2012R1A1A2002536).