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Mediating exchange bias by Verwey transition in CoO/Fe3O4 thin film

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Liu,  X. H.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Chang,  C. F.
Chun-Fu Chang, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Liu, X. H., Liu, W., Zhang, Z. D., & Chang, C. F. (2018). Mediating exchange bias by Verwey transition in CoO/Fe3O4 thin film. Journal of Applied Physics, 123(8): 083903, pp. 1-5. doi:10.1063/1.5023725.


Cite as: http://hdl.handle.net/21.11116/0000-0001-2254-A
Abstract
We report the tunability of the exchange bias effect by the first-order metal-insulator transition (known as the Verwey transition) of Fe3O4 in CoO (5 nm)/Fe3O4 (40 nm)/MgO (001) thin film. In the vicinity of the Verwey transition, the exchange bias field is substantially enhanced because of a sharp increase in magnetocrystalline anisotropy constant from high-temperature cubic to low-temperature monoclinic structure. Moreover, with respect to the Fe3O4 (40 nm)/MgO (001) thin film, the coercivity field of the CoO (5 nm)/Fe3O4 (40 nm)/MgO (001) bilayer is greatly increased for all the temperature range, which would be due to the coupling between Co spins and Fe spins across the interface. Published by AIP Publishing.