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Exchange bias on polycrystalline BiFeO3/Co2Fe(Al0.5Si0.5) heterostructures

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Abstract

Polycrystalline antiferromagnetic BiFeO3 (BFO) thin films were grown on Si/SiO2/Ti/Pt (111) substrates by pulsed laser deposition and then ferromagnetic films Co2Fe(Al0.5Si0.5) (CFAS) by magnetron sputtering. After fabrication, the films were vacuum-annealed under a 0.1-T magnetic field at different temperatures from 150 to 500 °C. The exchange bias field can be tuned by the annealing temperature for the heterostructures, and the electric domain size can be controlled by the crystal grain size. A large exchange bias of about 5 × 10−3 T is observed in one of the samples. It can be speculated that the crystal grain sizes are the key element in determining the exchange bias and coercivity of the films annealed at the temperature of higher than Neel temperature (T N) of BFO. Furthermore, it is possible to extend spin theories from single-crystal BFO system to polycrystalline BFO system.

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Acknowledgments

This study was financially supported by the National Basic Research Program of China (Nos. 2012CB932702 and 2015CB921502) and the National Natural Science Foundation of China (Nos. 11174031, 51371024, 51325101, 51271020, and 51471029).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Shi-Zhe Wu, Yong Wu, Shao-Qian Yin, Xiao-Guang Xu, Jun Miao & Yong Jiang

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  1. Shi-Zhe Wu
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  2. Yong Wu
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  4. Xiao-Guang Xu
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Correspondence to Xiao-Guang Xu.

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Wu, SZ., Wu, Y., Yin, SQ. et al. Exchange bias on polycrystalline BiFeO3/Co2Fe(Al0.5Si0.5) heterostructures. Rare Met. 36, 32–36 (2017). https://doi.org/10.1007/s12598-016-0697-4

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  • DOI: https://doi.org/10.1007/s12598-016-0697-4

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