Large magnetoelectric coupling in nanoscale BiFeO3 from direct electrical measurements

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Date
2014-09-02
Authors
Goswami, Sudipta
Bhattacharya, Dipten
Keeney, Lynette
Maity, Tuhin
Kaushik, S. D.
Siruguri, V.
Das, Gopes C.
Yang, Haifang
Li, Wuxia
Gu, Chang-zhi
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American Physical Society
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Abstract
We report the results of direct measurement of remanent hysteresis loops on nanochains of BiFeO3 at room temperature under zero and ∼20 kOe magnetic field. We noticed a suppression of remanent polarization by nearly ∼40% under the magnetic field. The powder neutron diffraction data reveal significant ion displacements under a magnetic field which seems to be the origin of the suppression of polarization. The isolated nanoparticles, comprising the chains, exhibit evolution of ferroelectric domains under dc electric field and complete 180 switching in switching-spectroscopy piezoresponse force microscopy. They also exhibit stronger ferromagnetism with nearly an order of magnitude higher saturation magnetization than that of the bulk sample. These results show that the nanoscale BiFeO3 exhibits coexistence of ferroelectric and ferromagnetic order and a strong magnetoelectric multiferroic coupling at room temperature comparable to what some of the type-II multiferroics show at a very low temperature.
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Keywords
Capacitors , Films , Nanochains , ferromagnetism , Multiferroic coupling
Citation
Goswami, S., Bhattacharya, D., Keeney, L., Maity, T., Kaushik, S. D., Siruguri, V., Gopes D. C., Yang, H., Li, W., Gu, C., Pemble, M. E., Roy, S. (2014) 'Large magnetoelectric coupling in nanoscale BiFeO3 from direct electrical measurements', Physical Review B, 90, 104402. http://link.aps.org/doi/10.1103/PhysRevB.90.104402
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© 2014 American Physical Society.