Flexible Multiferroic Bulk Heterojunction with Giant Magnetoelectric Coupling via van der Waals Epitaxy

Tahta Amrillah, Yugandhar Bitla, Kwangwoo Shin, Tiannan Yang, Ying Hui Hsieh, Yu You Chiou, Heng Jui Liu, Thi Hien Do, Dong Su, Yi Chun Chen, Shien Uang Jen, Long Qing Chen, Kee Hoon Kim, Jenh Yih Juang, Ying Hao Chu

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Abstract

Magnetoelectric nanocomposites have been a topic of intense research due to their profound potential in the applications of electronic devices based on spintronic technology. Nevertheless, in spite of significant progress made in the growth of high-quality nanocomposite thin films, the substrate clamping effect still remains a major hurdle in realizing the ultimate magnetoelectric coupling. To overcome this obstacle, an alternative strategy of fabricating a self-assembled ferroelectric-ferrimagnetic bulk heterojunction on a flexible muscovite via van der Waals epitaxy is adopted. In this study, we investigated the magnetoelectric coupling in a self-assembled BiFeO3 (BFO)-CoFe2O4 (CFO) bulk heterojunction epitaxially grown on a flexible muscovite substrate. The obtained heterojunction is composed of vertically aligned multiferroic BFO nanopillars embedded in a ferrimagnetic CFO matrix. Moreover, due to the weak interaction between the flexible substrate and bulk heterojunction, the interface is incoherent and, hence, the substrate clamping effect is greatly reduced. The phase-field simulation model also complements our results. The magnetic and electrical characterizations highlight the improvement in magnetoelectric coupling of the BFO-CFO bulk heterojunction. A magnetoelectric coupling coefficient of 74 mV/cm·Oe of this bulk heterojunction is larger than the magnetoelectric coefficient reported earlier on flexible substrates. Therefore, this study delivers a viable route of fabricating a remarkable magnetoelectric heterojunction and yet flexible electronic devices that are robust against extreme conditions with optimized performance.

Original languageEnglish (US)
Pages (from-to)6122-6130
Number of pages9
JournalACS nano
Volume11
Issue number6
DOIs
StatePublished - Jun 27 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Amrillah, T., Bitla, Y., Shin, K., Yang, T., Hsieh, Y. H., Chiou, Y. Y., Liu, H. J., Do, T. H., Su, D., Chen, Y. C., Jen, S. U., Chen, L. Q., Kim, K. H., Juang, J. Y., & Chu, Y. H. (2017). Flexible Multiferroic Bulk Heterojunction with Giant Magnetoelectric Coupling via van der Waals Epitaxy. ACS nano, 11(6), 6122-6130. https://doi.org/10.1021/acsnano.7b02102