Flexible Heteroepitaxy of CoFe2O4/Muscovite Bimorph with Large Magnetostriction

Heng Jui Liu, Chih Kuo Wang, Dong Su, Tahta Amrillah, Ying Hui Hsieh, Kun Hong Wu, Yi Chun Chen, Jenh-Yih Juang, Lukas M. Eng, Shien Uang Jen*, Ying-hao Chu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

A bimorph composed of ferrimagnetic cobalt ferrite (CoFe2O4, CFO) and flexible muscovite was fabricated via van der Waals epitaxy. The combination of X-ray diffraction and transmission electron microscopy was conducted to reveal the heteroepitaxy of the CFO/muscovite system. The robust magnetic behaviors against mechanical bending were characterized by hysteresis measurements and magnetic force microscopy, which maintain a saturation magnetization (Ms) of ∼120-150 emu/cm3 under different bending states. The large magnetostrictive response of the CFO film was then determined by digital holographic microscopy, where the difference of magnetostrction coefficient (δ λ) is -104 ppm. The superior performance of this bimorph is attributed to the nature of weak interaction between film and substrate. Such a flexible CFO/muscovite bimorph provides a new platform to develop next-generation flexible magnetic devices.

Original languageEnglish
Pages (from-to)7297-7304
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number8
DOIs
StatePublished - 1 Mar 2017

Keywords

  • cobalt ferrite (CoFeO)
  • flexible magnetic devices
  • magnetostriction
  • muscovite (mica)
  • van der Waals epitaxy

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