Flexible Epsilon Iron Oxide Thin Films

Tahta Amrillah, Le Thi Quynh, Chien Nguyen Van, Thi Hien Do, Elke Arenholz, Jenh Yih Juang, Ying Hao Chu

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Metastable ϵ-Fe2O3 is a unique phase of iron oxide, which exhibits a giant coercivity field. In this work, we grew epitaxial ϵ-Fe2O3 films on flexible two-dimensional muscovite substrates via quasi van der Waals epitaxy. It turns out that twinning and interface energies have been playing essential roles in stabilizing metastable ϵ-Fe2O3 on mica substrates. Moreover, the weak interfacial bonding between ϵ-Fe2O3 and mica is expected to relieve the substrate clamping effect ubiquitously encountered in films epitaxially grown on rigid substrates, such as SrTiO3. It is anticipated that these flexible ϵ-Fe2O3 thin films can serve as a platform for exploring possible interesting emergent physical properties and eventually be integrated as flexible functional devices.

Original languageEnglish
Pages (from-to)17006-17012
Number of pages7
JournalACS Applied Materials and Interfaces
Issue number14
Publication statusPublished - 14 Apr 2021


  • flexible device
  • flexible epsilon iron film
  • giant coercivity field
  • quasi van der Waals epitaxy
  • ϵ-FeO


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