Epitaxial iron oxide nanocrystals with memory function grown on Si substrates

Takafumi Ishibe, Hideki Matsui, Kentaro Watanabe, Shotaro Takeuchi, Akira Sakai, Yoshiaki Nakamura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


High-density Fe3O4-δ nanocrystals (NCs) were epitaxially grown on Si substrates by molecular beam epitaxy with epitaxial Ge NCs being used as nucleation sites. Scanning tunneling spectroscopy measurements showed that the surface bandgap of the as-grown Fe3O4-δ NCs was ~0.2 eV, consistent with that reported for Fe3O4-δ films. Conductive atomic force microscopy measurements of the NCs revealed hysteresis in the voltage- current curves, indicating bipolar resistive switching behavior. The measurement results established the superiority of the NCs to thin conventional polycrystalline Fe3O4-δ films/Si in terms of resistive switching characteristics. This demonstrated the possibility of developing resistance random access memory devices composed of ubiquitous Fe3O4-δ NC materials.

Original languageEnglish
Article number055508
JournalApplied Physics Express
Issue number5
Publication statusPublished - 2016 May
Externally publishedYes

ASJC Scopus subject areas

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


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