Self-alignment of Fe nanoparticles on a tunnel barrier

F. Ernult, S. Mitani, K. Takanashi, Y. K. Takahashi, K. Hono, Y. Takahashi, E. Matsubara

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Nanometric metallic particles were prepared on top of a thin epitaxial oxide layer. Samples with the following structure: Fe electrodeMgOFe particles were fabricated and the arrangement of the Fe particles could be tuned from random to self-aligned by simply varying the thickness of the Fe electrode. Under appropriate deposition conditions, the particles were found to be self-aligned along the 〈110〉 directions of the underlying Fe electrode. Scanning tunneling microscope (STM) showed that their mean diameter and size distribution were then significantly reduced compared to randomly organized particles. Transmission electron microscope (TEM) images indicated that the self-alignment process originates from the strain relaxation of the Fe electrode which favors faceting of its surface and the formation of pyramidal structures. These self-aligned particles may be straightly used for applications based on a thin oxide tunnel barrier such as single-electron tunneling devices.

Original languageEnglish
Article number033115
JournalApplied Physics Letters
Volume87
Issue number3
DOIs
Publication statusPublished - 2005 Jul 18

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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