Spin-dependent single-electron-tunneling effects in epitaxial Fe nanoparticles

F. Ernult, K. Yamane, S. Mitani, K. Yakushiji, K. Takanashi, Y. K. Takahashi, K. Hono

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The preparation of Fe/MgO/Fe nanoparticles/MgO/Co double tunnel junctions by molecular beam epitaxy, for current-perpendicular-to-plane transport measurements on submicrometer-sized pillars, was discussed. The microstructural observations indicates that the samples exhibit a fully epitaxial layered structure with sharp and flat interfaces including separated Fe nanoparticles between the barriers. It was shown that the introduction of asymmetric MgO tunnel barrier, with different thickness, in the double junction leads to a clear observation of Coulomb staircase and associated tunnel magnetoresistance oscillations. Estimation of the capacitance of the system indicates that these transport phenomena were due to charging effects of the magnetic particles.

Original languageEnglish
Pages (from-to)3106-3108
Number of pages3
JournalApplied Physics Letters
Issue number16
Publication statusPublished - 2004 Apr 19

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Ernult, F., Yamane, K., Mitani, S., Yakushiji, K., Takanashi, K., Takahashi, Y. K., & Hono, K. (2004). Spin-dependent single-electron-tunneling effects in epitaxial Fe nanoparticles. Applied Physics Letters, 84(16), 3106-3108. https://doi.org/10.1063/1.1712035