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

doi:10.1063/1.1712035

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	3106-3108
Number of pages	3
Journal	Applied Physics Letters
Volume	84
Issue number	16
DOIs	https://doi.org/10.1063/1.1712035
Publication status	Published - 2004 Apr 19
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "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.",

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AU - Ernult, F.

AU - Yamane, K.

AU - Mitani, S.

AU - Yakushiji, K.

AU - Takanashi, K.

AU - Takahashi, Y. K.

AU - Hono, K.

PY - 2004/4/19

Y1 - 2004/4/19

N2 - 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.

AB - 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.

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

Abstract

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