Tunnel magnetoresistance oscillations in current perpendicular to plane geometry of CoAlO granular thin films

K. Yakushiji; S. Mitani; K. Takanashi; H. Fujimori

doi:10.1063/1.1447189

Tunnel magnetoresistance oscillations in current perpendicular to plane geometry of CoAlO granular thin films

K. Yakushiji, S. Mitani, K. Takanashi, H. Fujimori

Collaborative Research Center on Energy Materials

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

46 Citations (Scopus)

Abstract

We have fabricated current-perpendicular-to-plane geometry samples consisting of a thin CoAlO granular film sandwiched by top and bottom electrodes with a submicron-sized contact area, and measured magnetotransport properties at 4.2 K. Clear Coulomb staircases due to the charging effect of Co granules are observed by the addition of an Al-O bottleneck layer which leads to an asymmetric configuration of tunnel resistances. Furthermore, tunnel magnetoresistance (TMR) shows oscillatory behavior associated with the Coulomb staircase. It is considered that the TMR oscillation is based on the interplay of spin-dependent tunneling and single electron tunneling.

Original language	English
Pages (from-to)	7038-7040
Number of pages	3
Journal	Journal of Applied Physics
Volume	91
Issue number	10 I
DOIs	https://doi.org/10.1063/1.1447189
Publication status	Published - 2002 May 15

ASJC Scopus subject areas

Physics and Astronomy(all)

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abstract = "We have fabricated current-perpendicular-to-plane geometry samples consisting of a thin CoAlO granular film sandwiched by top and bottom electrodes with a submicron-sized contact area, and measured magnetotransport properties at 4.2 K. Clear Coulomb staircases due to the charging effect of Co granules are observed by the addition of an Al-O bottleneck layer which leads to an asymmetric configuration of tunnel resistances. Furthermore, tunnel magnetoresistance (TMR) shows oscillatory behavior associated with the Coulomb staircase. It is considered that the TMR oscillation is based on the interplay of spin-dependent tunneling and single electron tunneling.",

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AU - Yakushiji, K.

AU - Mitani, S.

AU - Takanashi, K.

AU - Fujimori, H.

PY - 2002/5/15

Y1 - 2002/5/15

N2 - We have fabricated current-perpendicular-to-plane geometry samples consisting of a thin CoAlO granular film sandwiched by top and bottom electrodes with a submicron-sized contact area, and measured magnetotransport properties at 4.2 K. Clear Coulomb staircases due to the charging effect of Co granules are observed by the addition of an Al-O bottleneck layer which leads to an asymmetric configuration of tunnel resistances. Furthermore, tunnel magnetoresistance (TMR) shows oscillatory behavior associated with the Coulomb staircase. It is considered that the TMR oscillation is based on the interplay of spin-dependent tunneling and single electron tunneling.

AB - We have fabricated current-perpendicular-to-plane geometry samples consisting of a thin CoAlO granular film sandwiched by top and bottom electrodes with a submicron-sized contact area, and measured magnetotransport properties at 4.2 K. Clear Coulomb staircases due to the charging effect of Co granules are observed by the addition of an Al-O bottleneck layer which leads to an asymmetric configuration of tunnel resistances. Furthermore, tunnel magnetoresistance (TMR) shows oscillatory behavior associated with the Coulomb staircase. It is considered that the TMR oscillation is based on the interplay of spin-dependent tunneling and single electron tunneling.

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Tunnel magnetoresistance oscillations in current perpendicular to plane geometry of CoAlO granular thin films

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