Enhanced tunnel magnetoresistance in granular nanobridges

K. Yakushiji; S. Mitani; K. Takanashi; S. Takahashi; S. Maekawa; H. Imamura; H. Fujimori

doi:10.1063/1.1341231

Enhanced tunnel magnetoresistance in granular nanobridges

K. Yakushiji, S. Mitani, K. Takanashi, S. Takahashi, S. Maekawa, H. Imamura, H. Fujimori

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

86 Citations (Scopus)

Abstract

We have fabricated granular nanobridge structures consisting of electrodes separated by a nanometer-sized gap in which a thin insulating CoAlO granular film is filled, and measured the current-bias voltage characteristics in a magnetic field to investigate the spin-dependent transport. The Coulomb blockade with a clear threshold voltage (V_th) is observed at 4.2 K. Tunnel magnetoresistance (TMR) is enhanced by fabricating nanobridges. TMR shows a maximum exceeding about 30% at the voltage slightly above V^th. This enhancement is explained by the orthodox theory of single, electron tunneling in ferromagnetic multiple tunnel junctions.

Original language	English
Pages (from-to)	515-517
Number of pages	3
Journal	Applied Physics Letters
Volume	78
Issue number	4
DOIs	https://doi.org/10.1063/1.1341231
Publication status	Published - 2001 Jan 22

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.1341231

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abstract = "We have fabricated granular nanobridge structures consisting of electrodes separated by a nanometer-sized gap in which a thin insulating CoAlO granular film is filled, and measured the current-bias voltage characteristics in a magnetic field to investigate the spin-dependent transport. The Coulomb blockade with a clear threshold voltage (Vth) is observed at 4.2 K. Tunnel magnetoresistance (TMR) is enhanced by fabricating nanobridges. TMR shows a maximum exceeding about 30% at the voltage slightly above Vth. This enhancement is explained by the orthodox theory of single, electron tunneling in ferromagnetic multiple tunnel junctions.",

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AU - Yakushiji, K.

AU - Mitani, S.

AU - Takanashi, K.

AU - Takahashi, S.

AU - Maekawa, S.

AU - Imamura, H.

AU - Fujimori, H.

PY - 2001/1/22

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N2 - We have fabricated granular nanobridge structures consisting of electrodes separated by a nanometer-sized gap in which a thin insulating CoAlO granular film is filled, and measured the current-bias voltage characteristics in a magnetic field to investigate the spin-dependent transport. The Coulomb blockade with a clear threshold voltage (Vth) is observed at 4.2 K. Tunnel magnetoresistance (TMR) is enhanced by fabricating nanobridges. TMR shows a maximum exceeding about 30% at the voltage slightly above Vth. This enhancement is explained by the orthodox theory of single, electron tunneling in ferromagnetic multiple tunnel junctions.

AB - We have fabricated granular nanobridge structures consisting of electrodes separated by a nanometer-sized gap in which a thin insulating CoAlO granular film is filled, and measured the current-bias voltage characteristics in a magnetic field to investigate the spin-dependent transport. The Coulomb blockade with a clear threshold voltage (Vth) is observed at 4.2 K. Tunnel magnetoresistance (TMR) is enhanced by fabricating nanobridges. TMR shows a maximum exceeding about 30% at the voltage slightly above Vth. This enhancement is explained by the orthodox theory of single, electron tunneling in ferromagnetic multiple tunnel junctions.

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Enhanced tunnel magnetoresistance in granular nanobridges

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