Coulomb staircase and tunnel magnetoresistance in nanowire-shaped granular films

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

doi:10.1016/j.jmmm.2006.01.098

Coulomb staircase and tunnel magnetoresistance in nanowire-shaped granular films

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

Collaborative Research Center on Energy Materials

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

3 Citations (Scopus)

Abstract

Spin-dependent single-electron tunneling properties have been studied in nanostructured samples consisting of nonmagnetic electrodes with a nanogap and (Co-Pt)-Al-O granular films. The granular films were formed into a nanowire shape by electron-beam lithography and Ar ion milling in order to restrict current channels bridging between electrodes. Clear Coulomb staircases have successfully been observed due to the sufficient restriction of current channels in a granular nanowire. Tunnel magnetoresistance as a function of bias voltage shows oscillatory behavior with sign change, suggesting spin-dependent single-electron tunneling with spin accumulation in Co-Pt nanoparticles.

Original language	English
Pages (from-to)	e355-e358
Journal	Journal of Magnetism and Magnetic Materials
Volume	303
Issue number	2 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jmmm.2006.01.098
Publication status	Published - 2006 Aug

Keywords

Coulomb blockade
Insulating granular system
Nanogap
Single-electron tunneling
Spin-dependent tunneling
Tunnel magnetoresistance

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "Spin-dependent single-electron tunneling properties have been studied in nanostructured samples consisting of nonmagnetic electrodes with a nanogap and (Co-Pt)-Al-O granular films. The granular films were formed into a nanowire shape by electron-beam lithography and Ar ion milling in order to restrict current channels bridging between electrodes. Clear Coulomb staircases have successfully been observed due to the sufficient restriction of current channels in a granular nanowire. Tunnel magnetoresistance as a function of bias voltage shows oscillatory behavior with sign change, suggesting spin-dependent single-electron tunneling with spin accumulation in Co-Pt nanoparticles.",

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author = "K. Yakushiji and M. Matsuura and S. Mitani and K. Takanashi and H. Fujimori",

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T1 - Coulomb staircase and tunnel magnetoresistance in nanowire-shaped granular films

AU - Yakushiji, K.

AU - Matsuura, M.

AU - Mitani, S.

AU - Takanashi, K.

AU - Fujimori, H.

PY - 2006/8

Y1 - 2006/8

N2 - Spin-dependent single-electron tunneling properties have been studied in nanostructured samples consisting of nonmagnetic electrodes with a nanogap and (Co-Pt)-Al-O granular films. The granular films were formed into a nanowire shape by electron-beam lithography and Ar ion milling in order to restrict current channels bridging between electrodes. Clear Coulomb staircases have successfully been observed due to the sufficient restriction of current channels in a granular nanowire. Tunnel magnetoresistance as a function of bias voltage shows oscillatory behavior with sign change, suggesting spin-dependent single-electron tunneling with spin accumulation in Co-Pt nanoparticles.

AB - Spin-dependent single-electron tunneling properties have been studied in nanostructured samples consisting of nonmagnetic electrodes with a nanogap and (Co-Pt)-Al-O granular films. The granular films were formed into a nanowire shape by electron-beam lithography and Ar ion milling in order to restrict current channels bridging between electrodes. Clear Coulomb staircases have successfully been observed due to the sufficient restriction of current channels in a granular nanowire. Tunnel magnetoresistance as a function of bias voltage shows oscillatory behavior with sign change, suggesting spin-dependent single-electron tunneling with spin accumulation in Co-Pt nanoparticles.

KW - Coulomb blockade

KW - Insulating granular system

KW - Nanogap

KW - Single-electron tunneling

KW - Spin-dependent tunneling

KW - Tunnel magnetoresistance

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Coulomb staircase and tunnel magnetoresistance in nanowire-shaped granular films

Abstract

Keywords

ASJC Scopus subject areas

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