Effect of pressure on the tunnel magnetoresistance of Co-Al-O granular films

S. Kaji; G. Oomi; S. Mitani; K. Takanashi

doi:10.1016/j.jmmm.2003.12.821

Effect of pressure on the tunnel magnetoresistance of Co-Al-O granular films

S. Kaji, G. Oomi, S. Mitani, K. Takanashi

Collaborative Research Center on Energy Materials

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

1 Citation (Scopus)

Abstract

We have measured electrical resistivity and magnetoresistance of Co ₅₂Al₂₀O₂₈ insulating granular film under high pressure. It is found that the temperature dependence of electrical resistivity ρ(T) is affected strongly by applying pressure. The results suggest a metallic conductivity at high pressure. Furthermore the tunnel magnetoresistance (TMR) is enhanced by more than 2% at 3.1 GPa and 4.2 K, while no enhancement is observed at 77 K and r.t.

Original language	English
Pages (from-to)	1829-1830
Number of pages	2
Journal	Journal of Magnetism and Magnetic Materials
Volume	272-276
Issue number	III
DOIs	https://doi.org/10.1016/j.jmmm.2003.12.821
Publication status	Published - 2004 May

Keywords

Granular material
Pressure effect
Tunnel magnetoresistance

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We have measured electrical resistivity and magnetoresistance of Co 52Al20O28 insulating granular film under high pressure. It is found that the temperature dependence of electrical resistivity ρ(T) is affected strongly by applying pressure. The results suggest a metallic conductivity at high pressure. Furthermore the tunnel magnetoresistance (TMR) is enhanced by more than 2% at 3.1 GPa and 4.2 K, while no enhancement is observed at 77 K and r.t.",

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T1 - Effect of pressure on the tunnel magnetoresistance of Co-Al-O granular films

AU - Kaji, S.

AU - Oomi, G.

AU - Mitani, S.

AU - Takanashi, K.

PY - 2004/5

Y1 - 2004/5

N2 - We have measured electrical resistivity and magnetoresistance of Co 52Al20O28 insulating granular film under high pressure. It is found that the temperature dependence of electrical resistivity ρ(T) is affected strongly by applying pressure. The results suggest a metallic conductivity at high pressure. Furthermore the tunnel magnetoresistance (TMR) is enhanced by more than 2% at 3.1 GPa and 4.2 K, while no enhancement is observed at 77 K and r.t.

AB - We have measured electrical resistivity and magnetoresistance of Co 52Al20O28 insulating granular film under high pressure. It is found that the temperature dependence of electrical resistivity ρ(T) is affected strongly by applying pressure. The results suggest a metallic conductivity at high pressure. Furthermore the tunnel magnetoresistance (TMR) is enhanced by more than 2% at 3.1 GPa and 4.2 K, while no enhancement is observed at 77 K and r.t.

KW - Granular material

KW - Pressure effect

KW - Tunnel magnetoresistance

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JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

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