Tunnelling magnetoresistance of double perovskite Sr2FeMoO 6 enhanced by grain boundary adjustment

W. Zhong; W. Liu; C. T. Au; Y. W. Du

doi:10.1088/0957-4484/17/1/042

Tunnelling magnetoresistance of double perovskite Sr₂FeMoO ₆ enhanced by grain boundary adjustment

W. Zhong, W. Liu, C. T. Au^*, Y. W. Du

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

38 Citations (Scopus)

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Abstract

Polycrystalline double perovskite Sr₂FeMoO₆ samples were synthesized by a wet chemistry method under controlled reduction conditions. Single-phase 'bulrush-like' samples of grain size about 110 nm in width and >2 νm in length were readily obtained at temperatures as low as 950 °C, and they showed a large room-temperature tunnelling magnetoresistance (Δρ/ρ₀) of -21% at a low magnetic field of 10 kOe. Utilizing the reactivity of Sr₂FeMoO₆ to water and a sonochemical technique, we manipulated the properties of grain boundary (GB) barriers, and managed to enhance the room-temperature tunnelling magnetoresistance to -35%. The magnitude of the low-field magnetoresistance appears to depend strongly on GB properties, and can be regulated by controlling the reaction time with water.

Original language	English
Pages (from-to)	250-256
Number of pages	7
Journal	Nanotechnology
Volume	17
Issue number	1
DOIs	https://doi.org/10.1088/0957-4484/17/1/042
Publication status	Published - 14 Jan 2006

Scopus Subject Areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

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10.1088/0957-4484/17/1/042

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title = "Tunnelling magnetoresistance of double perovskite Sr2FeMoO 6 enhanced by grain boundary adjustment",

abstract = "Polycrystalline double perovskite Sr2FeMoO6 samples were synthesized by a wet chemistry method under controlled reduction conditions. Single-phase 'bulrush-like' samples of grain size about 110 nm in width and >2 νm in length were readily obtained at temperatures as low as 950 °C, and they showed a large room-temperature tunnelling magnetoresistance (Δρ/ρ0) of -21% at a low magnetic field of 10 kOe. Utilizing the reactivity of Sr2FeMoO6 to water and a sonochemical technique, we manipulated the properties of grain boundary (GB) barriers, and managed to enhance the room-temperature tunnelling magnetoresistance to -35%. The magnitude of the low-field magnetoresistance appears to depend strongly on GB properties, and can be regulated by controlling the reaction time with water.",

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T1 - Tunnelling magnetoresistance of double perovskite Sr2FeMoO 6 enhanced by grain boundary adjustment

AU - Zhong, W.

AU - Liu, W.

AU - Au, C. T.

AU - Du, Y. W.

PY - 2006/1/14

Y1 - 2006/1/14

N2 - Polycrystalline double perovskite Sr2FeMoO6 samples were synthesized by a wet chemistry method under controlled reduction conditions. Single-phase 'bulrush-like' samples of grain size about 110 nm in width and >2 νm in length were readily obtained at temperatures as low as 950 °C, and they showed a large room-temperature tunnelling magnetoresistance (Δρ/ρ0) of -21% at a low magnetic field of 10 kOe. Utilizing the reactivity of Sr2FeMoO6 to water and a sonochemical technique, we manipulated the properties of grain boundary (GB) barriers, and managed to enhance the room-temperature tunnelling magnetoresistance to -35%. The magnitude of the low-field magnetoresistance appears to depend strongly on GB properties, and can be regulated by controlling the reaction time with water.

AB - Polycrystalline double perovskite Sr2FeMoO6 samples were synthesized by a wet chemistry method under controlled reduction conditions. Single-phase 'bulrush-like' samples of grain size about 110 nm in width and >2 νm in length were readily obtained at temperatures as low as 950 °C, and they showed a large room-temperature tunnelling magnetoresistance (Δρ/ρ0) of -21% at a low magnetic field of 10 kOe. Utilizing the reactivity of Sr2FeMoO6 to water and a sonochemical technique, we manipulated the properties of grain boundary (GB) barriers, and managed to enhance the room-temperature tunnelling magnetoresistance to -35%. The magnitude of the low-field magnetoresistance appears to depend strongly on GB properties, and can be regulated by controlling the reaction time with water.

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Tunnelling magnetoresistance of double perovskite Sr₂FeMoO ₆ enhanced by grain boundary adjustment

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