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

W. Zhong, W. Liu, Chak Tong AU*, Y. W. Du

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

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 languageEnglish
Pages (from-to)250-256
Number of pages7
JournalNanotechnology
Volume17
Issue number1
DOIs
Publication statusPublished - 14 Jan 2006

Scopus Subject Areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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