Enhanced exchange bias and coercivity arising from heterojunctions in Ni-NiO nanocomposites

Xiu Juan Yao, Xue Min He, Xue Yin Song, Qian Ding, Zhi Wen Li, Wei Zhong*, Chak Tong AU, You Wei Du

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

By a reflux process, we prepared Ni-NiO nanocomposites that are face-centered cubic (fcc). By tuning the precursor concentration, we controlled the Ni content in the Ni-NiO nanocomposites. We found that both the interface of Ni and NiO crystal lattices and the weight fraction of Ni have significant impacts on their magnetic properties. There is increase of saturation magnetization and decrease of coercivity (HC) with the increase of the Ni weight fraction. Large exchange bias (HE) and enhanced H C are observed at 5 K, which are due to the creation of heterojunctions at the interfaces of ferromagnetic Ni and antiferromagnetic NiO. After optimization, it is observed that the Ni-NiO nanocomposites with an Ni content of 2.6% show an HC and HE of 1068 and 350 Oe, respectively.

Original languageEnglish
Pages (from-to)6925-6930
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number15
DOIs
Publication statusPublished - 21 Apr 2014

Scopus Subject Areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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