Magnetic properties of electroless-deposited Ni and NiNiO coreshell nano-arrays

Chih Chieh Lo, Chun Chao Huang, Chien Min Liu, Chih Chen, Chang Yang Kuo, Hong Ji Lin, Yuan Chieh Tseng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Ni and NiNiO coreshell nano-arrays were fabricated by means of electroless deposition, where the latter was covered by a NiO shell of ∼10 nm by annealing the former at 350 °C for 30 min in an atmospheric condition. HRTEM showed that the NiO shell was developed at the expense of Ni at the arrays surface. Ferromagnetic ordering of the NiNiO arrays was found to be suppressed compared with those of the less oxidized reference Ni arrays. This is attributed to the screening effect of the NiO shell, and weak ferromagnetism of inner Ni arrays resulted from the development of the NiO. X-ray absorption spectrum reveals that the reference Ni is partially oxidized. Also, X-ray magnetic circular dichroism suggests that the magnetic suppression of the NiNiO arrays is associated with a reduced spin moment.

Original languageEnglish
Pages (from-to)1950-1953
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume323
Issue number15
DOIs
StatePublished - 1 Aug 2011

Keywords

  • Anodic aluminum oxide
  • Core-shell
  • Electroless deposition
  • Nano-array
  • X-ray magnetic circular dichroism

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