Magnetostructural phase transition in electroless-plated Ni nanoarrays

Chun Chao Huang, Chih Chieh Lo, Yuan-Chieh Tseng*, Chien Min Liu, Chih Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Ni nanoarrays were synthesized by electroless-plating and shaped by an anodic aluminum oxide template. The as-plated arrays exhibited superparamagnetic (SM) ordering resulting from nanocrystalline microstructure. Ferromagnetic (FM) ordering was found to be restored as the arrays' crystallinity was enhanced upon post-annealing. The microstructure (crystallinity) and the FM ordering are strongly coupled, revealing a magneto-structural correlation for the arrays. The magnetostructural properties of the arrays can be controlled by post-annealing, where the magnetization is proportional to the annealing temperature. The electroless-plated arrays synthesized in this work display magnetic anisotropy not found in electroplated ones. This is likely attributed to the nature of the clusterlike microstructure, whose cluster-boundaries may confine the FM rotation within the cluster. The spin-polarization was probed by x-ray magnetic circular dichroism while the arrays underwent the SM→FM phase transition. The sum-rules results reveal that the total magnetization of the arrays is dominated by spin moment (mspin). The change in mspin is responsible for the SM→FM phase transition upon annealing, as well as for the loss of magnetization upon temperature increase that we observed macroscopically.

Original languageEnglish
Article number113905
JournalJournal of Applied Physics
Volume109
Issue number11
DOIs
StatePublished - 1 Jun 2011

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