Coupled microstructural and magnetic transition in Co-doped Ni nano-arrays

Chao Yao Yang, Chun Chao Huang, Yuan-Chieh Tseng*, Chien Min Liu, Chih Chen, Hong Ji Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A superparamagnetic (SM) to ferromagnetic (FM) phase transition was investigated in Co-doped (∼6) electroless plated Ni arrays. The introduction of Co altered the microstructure of the Ni arrays from nanocrystalline to polycrystalline, resulting in a SM→FM transition. This Co-induced magnetic phase transition is similar to that observed after heat treatment of undoped samples [C. M. Liu, Y. C. Tseng, C. Chen, M. C. Hsu, T. Y. Chao, and Y. T. Cheng, Nanotechnology 20, 415703 (2009); C. C. Huang, C. C. Lo, Y. C. Tseng, C. M. Liu, and C. Chen, J. Appl. Phys. 109, 113905 (2011)]. The role of Co dopant was identified electronically using x-ray magnetic spectroscopy, revealing that the transition modified the Ni host's electronic structure and enhanced its moment by effectively spin-polarizing the Ni 3d conduction band. This was distinctly different than in the heat treatment case, which underwent an electronically independent phase transition. The element-specific magnetic hysteresis of Co and Ni was also probed, which showed that the two elements were magnetically coupled.

Original languageEnglish
Article number073913
JournalJournal of Applied Physics
Volume110
Issue number7
DOIs
StatePublished - 1 Oct 2011

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