Preparation of Co-Fe-Ni alloy micropillar by microanode-guided electroplating

Yao Tien Tseng, Guan Xun Wu, Jing Chie Lin, Yean Ren Hwang, Da Hua Wei, Shou Yi Chang, Kun Cheng Peng

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Microanode-guided electroplating (MAGE) was performed to prepare cobalt-iron-nickel alloying micropillars. The electrolyte was prepared by fixing [Fe2+] at 0.040 M and varying [Co2+] in 0.040–0.100 M and [Ni2+] in 0.30–0.60 M. The effect of bath composition on the compositional, mechanical, and magnetic properties of the alloying micropillars was investigated. Resulting from FE-SEM and EDS, all the micropillars demonstrated a smooth morphology but in different compositions depending on the bath composition. Through XRD analysis, the micropillars were characterized in nanocrystals of Co-Ni and Co7Fe3. After nano-indentation testing, the reduced Young's modulus of the pillars was estimated at 103.1–185 GPa and the hardness at 5.70–6.38 GPa. Investigation of all the specimens with VSM, Co61Fe27Ni12 and Co63Fe25Ni12 displayed the notable saturation magnetization (Ms = 180 and 175 emu/g) and the lowest coercive magnetic field (Hc = 2.1 and 1.4 Oe) among them. The mechanism of anomalous Co-Fe-Ni electrodeposition is proposed.

Original languageEnglish
Article number160873
JournalJournal of Alloys and Compounds
Volume885
DOIs
StatePublished - 10 Dec 2021

Keywords

  • Cathodic potentiodynamic polarization
  • Co-Fe-Ni alloy
  • Magnetic property
  • Microanode-guided electroplating
  • Soft magnetic micropillar

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