Evolution of superparamagnetism in the electrochemical dealloying process

Markus Gößler*, Manfred Nachtnebel, Hartmuth Schröttner, Heinz Krenn, Eva-Maria Steyskal, Roland Würschum

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In situ superconducting quantum interference device magnetometry provides insights into the electrochemical dealloying mechanism of a CoPd alloy. Charge-dependent measurements of magnetic moment allow the separation of primary and secondary dealloying contributions. Coercivity evolution revealed the transition from collective ferromagnetism to superparamagnetism of small alloy clusters evolving in the dealloying process, which is interpreted as an “inverse” magnetic percolation problem. Temperature-dependent magnetization curves enable a qualitative comparison of magnetic cluster size distributions in the nanoporous Pd framework, which are found to be strongly influenced by dealloying potential. The study underlines the potential of electrochemical dealloying as a promising method for the preparation of tailor-made magnetic nanostructures.
Original languageEnglish
Article number093904
Number of pages10
JournalJournal of Applied Physics
Volume128
Issue number9
DOIs
Publication statusPublished - 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fields of Expertise

  • Advanced Materials Science

Cite this