Redox-Induced Modification of Magnetism in Ni Thin Film

Abstract

Magnetic properties of Ni thin films which were modified through the redox reaction in alkaline solution were investigated by means of magneto-optical Faraday effect. The magnetization process of Ni film on which Ni(II) compounds electrochemically forms was different from that of fresh Ni films. This indicates that the magnetic anisotropy is modified through the redox reaction Ni(0)/Ni(II) which may induce the change in the volume of metallic nickel region and/or the magnetic coupling between the metallic Ni and some compound including Ni(II) formed on the film surface.

SQUID magnetometry combined with in situ cyclic voltammetry: A case study of tunable magnetism of γ-Fe2O3 nanoparticles

“…In the case of electrodeposition such in situ measurements were performed with the help of magneto-optical Kerr effect [2,11,12] and alternating gradient field magnetometry [2,13]. In situ studies of the charging-induced modification of magnetic properties of materials were performed by magneto-optical Kerr [9] or Faraday effect [10] as well as by magnetometry using extraction magnetometers [3–7] or a SQUID magnetometer [8]. Most of these measurements were performed with electrochemical cells containing only two electrodes [3–6,8,9].…”

“…However, such two-electrode set-ups do not allow to record reliable cyclic voltammograms which are necessary for studying the underlying electrochemical processes. Attempts to apply three-electrode electrochemical cells were scarcely performed so far (extraction magnetometry: [7]; Faraday effect: [10]) and, to the best of our knowledge, in situ cyclic voltammetry has not yet been combined with SQUID magnetometry.…”