Magnetic Characterization of Electrodeposited Pt1−xNix Alloy Films: Influence of Deposition Potential and the Presence of Boric Acid. Issue 9 (1st September 2022)

• Record Type: Journal Article
• Authors: Rus, Eric D.; L. Corrêa, Eduardo; Groopman, Evan; Williamson, Todd; Hijazi, Hussein; Kasaei, Leila; Dennis, Cindi L.; Moffat, Thomas P.
• Is Part Of: Journal of the Electrochemical Society. Volume 169:Issue 9(2022)
• Publication Date: 2022-09-01
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac8ad1
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Pt1-x Nix (x = 0.25 to 0.92) thin films were examined for possible application as magnetic thermometers. The alloys were prepared by potentiostatic electrodeposition from aqueous chloride-based solutions in the presence and absence of 0.5 mol dm −3 B(OH)3 . Alloy composition was controlled by the deposition potential with the Ni concentration increasing towards more reducing potentials. Films with x > 0.45 were ferromagnetic with the magnetization at 300 K increasing with nickel content. Magnetization vs temperature (M vs T) at 8 kA m −1 (100 Oe) showed an increase in the Curie temperature from less than 200 K to above 400 K for the alloys investigated. For films deposited at potentials >−0.6 V vs the saturated calomel electrode (SCE), boric acid had negligible effect on the magnetization at the maximum applied field in M vs H measurements. In contrast, for depositions at more reducing potentials <−0.6 V vs SCE the presence of boric acid resulted in diminished magnetization. This effect was attributed to elevated incorporation of oxygen (up to ∼4 atomic %), along with boron incorporation of about 400 μmol mol −1 .