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Magnetic Characterization of Electrodeposited Pt1-xNix Alloy Films: Influence of Deposition Potential and the Presence of Boric Acid

Published

Author(s)

Eric Rus, Eduardo De Lima Correa, Evan Groopman, Todd Williamson, Hussein Hijazi, Leila Kasaei, Leonard Feldman, Cindi L. Dennis, Thomas P. Moffat

Abstract

Pt1-xNix (x = 0.25 to 0.92) thin films were examined for possible application as temperature sensing magnetic reporters. The alloys were prepared by charge-limited potentiostatic electrodeposition from aqueous chloride-based solutions in the presence and absence of 0.5 mol/dm3 B(OH)3. Alloy composition was controlled by the deposition potential with the Ni concentration increasing toward 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 (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 SCE, boric acid had negligible effect on the magnetizations 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 was attributed elevated incorporation of oxygen up to 4 at%, along with boron incorporation of about 400 ppm.
Citation
Journal of the Electrochemical Society
Volume
169

Keywords

platinum, nickel, Pt1-xNix, alloy electrodeposition, Rutherford backscattering spectroscopy, SIMS, XPS, EDS, SQUID-VSM, magnetic thermosensitivity, oxygen

Citation

Rus, E. , De Lima Correa, E. , Groopman, E. , Williamson, T. , Hijazi, H. , Kasaei, L. , Feldman, L. , Dennis, C. and Moffat, T. (2022), Magnetic Characterization of Electrodeposited Pt1-xNix Alloy Films: Influence of Deposition Potential and the Presence of Boric Acid, Journal of the Electrochemical Society, [online], https://doi.org/10.1149/1945-7111/ac8ad1, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934812 (Accessed April 15, 2024)
Created September 21, 2022, Updated March 7, 2023