TY - JOUR
T1 - Lightweight macroporous Co-Pt electrodeposited films with semi-hard-magnetic properties
AU - Navarro-Senent, Cristina
AU - Eiler, Konrad
AU - Pané, Salvador
AU - Sort, Jordi
AU - Pellicer, Eva
N1 - Publisher Copyright:
© 2021 The Author(s)
PY - 2022/1/1
Y1 - 2022/1/1
N2 - Macroporous, partially L1(0)-ordered Co-Pt films with nearly equiatomic composition were successfully synthesized by electrodeposition from an aqueous sulfate-chloride electrolyte on colloidal crystal-templated substrates, followed by annealing in vacuum. The colloids deposited on the substrate consisted of amidine-functionalized polystyrene spheres of 215 +/- 13 nm in diameter, which were self-assembled by electrophoresis. As-deposited Co-Pt films obtained after the removal of the spheres showed a highly-packed arrangement of macropores. Structurally, the films showed the A1-disordered face-centered cubic (fcc) Co-Pt solid solution, accompanied by small amounts of fcc/hexagonal close-packed (hcp)-Co. Upon annealing at 600 degrees C, the A1-disordered phase partly transformed into the L1(0)-ordered (face-centered tetragonal, fct) phase. As a result, the coercivity significantly increased from 148 Oe to 1328 Oe. Importantly, the porosity of the films was preserved after annealing. Optimum annealing temperature and time were selected on the basis of a prior parametric study with electroplated dense counterparts. This work demonstrates that the combination of colloidal crystal templating and electrodeposition is a very convenient pathway towards lightweight semi-hard magnets with potential technological applications in automotive and aerospace industries, portable sensors or spectrometers, magnetic levitation systems, or magnetoelectric devices, among others. (C) 2021 The Author(s). Published by Elsevier Ltd.
AB - Macroporous, partially L1(0)-ordered Co-Pt films with nearly equiatomic composition were successfully synthesized by electrodeposition from an aqueous sulfate-chloride electrolyte on colloidal crystal-templated substrates, followed by annealing in vacuum. The colloids deposited on the substrate consisted of amidine-functionalized polystyrene spheres of 215 +/- 13 nm in diameter, which were self-assembled by electrophoresis. As-deposited Co-Pt films obtained after the removal of the spheres showed a highly-packed arrangement of macropores. Structurally, the films showed the A1-disordered face-centered cubic (fcc) Co-Pt solid solution, accompanied by small amounts of fcc/hexagonal close-packed (hcp)-Co. Upon annealing at 600 degrees C, the A1-disordered phase partly transformed into the L1(0)-ordered (face-centered tetragonal, fct) phase. As a result, the coercivity significantly increased from 148 Oe to 1328 Oe. Importantly, the porosity of the films was preserved after annealing. Optimum annealing temperature and time were selected on the basis of a prior parametric study with electroplated dense counterparts. This work demonstrates that the combination of colloidal crystal templating and electrodeposition is a very convenient pathway towards lightweight semi-hard magnets with potential technological applications in automotive and aerospace industries, portable sensors or spectrometers, magnetic levitation systems, or magnetoelectric devices, among others. (C) 2021 The Author(s). Published by Elsevier Ltd.
KW - Co-Pt alloys
KW - Electrodeposition
KW - Magnetic properties
KW - Porous films
UR - http://www.scopus.com/inward/record.url?scp=85122161534&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/3b209e27-eb36-3a6d-bd35-178298fc297b/
U2 - 10.1016/j.matdes.2021.110369
DO - 10.1016/j.matdes.2021.110369
M3 - Article
AN - SCOPUS:85122161534
SN - 0141-5530
VL - 213
JO - International Journal of Materials in Engineering Applications
JF - International Journal of Materials in Engineering Applications
M1 - 110369
ER -