Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Low Platinum Content Exchange-Coupled CoPt Nanoalloys with Enhanced Magnetic Properties

Georgia Basina
* ,
Vasileios Alexandrakis
,
Ioannis Panagiotopoulos
ORCID logo ,
Dimitrios Niarchos
,
Eamonn Devlin
,
Margarit Gjoka
ORCID logo ,
George C. Hadjipanayis
,
Vasileios Tzitzios
* ORCID logo
Version 1 : Received: 23 October 2023 / Approved: 24 October 2023 / Online: 25 October 2023 (11:19:05 CEST)

A peer-reviewed article of this Preprint also exists.

Basina, G.; Alexandrakis, V.; Panagiotopoulos, I.; Niarchos, D.; Devlin, E.; Gjoka, M.; Hadjipanayis, G.C.; Tzitzios, V. Low-Platinum-Content Exchange-Coupled CoPt Nanoalloys with Enhanced Magnetic Properties. Nanomaterials 2024, 14, 482, doi:10.3390/nano14060482. Basina, G.; Alexandrakis, V.; Panagiotopoulos, I.; Niarchos, D.; Devlin, E.; Gjoka, M.; Hadjipanayis, G.C.; Tzitzios, V. Low-Platinum-Content Exchange-Coupled CoPt Nanoalloys with Enhanced Magnetic Properties. Nanomaterials 2024, 14, 482, doi:10.3390/nano14060482.

Abstract

Bimetallic colloidal CoPt nanoalloys, with a very low platinum content, were successfully synthesized following a modified polyol approach. Powder X-ray diffraction, IR spectroscopy, thermogravimetric analysis, and Transmission Electron Microscopy studies were performed to estimate the crystal structure, morphology and surface functionalization of the colloids respectively, while the room temperature magnetic properties were measured using Vibrating Sample Magnetometer. The particles exhibit excellent uniformity, with a narrow size distribution, and display strong room temperature hysteretic ferromagnetic behavior even in the as-made form. Upon annealing at elevated temperatures, progressive formation and co-existence of exchange coupled both chemically ordered and disordered phases, significantly enhance the room temperature coercivity.

Keywords

cobalt-platinum alloy; L10 phase; CoPt; Co3Pt; exchange coupling; bimetallic nanoparticles; polyol method

Subject

Chemistry and Materials Science, Nanotechnology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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