The effect of CoPt 3 sublayer on the formation of fct-L1 0 FePt nanoparticles in direct synthesis method

• Published in: Physica scripta 2024-08, Vol.99 (8), p.85928
• Main Authors: Javani, F, Sebt, S A, Khajehnezhad, A, Aezami, A
• Format: Article
• Language: English
• ISSN: 0031-8949; 1402-4896
• DOI: 10.1088/1402-4896/ad547c

The smaller the size of magnetic nanoparticles is, the less their coercivity will be. The magnetic coercivity of FePt nanoparticles, in the compound ordered phase, known as fct-L1 0 FePt, is up to the order of tesla; however, the temperature of 600 °C, required for the formation of this phase, increases the size of FePt nanoparticles. In this research, fct-L1 0 FePt nanoparticles were fabricated using the direct synthesis method by Co-sputtering system. The presence of a CoPt 3 sublayer resulted in the formation of a fct-L1 0 phase of FePt nanoparticles at 400 °C with a uniform surface distribution and mean size and standard deviation of 11 nm and 1.5 nm, respectively. The same as the other results of FePt/CoPt 3 , magnetic coercivity of fct-L1 0 FePt nanoparticles, with the mentioned size, reached to 3.0 kOe at room temperature, because of the presence of the CoPt 3 sublayer.