tailieunhanh - CTAB-assisted synthesis and characterization of FePd nanoparticles

In this study, Fe50Pd50 nanoparticles with small size of around 5-9 nm were prepared by sonoelectrodeposition in the presence of cetyltrimethylammonium bromide (CTAB) surfactant. The as-prepared nanoparticles were annealed at 550oC for a series of times from 1 h to 6 h. | VNU Journal of Science Mathematics Physics Vol. 37 No. 3 2021 1-8 Original Article CTAB-assisted Synthesis and Characterization of FePd Nanoparticles Nguyen Hoang Nam1 2 Nguyen Thi Bich Ngoc1 Truong Thanh Trung1 Tran Thi Hong1 Phi Thi Huong1 Nguyen Hoang Luong1 2 1 VNU University of Science 334 Nguyen Trai Thanh Xuan Hanoi Vietnam 2 VNU Vietnam - Japan University Luu Huu Phuoc Nam Tu Liem Hanoi Vietnam Received 12 August 2021 Revised 22 August 2021 Accepted 30 August 2021 Abstract In this study Fe50Pd50 nanoparticles with small size of around 5-9 nm were prepared by sonoelectrodeposition in the presence of cetyltrimethylammonium bromide CTAB surfactant. The as-prepared nanoparticles were annealed at 550oC for a series of times from 1 h to 6 h. After annealing a transformation from a disordered face-centered-cubic structure to the ordered L10 structure occurred. It was revealed that the coercivity of the nanoparticles was larger compared to that of the samples prepared by the same method in the absence of CTAB. The structural and magnetic properties of the samples were studied in dependence of annealing time. The results indicate a similar behavior of the evolution of tetragonality ratio and coercivity with annealing time in the nanoparticles. Keywords FePd sonoelectrodeposition coercivity magnetic nanoparticles. 1. Introduction FePt FePd and CoPt nanoparticles with large magnetocrystalline anisotropy of the L10 ordered structure have attracted much interest because of their potential applications in ultrahigh-density magnetic storage 1 2 . As for FePt and CoPt nanoparticles the as-prepared FePd nanoparticles have a disordered face-centered cubic fcc structure and a thermal annealing is necessary to transform them into the desired ordered face-centered tetragonal fct L1o phase. _ Corresponding author. Email address luongnh@ https 2588-1124 1 2 N. H. Nam et al. VNU Journal of Science Mathematics Physics Vol. 37 No. 3 2021 1-8 .