Strain and crystallite size controlled ordering of Heusler nanoparticles having high heating rate for magneto-thermal application

Abstract

Heusler compound nanoparticles with good structural ordering need to be investigated as a potential material class for magneto-thermal applications requiring heat generation in presence of an oscillating magnetic field. Here, we report an important finding of a structural parameter related to the product of the strain and the coherent crystallite size, that can be used to efficiently control the structural ordering and the magnetic property of the Heulser compound nanoparticles. The optimization of this product parameter is found to enhance both the structural ordering and magnetic transition temperature in Co2FeSn Heusler nanoparticles. Furthermore, using magnetic hyperthermia measurements we demonstrate the possibility of heat generation using Heusler compound nanoparticles comparable to that of conventional magnetic nanoparticles. This shall lead to the development of Heulser compounds for similar applications.

Single-Domain Fe2CoAl Nanoparticles and Their Crystallite Size-Dependent Properties

“…Theoretical prediction , and successful experimental preparation of Heusler alloys in nanocrystalline forms have extended the application of these prototype ternary ferromagnetic alloys to nanometric devices. Researchers have already demonstrated the application of these nanoparticles in hyperthermia treatment of cancer cells, SARS Cov-2 detection, catalysis, biosensing, spintronics, etc. The advantages of Heusler alloy nanoparticles are mostly due to their novel properties such as high saturation magnetization ( M s ), high effective anisotropy constant ( K eff ), high Curie temperature ( T c ), tunability of magnetic properties, soft magnetic behavior, etc.…”

Size-dependent properties of single domain Fe2CoGa nanoparticles prepared by a facile template-less chemical route

“…For example, Wang et al showed the applicability of HA nanoparticles in spintronics, 9 and Kappe et al utilized these HA nanoparticles in biosensing. 10 HA nanoparticles have also been employed in catalysis, 11 SARS CoV-2 detection, 12 hyperthermia treatment of cancer, 13 etc. Apart from the mechanical alloying route, HA nanoparticles have also been synthesized by co-precipitation, 14 and chemical 15 routes.…”

Single-domain Fe2CoGa0.5Al0.5 Heusler alloy nanoparticles with enhanced properties

“…Hence, HA nanoparticles are increasingly finding applications in diverse fields such as SARS-CoV-2 detection, 3 biosensing, 4 catalyses, 5 and hyperthermia treatment of cancer. 6 Though ternary Fe 2 CoGa and Fe 2 CoAl compounds are well-studied alloys ranging from bulk (3-d) to other low (2-, 1- and 0-) dimensional forms, the intermediate quaternary composition of Fe 2 CoGa 0.5 Al 0.5 has not been explored till now either in bulk or lower dimensional forms. The interest in quaternary HA such as Fe 2 CoGa 0.5 Al 0.5 stems from the fact that these intermediate compositions carry the benefits of the two end ternary compositions and hence have better potential for applications.…”