First-principles calculations and experimental studies on Co2FeGe Heusler alloy nanoparticles for spintronics applications

Here, we report the synthesis and physical properties of Co2FeGe (CFG) Heusler alloy (HA) nanoparticles (NPs). The NPs of size 23 +/- 10 nm are prepared using the co-precipitation method. X-ray and selected area electron diffraction patterns have confirmed the cubic Heusler phase of the NPs with the A2-disorder. These NPs are soft ferromagnetic, and exhibit a high saturation magnetization (Ms) along with a very high Curie temperature (Tc) of 1060 K. The observed Tc value matches closely with the theoretically calculated one following a model provided by Wurmehl et al. (2005). The high Ms and Tc make the present system a potential candidate for magnetically activated nano-devices working at high temperatures. The near-integral value 5.9 mu B/f.u. of Ms at low temperatures indicates that the half-metallic ferromagnetism is preserved even in the particles even on the 20 nm length scale. Additionally, we have facilitated the existing HA-NP preparation method, which can be used in synthesizing other HA-NPs. The first-principles density functional theory computations complement the experimental results. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study reports the synthesis and physical properties of Co2FeGe Heusler alloy nanoparticles, which show high magnetic performance and stability at high temperatures. The nanoparticles could potentially be candidates for magnetic nano-devices working at elevated temperatures.