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

TL;DR

This study combines synthesis, experimental characterization, and first-principles calculations to explore Co2FeGe Heusler alloy nanoparticles, revealing their high Curie temperature, significant saturation magnetization, and potential for high-temperature spintronics applications.

Contribution

It introduces a synthesis method for Co2FeGe nanoparticles and demonstrates their magnetic properties and theoretical validation, advancing spintronics material research.

Findings

Nanoparticles are 23 nm in size with cubic Heusler phase.

High Curie temperature of 1060 K observed.

Preservation of half-metallic ferromagnetism at nanoscale.

Abstract

Here, we report the synthesis and physical properties of Co2FeGe (CFG) Heusler alloy (HA) nanoparticles (NPs). The NPs of size 23 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. [1]. 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 mehoB/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.