Magnetization enhancement in Fe-Co-B alloy nanoparticles

B. MOLINA CONCHA; R. D. ZYSLER; H. ROMERO

Reñaca, Chile

Congreso; VII Latin American Workshop on Magnetism, Magnetic Materials and Their Applications (7LAW3M); 2005

Co–Fe alloy may have magnetic moment higher than that of pure metallic Fe or Co. Particularly, bulk FexCo1-x shows a broad maximum in the magnetic moment as a function of composition centred in x = 0.65 at 0K (theoretical calculation) and at x = 0.6 for room temperature. We have synthesised 3-nm (FexCo1-x)0.6B0.4 (0<x<1) amorphous nanoparticles by chemical route dispersed in a non-magnetic matrix (non-interacting nanoparticles). Similar to bulk alloy, this system exhibits a maximum of the saturation magnetization at 31% at Co at room temperature, but this maximum is sharp in composition. The powder samples (with interparticle interaction presence) show similar behaviour at RT.xCo1-x shows a broad maximum in the magnetic moment as a function of composition centred in x = 0.65 at 0K (theoretical calculation) and at x = 0.6 for room temperature. We have synthesised 3-nm (FexCo1-x)0.6B0.4 (0<x<1) amorphous nanoparticles by chemical route dispersed in a non-magnetic matrix (non-interacting nanoparticles). Similar to bulk alloy, this system exhibits a maximum of the saturation magnetization at 31% at Co at room temperature, but this maximum is sharp in composition. The powder samples (with interparticle interaction presence) show similar behaviour at RT.