Magnetization enhancement in Fe–Co–B alloy nanoparticles

✍ Scribed by B. Molina Concha; R.D. Zysler; H. Romero

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 181 KB
• Volume: 384
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2006.06.009

✦ Synopsis

Co-Fe alloy may have magnetic moment higher than that of pure metallic Fe or Co. Particularly, bulk Fe x Co 1Àx shows a broad maximum in the magnetic moment as a function of composition centred in x ¼ 0:65 at 0 K (theoretical calculation) and at x ¼ 0:6 for room temperature. We have synthesised 3-nm (Fe x Co 1Àx ) 0.6 B 0.4 (0pxp1) 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.