To realize the potential of spintronics, ferromagnetic nanowires with strong coercivity are required, and L10-ordered cobalt–platinum nanowires in particular.
Eradicating the etching procedure by directly manufacturing nanowires onto the silicon substrate might result in a significant breakthrough in spintronic device fabrication. Unfortunately, when directly fabricated nanowires are annealed, the inherent stresses in the wire cause them to change into droplets.
Our nanostructure-induced ordering method allows the direct fabrication of ultrafine L10-ordered CoPt nanowires with the narrow widths of 30nm scale required for spintronics. This fabrication method could further be applied to other L10-ordered ferromagnetic materials such as iron–platinum and iron–palladium compounds.
Researchers discovered that the nanowires acquired L10-ordering throughout the annealing procedure. This transition was caused by atomic interdiffusion, surface diffusion, and exceptionally high internal stress at the nanowires’ ultrasmall curvature radii of 10 nm. They also discovered that the nanowires have a high coercivity of 10 kiloOersteds .