Nanocrystalline ribbon are manufactured using high-speed planar continuous casting technology, which casts molten metal in a single step into amorphous thin ribbon with a thickness of 10 to 50 μm at a cooling rate of one million degrees per second. This process achieves the shortest possible metallurgical workflow and is hailed as a technological revolution in the field of metallurgy. Nanocrystalline alloys are produced by adding metallic elements such as silicon and copper to the composition of amorphous alloys. Through nanocrystallization annealing, they form a unique amorphous-nanocrystalline dual-phase composite structure, which exhibits higher magnetic permeability and lower core loss.