COFESIB/PT MULTILAYERS EXHIBITING PERPENDICULAR MAGNETIC ANISOTROPY

摘要

A CoFeSiB/Pt(Cobalt-Ferrum-Silicone-Boron/Platinum) multi-layer thin film with perpendicular magnetic anisotropy is provided to secure low coercivity, remanent magnetization similar to saturation magnetization, and low saturation magnetization and to minimize the consumption of power. A CoFeSiB/Pt multi-layer thin film with perpendicular magnetic anisotropy is composed of: a first Pt/CoFeSiB layer; a second Pt/CoFeSiB layer formed on the first Pt/CoFeSiB layer; a third Pt/CoFeSiB layer formed on the second Pt/CoFeSiB layer; and a fourth Pt/CoFeSiB layer formed on the third Pt/CoFeSiB layer. The thickness ratio of the first and second Pt/CoFeSiB layers is 1:1. Coercivity of the multi-layer thin film with perpendicular magnetic anisotropy is below 200e. If the thickness of Pt is 8 angstroms, the thickness of CoFeSiB is 3 angstroms. Or, if the thickness of CoFeSiB is 3 angstroms, Pt is over 14 angstroms.