Patent ID: 7826254

Claim:
A magnetic storage device comprising; a line; a soft magnetic body that is formed so as to cover the line either totally or partially; an anti-ferromagnetic layer that is formed on an outer surface of the soft magnetic body; and a magneto-resistive element that is disposed in the vicinity of the line, wherein an equation t<J/(Hc·Ms) is satisfied, where J (erg/cm 2 ) is an exchange coupling energy at a boundary between the soft magnetic body and the anti-ferromagnetic layer, Ms (emu/cc) is a saturation magnetization of the soft magnetic body, Hc (Oe) is a coercive force of the soft magnetic body, and t (cm) is a thickness of the soft magnetic body, wherein the thickness t of the soft magnetic body satisfies an equation t<J/(Hc 2 ·Ms) where Hc 2 (Oe) is an applied magnetic field necessary for the soft magnetic body to reach 80% of the saturation magnetization Ms.