The invention provides a magnetic multilayer film unit, comprising a magnetic multilayer film core unit and a
magnetic moment control unit, wherein the magnetic multilayer film core unit comprises a free layer; the
magnetic moment control unit comprises two conducting
layers; and the free layer of the magnetic multilayer film core unit is positioned in an
electric field formed by the two conducting
layers. In addition, the invention also provides a corresponding preparation method and a
magnetic moment overturning control method of the magnetic multilayer film unit. In the invention, the
power consumption of the devices is greatly reduced, and the integration level of the devices can be improved; a preparation process and a
semiconductor process are compatible so as to be beneficial to large-scale industrial production; and the magnetic multilayer film unit is beneficial to
miniaturization of spintronic devices and has the
advantage of
radiation resistance. The magnetic multilayer film unit can be widely applied in the spintronic devices such as logic devices, nonvolatile storages,
spinning transistors and various sensors and the like in the field of the future computer information
communication industry. The invention is beneficial to widening of the application range of the spintronic devices.