A CLOSE SHAPED MAGNETIC MULTI-LAYER FILM COMPRISING OR NOT COMPRISING A METAL CORE AND THE MANUFACTURE METHOD AND THE APPLICATION OF THE SAME

摘要

The each layer in the magnetic multi-layer film is closed ring or oval ring and the magnetic moment or flux of the ferromagnetic film in the magnetic unit is in close state either clockwise or counterclockwise. A magnetic multi-layer film comprises a metal core in the geometry center position in the close shaped magnetic multi-layer film. The cross section of the metal core is a corresponding circular or oval. A MRAM is made of the closed magnetic multi-layer film comprising or not comprising a metal core. The close shaped magnetic multi-layer film is formed by micro process method. The close shaped magnetic multi-layer film can be used broadly in a great variety of device that uses a magnetic multi-layer film as the core, such as MRAM, magnetic head in computer, magnetic sensitive sensor, magnetic logic device and spin transistor.