Close shaped magnetic multi-layer film comprising or not comprising a metal core and the manufacture method and the application of the same

A geometric shaped magnetic multilayer film, including each layer of a conventional magnetic multilayer film deposited on a substrate, characterized in that:

• the cross section of said magnetic multilayer film is a closed elliptic ring, the magnetic moment or flux of the ferromagnetic thin film in the magnetic multilayer film is in clockwise or counter-clockwise closed state;
• wherein the interior minor axis of the elliptic ring shaped magnetic multilayer's cross section is 10-100000 nm, the ratio of minor axis vs. major axis is 1:1-1:5, the exterior minor axis of the ellipse is 20-200000 nm, the width of the ring is 10-100000 nm, said magnetic multilayer film is non-pinning closed ring magnetic multilayer film with double intermediate layers, including a buffering conductive layer, a first hard magnetic layer, a first intermediate layer, a soft magnetic layer, a second intermediate layer, a second hard magnetic layer, and a capping layer;
• said buffering conductive layer is composed of metal materials, and the thickness of which is 2-200 nm;
• said first and second hard magnetic layers are composed of materials having large giant magneto resistance effect, and the thickness of which is 2-20 nm;
• said first and second intermediate layers are composed of non-magnetic metal layer or insulation potential barrier layer, and the thickness of the intermediate layer is 0.5-10 nm;
• said soft magnetic layer is composed of ferromagnetic materials having high spin polarizability and low coercive force, and the thickness of which is 1-20 nm;
• and
• said capping layer is composed of non-oxidable metal materials, and the thickness is 2-20 nm.