Patent ID: 6937447

Claim:
A magnetoresistance effect element comprising: a first ferromagnetic layer; an insulating layer overlying said first ferromagnetic layer; and a second ferromagnetic layer overlying said insulating layer, wherein said insulating layer has a through hole penetrating its thickness direction at its predetermined position, said first ferromagnetic layer and said second ferromagnetic layer being electrically connected to each other via said through hole to form a connected portion between said first and second ferromagnetic layers, and said through hole having an opening width not larger than 20 nm, an electric resistance between said first ferromagnetic layer and said second ferromagnetic layer changes in accordance with a change of a relative arrangement of magnetizations of said first and second ferromagnetic layers, and an additive element which is different from elements composing said first and second ferromagnetic layers is incorporated at said connected portion between said first and second ferromagnetic layers, and a thickness of said connected portion where said additive element is incorporated is not larger than 10 atomic layers.