Patent ID: 7633723

Claim:
A tunnel junction device, comprising ferromagnetic electroconductive electrodes and a tunneling film arranged between the ferromagnetic electroconductive electrodes, the ferromagnetic electroconductive electrodes each comprising an A 1-X B X MO 3-δ oxide, wherein X satisfies the condition: 0≦X≦1; δ represents an oxygen deficiency; A represents an element selected from the group consisting of Ca, Sr, Ba, and other alkaline earth elements, La and other rare earth elements, elements comprising Y and Bi; B represents another element which is different from A, selected from the group consisting of Ca, Sr, Ba, and other alkaline earth elements, La and other rare earth elements, and oxides comprising Y and Bi; and M represents a transition metal such as Mn, Fe, Co, Ni, or Cu, and wherein the tunneling film has a three-layer structure of upper and lower layers capable of feeding charges; and a core layer arranged between the upper and lower layers.