Patent ID: 7781230

Claim:
An electro-resistance element, comprising: a substrate; and a multilayer structure disposed on the substrate, the multilayer structure including an upper electrode, a lower electrode, and an electro-resistance layer disposed between the upper and the lower electrodes, the electro-resistance element having two or more states in which electric resistance values between the upper and the lower electrodes are different, and being switchable from one of the two or more states into another by applying a predetermined voltage or current between the upper and the lower electrodes, wherein the electro-resistance layer includes Fe 2 O 3 , and an amount of Fe 3 O 4 contained in the electro-resistance layer is 0% to 20% of an amount of Fe 2 O 3 in percent by weight, the lower electrode is made of an iron oxide containing Fe 3 O 4 , and having a different composition from the electro-resistance layer, and the electro-resistance layer and the lower electrode make contact with each other.