Patent ID: 7408802
Filing Date: 2008-08-05
Classification: G11C,H01L

Abstract:
1. A magnetoresistive random access memory (MRAM) unit comprising: a substrate; a plurality of transistors formed on said substrate, each of said plurality of transistors being a field-effect transistor comprising a first source/drain electrode, a second source/drain electrode and a gate electrode; a plurality of active areas defined in a common memory block comprising a ferromagnetic recording layer, a free magnetic reading layer, a non-magnetic space layer between said ferromagnetic recording layer and said free magnetic reading layer; a plurality of contacts, each of said plurality of contacts electrically connecting a respective one of said first source/drain electrodes with a corresponding one of said plurality of active areas; and a common electrode in electrical contact with said plurality of contacts through said common memory block, said common electrode serving as bit line for said first source/drain electrodes; wherein each of said plurality of active areas forms an effective magnetoresistive element; and wherein each of said plurality of transistors is controllable to electrically activate a corresponding one of said plurality of contacts and thereby to write/read a data bit into/from said ferromagnetic recording layer at a respective one of said effective magnetoresistive elements.