Patent ID: 9337413
Filing Date: 2016-05-10
CPC Classification: G11C,H01L

Claim Text:
1. A multi-state current-switching magnetic memory element configured to store a state by current flowing therethrough to switch the state comprising: a first magnetic tunnel junction (MTJ) formed on top of a bottom electrode; a second MTJ, formed on top of the first MTJ and separated from the first MTJ by an amorphous isolation layer; and a top electrode formed on top of the second MTJ, each of the first and second MTJs having a free layer with a switchable magnetic orientation, a barrier layer and a fixed layer, the first and second MTJs collectively operable to store more than one bit of information, wherein each of the first and second MTJs store one bit of information, each of the free layers of the first and second MTJs having a different composition based on an amount of oxide therein, and each of the free layers of the first and second MTJs being responsive to a unique switching current based on the composition of each free layer, wherein the free layer switches its magnetic orientation based upon a level of a switching current applied thereto, further wherein application of different levels of current to the multi-state current-switching magnetic memory element causes switching to different states.