Patent ID: 9396782
Filing Date: 2016-07-19
CPC Classification: G11C

Claim Text:
1. A method for writing to a random access memory (MRAM) cell comprising: a magnetic tunnel junction comprising a first ferromagnetic layer having a first magnetization, a second ferromagnetic layer having a second magnetization that can be adjusted at a high temperature threshold, and a tunnel barrier layer between the first ferromagnetic layer and the second ferromagnetic layer; a transistor in electrical connection with one end of the magnetic tunnel junction; and a field line for passing a field current generating a magnetic field; the method comprising: a first writing step and a second writing step, each writing step comprising: wherein the transistor is a bipolar transistor arranged for controlling the passing of a heating current in the magnetic tunnel junction and changing the heating current polarity, the polarity of the heating current in the first writing step is reversed from the polarity of the heating current in the second writing step, and the second magnetization being adjusted according to the magnetic field, independent of the polarity of the heating current.