Patent ID: 8824202

Claim:
A method for writing and reading a magnetic random access memory (MRAM) cell comprising a magnetic tunnel junction formed from a sense layer having a magnetization direction that can be freely aligned, a storage layer having a magnetization direction that can be switched when the magnetic tunnel junction is heated to a high temperature threshold and that is pinned when the magnetic tunnel junction is at a low temperature threshold, and an insulating layer being disposed between the sense and a storage layers; a field line in communication with the magnetic tunnel junction; and a current line electrically connected to the magnetic tunnel junction; the method comprising : during a write operation, passing a saturation field current in the field line to induce a saturation magnetic field; saturating the magnetization of the sense layer in a direction according to the induced saturation magnetic field for inducing a local magnetic field; and switching said magnetization of said storage layer according to the local magnetic field; and during a read operation, aligning magnetization direction of said sense layer in a first aligned direction; comparing said write data with said first aligned direction by measuring a first resistance value of said magnetic tunnel junction; aligning the magnetization of the sense layer in a second aligned magnetization direction; comparing said write data with said second aligned direction by measuring a second resistance value of said magnetic tunnel junction; and determining a difference between the first resistance value and the second resistance value.