Method and system for providing magnetic junctions having a thermally stable and easy to switch magnetic free layer

A magnetic memory comprising:

• a plurality of magnetic storage cells, each of the plurality of magnetic storage cells including at least one magnetic junction, the at least one magnetic junction includes a pinned layer, a nonmagnetic spacer layer and a free layer having a plurality of subregions, each of the plurality of subregions having a magnetic thermal stability constant, the plurality of subregions being ferromagnetically coupled such that the free layer has a total magnetic thermal stability constant;
• the magnetic thermal stability constant being such that the each of the plurality of subregions is magnetically thermally unstable at an operating temperature, the total magnetic thermal stability constant being such that the free layer is magnetically thermally stable at the operating temperature, the magnetic junction being configured such that the free layer is switchable between a plurality of stable magnetic states when a write current is passed through the magnetic junction;
• and
• a plurality of bit lines coupled with the plurality of magnetic storage cells.

A method for providing a magnetic junction for use in a magnetic device comprising:

• providing a pinned layer;
• providing a nonmagnetic spacer layer;
• and
• providing a free layer having a plurality of subregions, each of the plurality of subregions having a magnetic thermal stability constant, the plurality of subregions being ferromagnetically coupled such that the free layer has a total magnetic thermal stability constant;
• the magnetic thermal stability constant being such that the each of the plurality of subregions is magnetically thermally unstable at an operating temperature, the total magnetic thermal stability constant being such that the free layer is magnetically thermally stable at the operating temperature;
• wherein the magnetic junction is configured such that the free layer is switchable between a plurality of stable magnetic states when a write current is passed through the magnetic junction.