Magnetic memory device and method of fabricating the same

A method of forming nonvolatile magnetic memory-cells in a semiconductor magnetic memory device, the method comprising:

• forming an invariable pinning pattern and a variable pinning pattern on a substrate, the variable pinning pattern including a first surface and a second surface opposite to the first surface;
• forming a tunnel barrier pattern between the invariable pinning pattern and the variable pinning pattern;
• forming a pinned pattern between the invariable pinning pattern and the tunnel barrier pattern, the pinned pattern having a magnetization direction pinned by the invariable pinning pattern;
• forming a storage free pattern between the tunnel barrier pattern and the variable pinning pattern;
• forming a guide free pattern between the storage free pattern and the variable pinning pattern, the guide free pattern directly contacting the first surface of the variable pinning pattern;
• forming a free reversing pattern between the storage and guide free patterns, the free reversing pattern reversing a magnetization direction of the storage free pattern and a magnetization direction of the guide free pattern in the opposite directions;
• forming a resistance pattern contacting with the second surface of the variable pinning pattern, the resistance pattern for generating Joule's heat, wherein data is stored and retrieved to and from the memory cells via current through the memory cells, and the semiconductor magnetic memory device including a switching device,
• wherein the invariable pinning pattern and the variable pinning pattern are each formed of an antiferromagnetic substance, the invariable pinning pattern being thicker than the variable pinning pattern.