Patent ID: 7582890

Claim:
A magnetic tunnel junction structure having a pinned layer pattern, a tunneling insulation layer pattern and a free layer pattern, which are stacked on an integrated circuit substrate, at least the free layer pattern comprising: a rectangular main body having first and second sides that face each other, the first side of the main body being along an outer surface of at least the free layer pattern, a third side extended from one end of the first side to contact one end of the second side, and a fourth side extended from the other end of the first side to contact the other end of the second side; a first tip protruding from a first vertex corresponding to a contact point of the second and third sides, an outer surface of the first tip contacting the second and third sides, and the first tip being bent to have a configuration of a rounded curve, wherein the first vertex is on a same side of the first tip as a center of curvature of the rounded curve of the first tip; and a second tip protruding from a second vertex corresponding to a contact point of the second and fourth sides, an outer surface of the second tip contacting the second and fourth sides, and the second tip being bent to have a configuration of a rounded curve, wherein the second vertex is on a same side of the second tip as a center of curvature of the rounded curve of the second tip, and wherein the first and second tips expose the first and second sides.