Patent ID: 8421138
Filing Date: 2013-04-16
Classification: H01L

Abstract:
1. A magnetic tunneling junction device comprising: a magnetic pinned layer formed over a substrate; an insulating film formed over the magnetic pinned layer; a recess formed in and through the insulating film; a tunneling insulating film formed on a bottom of the recess; a first magnetic free layer formed over the tunneling insulating film; a second magnetic free layer formed over the insulating film and made of a same magnetic material as the first magnetic free layer; a non-magnetic film formed on side walls of the recess, extending from the first magnetic free layer to the second magnetic free layer and made of oxide of the magnetic material of the first magnetic free layer; and an upper electrode disposed over the first magnetic free layer, the non-magnetic film and the second magnetic free layer, and electrically connected to the first magnetic free layer and the second magnetic free layer.