Patent ID: 9093632
Filing Date: 2015-07-28
Classification: H01L

Abstract:
1. A nonvolatile semiconductor memory device comprising: a magnetoresistive element formed on a semiconductor substrate; a first contact plug which extends through an interlayer dielectric film formed on the semiconductor substrate and immediately below the magnetoresistive element, has a bottom surface in contact with an upper surface of the semiconductor substrate, and is adjacent to the magnetoresistive element; and an insulating film formed between the magnetoresistive element and the first contact plug and on the interlayer dielectric film, wherein the insulating film includes a first region positioned on a side of the interlayer dielectric film, and a second region positioned in the insulating film and on an upper surface of the first region, the insulating film is made of SiN, and the first region is a nitrogen-rich film compared to the second region.