Patent ID: 8139325
Filing Date: 2012-03-20
Classification: B82Y,G11B,G11C,H01F,H01L

Abstract:
1. A tunnel magnetoresistive thin film comprising: an anti-ferromagnetic layer; a tunnel barrier layer; a first pinned magnetic layer located on the side of the anti-ferromagnetic layer and containing a magnetic material and boron atom; a second pinned magnetic layer located on the side of the tunnel barrier layer and containing a magnetic material and boron atom; a non-magnetic layer for exchange coupling located between the first pinned magnetic layer and the second pinned magnetic layer; and a free magnetic layer, wherein: the first pinned magnetic layer has an anti-ferromagnetic layer side layer, which is located on the side of the anti-ferromagnetic layer, and a non-magnetic layer for exchange coupling side layer, which is located on the side of the non-magnetic layer for exchange coupling; and the content ratio of the boron atom contained in the anti-ferromagnetic layer side layer of the first pinned magnetic layer is larger than the content ratio of the boron atom contained in the non-magnetic layer for exchange coupling side layer of the first pinned magnetic layer.