Patent ID: 9720056
Date: 2017-08-01
CPC Classifications: A61B,G01R,G11B,H01L

Claim:
1. A magnetic sensor comprising: a channel layer; a magnetization free layer placed on a first section of the channel layer; and a magnetization-fixed layer placed on a second section of the channel layer, wherein an interface between the channel layer and the magnetization free layer has an areal resistance that is lower than an areal resistance of an interface between the channel layer and the magnetization-fixed layer, and the magnetization free layer includes a first ferromagnetic sub-layer and a first tunnel barrier sub-layer placed between the first ferromagnetic sub-layer and the channel layer, the magnetization-fixed layer includes a second ferromagnetic sub-layer and a second tunnel barrier sublayer placed between the second ferromagnetic sub-layer and the channel layer, and the first tunnel barrier sub-layer has a thickness that is less than a thickness of the second tunnel harrier sub-layer.