Patent ID: 9123463
Filing Date: 2015-09-01
Classification: B82Y,G11C,H01F,H01L

Abstract:
1. A tunnel barrier layer disposed on a ferromagnetic material layer that is disposed on a substrate, wherein the tunnel barrier layer comprises a poly-crystalline magnesium oxide layer in which a (001) crystal plane is preferentially oriented, wherein the tunnel barrier layer has a barrier height φ in a range of 0.2 to 0.5 e V, where the barrier height φ is obtained by fitting J-V characteristics of a tunnel barrier junction structure to an equation (1): where J is a tunnel current density flowing through the tunnel barrier layer, V is an applied bias voltage that is 100 mV or smaller, m is the free electron mass, e is the elementary electric charge, h is the Plank's constant, Δs is an effective thickness of the tunnel barrier layer that is approximately equivalent to (t wherein the ferromagnetic material layer comprises CoFeB alloy that is at least partially crystallized.