Patent ID: 7897412
Filing Date: 2011-03-01
Classification: B82Y,G11C,H01F,H01L

Abstract:
1. A method of manufacturing an MRAM having a transistor and an MTJ layer in a unit cell, formation of the MTJ layer comprising: forming a lower magnetic layer; forming an oxidation preventing layer on the lower magnetic layer, the oxidation preventing layer being an oxide layer, wherein the oxidation preventing layer is formed of an AlO forming a tunneling oxide layer on the oxidation preventing layer by an atomic layer deposition (ALD) method, wherein the tunneling oxide layer is formed of one of an AlO forming an upper magnetic layer on the tunneling oxide layer, wherein the lower magnetic layer, the oxidation preventing layer, the tunneling oxide layer, and the upper magnetic layer are sequentially stacked and the oxidation preventing layer is arranged between the lower magnetic layer and the upper magnetic layer, and wherein at least the oxidation preventing layer is formed by a method other than the ALD method, the oxidation preventing layer being formed by sputtering a metal layer on the lower magnetic layer and oxidizing the metal layer using a natural oxidation method or an ultraviolet (UV) oxidation method.