Patent ID: 7889543
Filing Date: 2011-02-15
Classification: G11C,H01L

Abstract:
1. A magnetic memory element, comprising: a multilayer including: wherein the magnetization direction of a portion of the memory layer being nearest to the first intermediate layer and the magnetization direction of the first fixed layer are anti-parallel to each other whenever the magnetization direction of a portion of the memory layer being nearest to the second fixed layer and the magnetization direction of the second fixed layer are parallel to each other, and vice versa; wherein the memory layer receives a larger perpendicular component of a stray field from the first fixed layer than from the second fixed layer; wherein a current is configured to be passed bi-directionally between the first fixed layer and the second fixed layer; wherein the current is passed in a first direction over a first threshold to make a magnetization direction of the memory layer in the first direction; wherein the current is passed in a second direction over a second threshold to make the magnetization direction of the memory layer in the direction opposite to the first direction; wherein a current is passed between the first fixed layer and the second fixed layer to detect the magnetization direction of the memory layer; wherein an electric conductivity of a nonmagnetic material to constitute the first intermediate layer is lower than an electric conductivity of a nonmagnetic material to constitute the second intermediate layer; wherein a thickness of the first intermediate layer is 1 nm or less; wherein the first fixed layer includes N first ferromagnetic sublayers (N is an integer of 1 or more); wherein the second fixed layer includes M second ferromagnetic sublayers (M is an integer of 1 or more); wherein the memory layer includes P memory ferromagnetic sublayers (P is an integer of 1 or more); and wherein the mathematical formula 2 including the function φ(a, b, d) defined by the mathematical formula 1 is satisfied by a when