Patent ID: 8553450
Filing Date: 2013-10-08
Classification: G11C

Abstract:
1. A magnetic random access memory comprising: a first magnetic layer comprising a magnetization fixed along a first direction; a first nonmagnetic layer as a first tunnel barrier on the first magnetic layer; a second magnetic layer on the first nonmagnetic layer comprising a magnetization whose direction can be reversed by spin transfer through current injection; a second nonmagnetic layer as a second tunnel barrier on the second magnetic layer; and a third magnetic layer on the second nonmagnetic layer comprising a magnetization whose direction can be reversed by spin transfer through current injection at a current density different from a current density of the second magnetic layer, wherein the memory comprises a magnetoresistive effect element in which the first magnetic layer, the first nonmagnetic layer, and the second magnetic layer exhibit a first magnetoresistive effect, the second magnetic layer, the second nonmagnetic layer, and the third magnetic layer exhibit a second magnetoresistive effect, and which is configured to record and read out data of at least three levels based on a synthetic resistance from the first and second magnetoresistive effects.