Patent ID: 9666256
Date: 2017-05-30
CPC Classifications: G11C,H01L

Claim:
1. A spin-orbit torque magnetic random access memory (SOT-MRAM), comprising: a substrate; and an SOT memory cell disposed on said substrate and including a magnetic free layer, said magnetic free layer including a first metal film exhibiting ferromagnetic characteristics, and a second metal film contacting said first metal film for generating a spin-Hall effect, wherein said first metal film has a thickness sufficient to allow said magnetic free layer, after being applied with a first external magnetic field which is subsequently removed, to have a remanent-to-saturated magnetization ratio ranging from −0.9 to 0.9, wherein said first metal film, upon being applied with a second external magnetic field and an electric pulse, has multiple magnetic domains when a current density resulting from said electric pulse is greater than a critical value, said magnetic free layer having a magnetic switching behavior when the current density reaches the critical value, wherein said second external magnetic field is provided in a direction identical to said first external magnetic field and less in magnitude than said first external magnetic field.