Spin transfer torque magnetisation switching in MgO based magnetic tunnel junctions

Abstract

Magnetic tunnel junctions (MTJ) are important magnetic elements that are used as memory and sensor devices. In this thesis, first, the fundamentals of MTJs were explored by investigating different tunnel barrier materials, then, a new physical phenomenon called spin transfer torque magnetisation switching (STS) was investigated in nanopillars with magnesium oxide based MTJs with a view to reducing the critical current density (Jc) required to switch the magnetisation. This is a technological challenge at present.