Circularly polarized spin current assisted fast resonant switching in magnetic tunnel junctions with perpendicular anisotropy

摘要

We propose a mechanism to substantially enhance spin transfer torque induced switching in perpendicular anisotropy magnetic tunnel junctions. Our method is based on injecting an additional assisting DC current with circular spin polarization into a magnetic free layer at frequencies that are resonant with its normal ferromagnetic resonance frequencies. We observe 80 % reduction in switching delays at constant switching currents and 2 × improvement in critical switching current density. Spin current polarization chirality and spin polarization efficiency dependencies are investigated. Further, a device structure to experimentally realize the mechanism proposed in this letter is presented.