Perpendicular spin-torque switching with a synthetic antiferromagnetic

摘要

Spin-torque switching of perpendicular anisotropy nanopillar spin valve devices with syntheticnantiferromagnetic reference layers is presented. The use of composite reference layer reduces thendipolar interaction with the free layer yielding two remanent states. We derive a completencurrent-field phase diagram including minor loops of the free layer where we determine the relativendipolar fields and effective spin polarization of the reference layer in both the parallel andnantiparallel configurations. We find the magnetic response of the reference layer relativelyninsensitive to the spin polarized current which may prove advantageous for spin-torquenapplications. © 2010 American Institute of Physics. u0004doi:10.1063/1.3441402