Can I read Co-resonant Enhancement of Spin-torque Critical Currents in Spin-valves with Synthetic-ferrimagnet Free-layer on EtoBox?

Co-resonant Enhancement of Spin-torque Critical Currents in Spin-valves with Synthetic-ferrimagnet Free-layer by Smith, Neil; Maat, Stefan; Carey, Matthew J.; Childress, Jeffrey R. is a scholarly article available to read on EtoBox.

What is Co-resonant Enhancement of Spin-torque Critical Currents in Spin-valves with Synthetic-ferrimagnet Free-layer about?

It is experimentally shown that the critical current for onset of spin-torque instability in current-perpendicular-to-plane spin-valves can be strongly enhanced using "synthetic ferrimagnet" free-layers of form FM1/Ru/FM2 (FM=ferrromagnet). However, this enhancement occurs for only one polarity of bias current. A two-macrospin model is shown to reproduce the observations. The model suggests that this phenomenon is related to a polarity-dependent, spin-torque induced co-resonance between the two natural dynamic modes of the FM1/FM2 couple. The resonance condition facilitates energy transfer out of the spin-torque destabilized mode into the other stable mode whose effective damping is actually enhanced by spin-torques, thereby delaying the onset of instability of this coupled system to larger critical currents.

Author

Smith, Neil; Maat, Stefan; Carey, Matthew J.; Childress, Jeffrey R.

Published

2008

Language

EN