Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-08-14
Physics
Condensed Matter
Other Condensed Matter
10 pages (manuscript form), with 4 embedded figures. Submitted for publication. Version #2 contains one additional equation (E
Scientific paper
10.1103/PhysRevLett.101.247205
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.
Carey Matthew J.
Childress Jeffrey R.
Maat Stefan
Smith Neil
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