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Summary of results on sample GX140

Summary of results on sample GX140. Data and Macrospin simulation. System. Ta(5 nm)/Cu(30 nm)/Pt(3nm) [Co(0.25nm) /Pt(0.52nm)]*4/ Co(0.25nm)/[Ni(0.6 nm)/Co (0.1 nm)]*2 /Cu(4nm )/ [Co (0.1 nm) /Ni(0.6 nm)]*2/Co(0.2 nm) / Pt(3 nm)/ Cu(20 nm)/ Ta(5 nm). Free Layer. Reference Layer. Easy Axis.

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Summary of results on sample GX140

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  1. Summary of results on sample GX140 Data and Macrospin simulation

  2. System Ta(5 nm)/Cu(30 nm)/Pt(3nm)[Co(0.25nm) /Pt(0.52nm)]*4/ Co(0.25nm)/[Ni(0.6 nm)/Co (0.1 nm)]*2/Cu(4nm)/[Co (0.1 nm) /Ni(0.6 nm)]*2/Co(0.2 nm)/Pt(3 nm)/ Cu(20 nm)/ Ta(5 nm) Free Layer Reference Layer Easy Axis

  3. Phase diagram of 100x100nm sampleField Along easy axis I=0.003+0.033B P AP I=-0.007-0.0375B We have a coercive field of ~0.1T

  4. Phase diagram of 100x100nm sampleField AT 45DEGREES I=0.003+0.032B P AP I=-0.007- 0.023B We have a coercive field very close to the on axis case

  5. Example of Pulse measurement

  6. Pulse diagram of 100x100nm sampleField Along Easy AxisP->AP

  7. Pulse diagram fitting of 100x100nm sampleField Along Easy AxisP->AP

  8. Pulse diagram of 100x100nm sampleField at 30degreesAP->P

  9. Pulse diagram fitting of 100x100nm sampleField at 30degreesAP->P

  10. Pulse diagram of 100x100nm sampleField at 45degreesp->AP Low resolution measurements

  11. Pulse diagram fitting of 100x100nm sampleField at 45 degreesP->AP

  12. Pulse diagram of 50x50nm sampleField Along Easy AxisAP->P

  13. Pulse diagram fitting of 50x50nm sampleField along easy axisAP->P

  14. Extrapolated Critical Currents Field along easy axis 100x100nm

  15. Extrapolated critical current and phase diagram

  16. Extrapolated Critical Currents Field along easy axis 50x50nm

  17. Extrapolated Critical Currents Field at 30 degrees

  18. Extrapolated Critical Currents Field at 45degrees

  19. Extrapolated critical current and phase diagram

  20. Macrospintheory • J.Z Sun, PRB62, Spin current interaction with a monodomain magnetic body A [Hz/V] characterizes dynamic evolution

  21. Evolution of A with fieldField along easy axis 100x100nm

  22. Evolution of A with fieldField along easy axis 50x50nm

  23. Evolution of A with fieldField at 30degrees 100x100nm

  24. Evolution of A with fieldField at 45degrees 100x100nm

  25. Macrospin simulation parameters100x100nm sample • Coercive field (Bc): hysteresis curve0.1T • Dipolar field(Hdip): asymmetry of hysteresis curve0.02T (not included in simulation) • Saturation Magnetization (Ms): average of Co and Ni saturation magnetization weighted by thickness713000 A/m • Anisotropy constant(K): deduced from the coercive field and Ms3.55e5 J/m3

  26. Macrospin simulation parameters • ~1.17 deduced from extrapolated critical currents • Polarization(P~0.2): extracted from fitting parameter A • Damping constant : deduced from previous values~0.23 Asymmetry of spin torque, deduced from phase diagram Current/Amplitude conversion factor

  27. Phase Diagram P P AP AP

  28. Extrapolated Critical AmplitudeP->AP

  29. Extrapolated Critical Amplitude SimulationAP->P

  30. Fitting Parameter A scaling with FieldP->AP

  31. Fitting Parameter A scaling with FieldSimulationAP->P

  32. Reverse Analysis of simulation data P->AP

  33. Reverse Analysis of simulation dataAP->P

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