Theory 05/Spintronics
Switching Is an Anisotropy Ratio
The claim
Spin-torque switching current is set by the ratio of magnetic anisotropy energy to spin-torque efficiency, so two devices with the same anisotropy need different currents.
01The mechanism
Switching requires the torque to overcome the anisotropy barrier within the pulse; the ratio sets the current needed for a given pulse length.
02Predictions
- P1Switching current should track the ratio.
- P2Anisotropy alone should mispredict across materials.
03Refutation
Switching current tracking anisotropy would remove the efficiency term.