Theory 06/Spintronics
Spin Seebeck Scales With Diffusion
The claim
The spin Seebeck voltage is set by the ratio of magnon diffusion length to film thickness, so a thin film can show a larger signal per unit length than a thick one.
01The mechanism
Magnons generated at the interface decay as they travel; the fraction reaching the detector is set by the ratio of decay length to film thickness.
02Predictions
- P1Signal per unit length should track the ratio.
- P2Thickness alone should mispredict.
03Refutation
Signal tracking thickness monotonically would remove the diffusion term.