Enhancement of spin Seebeck effect in Fe3O4/Pt thin films with α -Fe nanodroplets

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Abstract
In this study, we demonstrate an enhancement of the measured spin Seebeck coefficient in Fe3O4/Pt bilayer films due to an increase in Fe nanodroplets formed by pulsed laser deposition. Four bilayer films were deposited at the same time from a highly textured target, resulting in a general increase in droplet formation that was confirmed to be Fe rich by scanning electron microscope and transmission electron microscope-dispersive x-ray spectroscopy. Of these four films, there were two distinct groupings with differing density of α-Fe droplets, where the bilayer with higher droplet density exhibited a 64% increase in the measured spin Seebeck coefficient from 38 to 63 nV m/W.
Funding Information
  • Engineering and Physical Sciences Research Council (EP/P006221/1)
  • Horizon 2020 Framework Programme (101001290)

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