Abstract
We report the fabrication of high crystal quality epitaxial thin films of maghemite (γ−Fe2O3), a classic ferrimagnetic insulating iron oxide. Spin Seebeck effect (SSE) measurements in γ−Fe2O3/Pt bilayers as a function of sample preparation conditions and temperature yield a SSE coefficient of 0.5(1) μV/K at room temperature. Dependence on temperature allows us to estimate the magnon diffusion length in maghemite to be in the range of tens of nanometers, in good agreement with that of conducting iron oxide magnetite (Fe3O4), establishing the relevance of spin currents of magnonic origin in magnetic iron oxides.
Highlights
The study of correlations between spin and thermal currents has received much attention during the last decade, along with the designation of spin caloritronics or thermospintronics, and established as a field within the discipline of spintronics.[1]
The other issue is more fundamental: most theoretical models rely on the generation of magnonic spin current in the FM (JmS ag) and its injection by spin pumping into the NM, where it is carried by itinerant electrons (JcS-el).[3,4,5,7]
This spin current is often detected by its conversion in charge current due to Inverse Spin Hall effect (ISHE) in an attached metallic layer, usually Pt due to its high ISHE efficiency.[20]
Summary
The study of correlations between spin and thermal currents has received much attention during the last decade, along with the designation of spin caloritronics or thermospintronics, and established as a field within the discipline of spintronics.[1]. Spin Seebeck effect in insulating epitaxial γ−Fe2O3 thin films
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