Effect of magnons on interfacial thermopower of YIG/metal heterostructures
ORAL
Abstract
We examine substrate-to-film interfacial phonon drag effects on typical spin Seebeck heterostructures, in particular studying the effect of magnons on the phonon-electron drag dynamics of nonmagnetic systems. To explore this concept, we compare the thermopower of Pt films grown on ferrimagnetic YIG to that grown on paramagnetic GGG. To isolate the hypothetical drag contribution from the magnons in YIG into the adjacent Pt film, we design a thermocouple device using a hybrid sample with half GGG/Pt and half GGG/YIG(250nm)/Pt. With a uniform applied temperature gradient, the Pt acts as a differential thermocouple. The effective voltage provides a direct measure of the difference in thermopower of the two systems, which we attribute to magnon dynamics in YIG and their interactions at the YIG/Pt interface. We conduct zero-field, longitudinal thermopower measurements and repeat the experiment using Ag and Al in place of Pt. We also investigate magneto-thermopower and YIG film thickness dependence.
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Presenters
Joseph P Heremans
Mechanical and Aerospace Engineering, The Ohio State University, Mechanical and Aerospace Engineering, Ohio State Univ - Columbus, Ohio State Univ - Columbus, Department of Mechanical and Aerospace Engineering, The Ohio State University
Authors
Arati Prakash
Ohio State Univ - Columbus
Jack Brangham
Physics, The Ohio State University, Ohio State Univ - Columbus, Department of Physics, The Ohio State University
Sarah Watzman
Ohio State Univ - Columbus, The Ohio State University
Fengyuan Yang
Ohio State Univ - Columbus, Physics, Ohio State Univ, Physics, The Ohio State University, Department of Physics, The Ohio State University
Joseph P Heremans
Mechanical and Aerospace Engineering, The Ohio State University, Mechanical and Aerospace Engineering, Ohio State Univ - Columbus, Ohio State Univ - Columbus, Department of Mechanical and Aerospace Engineering, The Ohio State University
