Temperature dependence of the mean magnon collision time in a spin Seebeck device

•The main scattering processes of YIG are defects or boundaries and other magnons.•Scattering by defects in a bulk YIG provides a mean free path around 10 microns.•The scattering at the boundaries is main process for films below 10 microns.•Collisions with magnons depends on T−4 as for the magnon-ma...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2021-11, Vol.538, p.168289, Article 168289
Main Authors: Basso, Vittorio, Sola, Alessandro, Ansalone, Patrizio, Kuepferling, Michaela
Format: Article
Language:English
Subjects:
Bilayers
High temperature
Low temperature
magnon scattering
Magnons
Relaxation time
Scattering
Seebeck effect
Spin Seebeck effect
Temperature dependence
Thin films
yttrium iron garnet
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Summary:•The main scattering processes of YIG are defects or boundaries and other magnons.•Scattering by defects in a bulk YIG provides a mean free path around 10 microns.•The scattering at the boundaries is main process for films below 10 microns.•Collisions with magnons depends on T−4 as for the magnon-magnon scattering theory. Based on the relaxation time approximation, the mean collision time for magnon scattering τc(T) is computed from the experimental spin Seebeck coefficient of a bulk YIG/ Pt bilayer. The scattering results to be composed by two processes: the low temperature one, with a T-1/2 dependence, is attributed to the scattering by defects and provides a mean free path around 10 μm; the high temperature one, depending on T-4, is associated to the scattering by other magnons. The results are employed to predict the thickness dependence of the spin Seebeck coefficient for thin films.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2021.168289