What question did this study set out to answer?

To calculate how finite magnon-phonon thermal relaxation times alter nonequilibrium temperature gradients and dictate the experimental observability of magnon heat transport in magnetic insulators.

February 1, 1977Physical review. B, Solid state

Effect of magnon-phonon thermal relaxation on heat transport by magnons

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To calculate how finite magnon-phonon thermal relaxation times alter nonequilibrium temperature gradients and dictate the experimental observability of magnon heat transport in magnetic insulators.
Reviewed experimental evidence for magnon heat conduction across magnetic insulator systems.
Formulated a transport calculation coupling intrinsic magnon conductivity and phonon conductivity through a finite magnon-phonon relaxation time.
Evaluated the theoretical model using empirical magnetic-resonance relaxation parameters for ferrimagnetic yttrium iron garnet (YIG) and antiferromagnetic manganese fluoride (MnF2).
In the limit of very long relaxation times, experimental thermal conductivity measurements detect exclusively phonon conductivity, regardless of the magnitude of intrinsic magnon conductivity.
A sufficiently short relaxation time in YIG permits magnon heat conduction to be observed, matching experimental measurements.
The long relaxation time in MnF2 suppresses magnon temperature gradients, providing an explanation for the experimentally observed absence of magnon conductivity.

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Implication

Theoretical modeling reveals that magnon-phonon relaxation governs observable magnon heat transport in magnetic insulators, explaining why magnon conductivity appears in YIG but not MnF2.

Cite This Study

Sanders et al. (1977) studied this question.

synapsesocial.com/papers/6a71278de36a167817e2fb53 https://doi.org/10.1103/physrevb.15.1489

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Implication

Theoretical modeling reveals that magnon-phonon relaxation governs observable magnon heat transport in magnetic insulators, explaining why magnon conductivity appears in YIG but not MnF2.

Effect of magnon-phonon thermal relaxation on heat transport by magnons

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Discussion

Implication

Cite This Study

Effect of magnon-phonon thermal relaxation on heat transport by magnons

Key Points

Discussion

Implication

Cite This Study

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