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Generalized two-temperature model for coupled phonon-magnon diffusion.

Bolin Liao1, Jiawei Zhou1, Gang Chen1

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|July 26, 2014
PubMed
Summary
This summary is machine-generated.

This study extends the two-temperature model to include magnetization flow, revealing a novel magnon cooling effect in ferromagnets under nonuniform magnetic fields. This phenomenon could enhance cryogenic applications.

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Area of Science:

  • Condensed Matter Physics
  • Thermodynamics
  • Materials Science

Background:

  • The Sanders-Walton two-temperature model describes coupled phonon-magnon diffusion.
  • Understanding heat transport in magnetic materials is crucial for technological applications.

Purpose of the Study:

  • To generalize the two-temperature model by incorporating magnetization flow.
  • To investigate the thermal effects of magnon flow, particularly under nonuniform magnetic fields.
  • To explore potential cryogenic applications.

Main Methods:

  • Generalization of the two-temperature model for coupled phonon-magnon diffusion.
  • Utilizing the Boltzmann transport equation to derive constitutive equations and conservation laws.
  • Analysis of heat transport driven by temperature and magnetic field gradients.

Main Results:

  • Derived equations for coupled phonon-magnon transport including magnetization flow.
  • Predicted a new magnon cooling effect in homogeneous single-domain ferromagnets subjected to nonuniform magnetic fields.
  • Estimated the cooling effect in yttrium iron garnet, demonstrating experimental feasibility.

Conclusions:

  • The generalized model accurately describes phonon-magnon transport under various field conditions.
  • The predicted magnon cooling effect offers a new avenue for thermal management in magnetic materials.
  • This effect holds promise for future cryogenic applications, potentially supplementing magnetocaloric cooling.