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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Giant thermal Hall effect in multiferroics.

T Ideue1, T Kurumaji2, S Ishiwata1,3

  • 1Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.

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Researchers discovered a giant thermal Hall effect in multiferroic materials. This unprecedented coupling between magnetism and phonons offers new ways to control heat flow using magnetic fields.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Multiferroics exhibit coupled dielectric and magnetic orders, enabling novel functionalities.
  • Lattice-spin interactions significantly influence elementary excitations in multiferroic systems.

Purpose of the Study:

  • To investigate the coupling between magnetism and phonons in multiferroics.
  • To explore the thermal transport properties and identify new phenomena.

Main Methods:

  • Investigated thermal transport in insulating polar magnets (ZnₓFe₁₋ₓ)₂Mo₃O₈.
  • Analyzed the influence of magnetic structure on phonon-dominated thermal conductivity.

Main Results:

  • Observed an unprecedented giant thermal Hall effect in the ferrimagnetic phase.
  • Demonstrated that thermal transport is highly sensitive to magnetic structure.
  • Identified unconventional lattice-spin interactions driving the thermal Hall effect.

Conclusions:

  • The giant thermal Hall effect in multiferroics provides a new mechanism for the Hall effect in insulators.
  • This phenomenon serves as an effective probe for strong lattice-spin interactions.
  • Offers a novel approach for magnetic control of thermal currents.