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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.
Nature Materials
|May 16, 2017
Summary
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.
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.
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