What is it about?
Spin currents are constituent elementary quantities in spintronics like electric currents in electronics. The detection of the spin current has been limited to macroscopic voltage measurements, and there has been a lack of understanding of how the spin current propagates inside the material. We used neutron scattering together with the voltage measurement and have shown that magnetic excitation information gives an intuitive prediction of the spin current as a function of temperature.
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Why is it important?
Our findings have demonstrated the importance of microscopic information for spintronics research. The spin currents in insulating magnets can generally be understood once the magnetic excitations, with their temperature variation and magnon polarization (the direction of the precession motion of magnetic moments), are clarified. The study is expected to enable the prediction of spin currents, which will lead to the development of new materials with better performance.
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This page is a summary of: Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12, Applied Physics Letters, March 2024, American Institute of Physics,
DOI: 10.1063/5.0197831.
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