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Ferromagnetos binarios a base de hierro para la conversión termoeléctrica transversal

Akito Sakai1,2,3, Susumu Minami4,5, Takashi Koretsune6

  • 1Institute for Solid State Physics, University of Tokyo, Kashiwa, Japan.

Nature
|May 8, 2020
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores mejoraron el efecto anómalo de Nernst (ANE) para la recolección de energía mediante el dopaje de hierro con aluminio y galio. Este avance aumenta el rendimiento termoeléctrico y el potencial de los materiales para generadores flexibles.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Física de la materia condensada
  • Física del estado sólido

Sus antecedentes:

  • La generación termoeléctrica que utiliza el efecto Nernst anómalo (ANE) ofrece potencial para la recolección de energía debido a su geometría transversal.
  • Mejorar el rendimiento, el costo, la seguridad y la estabilidad de las ANE es crucial para las aplicaciones prácticas.
  • El ANE se origina en la curvatura de Berry de los electrones de conducción cerca de la energía de Fermi.

Objetivo del estudio:

  • Para buscar computacionalmente materiales que mejoren dramáticamente el efecto Nernst anómalo.
  • Investigar la estructura electrónica responsable de la mejora de las ANE.
  • Desarrollar generadores termoeléctricos rentables y flexibles.

Principales métodos:

  • Búsqueda computacional de alto rendimiento de sustancias dopantes en hierro alfa.
  • Investigando la estructura electrónica y la curvatura de Berry.
  • Fabricación de películas delgadas para la validación experimental.

Principales resultados:

  • El dopaje de hierro alfa con un 25% de aluminio o galio aumenta la ANE en más de diez veces.
  • Se obtienen valores ANE de aproximadamente 4 y 6 microvoltios por kelvin a temperatura ambiente.
  • Identificó el ajuste de energía de Fermi a una red nodal como clave para una fuerte mejora del coeficiente termoeléctrico transversal.

Conclusiones:

  • El hierro dopado aumenta significativamente el ANE, acercándose a valores récord.
  • El ajuste de energía de Fermi a las estructuras nodulares es crítico para un alto rendimiento de ANE.
  • Las películas finas fabricadas demuestran el potencial de generadores termoeléctricos flexibles y de bajo costo.