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El túnel Magneto-Seebeck a escala atómica

Cody Friesen¹, Hermann Osterhage², Johannes Friedlein²

¹Department of Physics, University of Hamburg, Jungiusstrasse 11A, 20355 Hamburg, Germany. cfriesen@physnet.uni-hamburg.de skrause@physnet.uni-hamburg.de.

Science (New York, N.Y.)

|March 9, 2019

Resumen

Los investigadores mapearon los coeficientes de Seebeck resueltos por espín a escala atómica utilizando el túnel magneto-Seebeck. Este avance permite que el calor residual alimente un nuevo detector de espín para la espintrónica.

Área de la Ciencia:

Física de la materia condensada
Ciencias de los materiales
La tecnología Spintronics

Sus antecedentes:

El transporte de espín de electrones es crucial para la espintrónica.
El control térmico del transporte de espín es un área de investigación activa.
Las uniones de túneles magnéticos son componentes clave en los dispositivos espintrónicos.

Objetivo del estudio:

Para investigar experimentalmente los detalles a escala atómica del túnel magnético de Seebeck.
Para mapear los coeficientes de Seebeck resueltos por espín con resolución atómica.
Proponer un nuevo detector de espín para aplicaciones de espintrónica.

Principales métodos:

Utilizó una punta de sonda magnética cerca de una muestra magnética en un vacío criogénico.
Aplicamos un gradiente de temperatura a través de la unión del túnel magnético.
Medido el poder térmico mientras se escanea la textura de giro de la muestra.
Mapeo de resolución lateral a escala atómica logrado.

Principales resultados:

Se ha demostrado el túnel magneto-Seebeck a escala atómica.
Se obtienen coeficientes de Seebeck con resolución de espín mapeados con alta resolución espacial.
Mostró la conversión de la información de espín en voltaje a través de gradientes térmicos.

Conclusiones:

El túnel Magneto-Seebeck proporciona información a escala atómica sobre el transporte de electrones polarizados por espín.
Se propone un nuevo detector de espín alimentado por calor residual.
Esta tecnología tiene aplicaciones potenciales en la espintrónica de eficiencia energética.

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