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Transporte de espín de larga distancia ajustable en un óxido de hierro antiferromagnético cristalino
R Lebrun1, A Ross2,3, S A Bender4
1Institute for Physics, Johannes Gutenberg-University Mainz, Mainz, Germany. rolebrun@uni-mainz.de.
Nature
|September 14, 2018
Resumen
Los investigadores demostraron el transporte de corriente de espín a larga distancia en el aislante antiferromagnético hematita. Este avance utiliza el efecto Hall de espín, allanando el camino para dispositivos espintrónicos eficientes y de baja potencia que funcionan sin campos magnéticos externos.
Área de la Ciencia:
- La física
- Ciencias de los materiales
- Ingeniería eléctrica
Sus antecedentes:
- Spintronics tiene como objetivo reemplazar la electrónica convencional con tecnologías basadas en spin para un menor consumo de energía.
- Los materiales antiferromagnéticos ofrecen ventajas para la espintrónica debido a su estabilidad y funcionamiento de alta frecuencia, pero han mostrado distancias de transporte de espín limitadas.
- Estudios anteriores indicaron que la transmisión de espín a través de antiferromagnetos estaba restringida a unos pocos nanómetros.
Objetivo del estudio:
- Para demostrar la propagación de corriente de espín a larga distancia en un aislante antiferromagnético.
- Explorar el potencial de la hematita (α-Fe2O3) para aplicaciones espintrónicas.
- Desarrollar un método para controlar el flujo de corriente de espín en antiferromagnetos.
Principales métodos:
- Utilizó el efecto Hall de espín para la inyección de espín en un solo cristal de hematita.
- Flujo de corriente de giro controlado sintonizando la frecuencia de resonancia antiferromagnética con un campo magnético externo.
- Investigó el transporte de espín a través de una interfaz hematita-platino.
Principales resultados:
- Logró la propagación a larga distancia de las corrientes de espín a través de la hematita a lo largo de decenas de micrómetros.
- Se ha demostrado una eficiencia de transporte de espín comparable a los ferromagnetos complejos.
- Se muestra la transferencia de información de espín paralela al orden antiferromagnético de Néel.
Conclusiones:
- Los aislantes antiferromagnéticos como la hematita pueden soportar un transporte de espín eficiente a larga distancia.
- Esta investigación permite el desarrollo de dispositivos espintrónicos eléctricamente sintonizables, ultrarrápidos y de baja potencia basados en aislantes antiferromagnéticos.
- Los hallazgos sugieren la posibilidad de dispositivos espintrónicos libres de campo magnético que funcionan a temperatura ambiente.
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