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Control dinámico del magnetismo por ondas de luz
Florian Siegrist1,2, Julia A Gessner1,2, Marcus Ossiander1
1Max-Planck-Institute of Quantum Optics, Garching, Germany.
Nature
|June 28, 2019
Resumen
Los investigadores demuestran un magnetismo coherente ultrarrápido, que manipula directamente las propiedades magnéticas con la luz
Área de la Ciencia:
- Física de la materia condensada
- La óptica cuántica
- Ciencias de los materiales
Sus antecedentes:
- El electromagnetismo es fundamental, con la electrónica de ondas de luz que controla las propiedades electrónicas.
- Las propiedades magnéticas generalmente se controlan de manera indirecta y lenta, lo que limita las aplicaciones espintrónicas.
- El control directo y ultrarrápido del magnetismo ha sido un desafío de larga data.
Objetivo del estudio:
- Introducir y demostrar el magnetismo coherente ultrarrápido.
- Lograr una manipulación directa de las propiedades magnéticas impulsada por el campo luminoso.
- Establecer las frecuencias ópticas como límite de velocidad para futuros dispositivos espintrónicos.
Principales métodos:
- Desarrolló un esquema de detección de dicroísmos magnéticos circulares con resolución de tiempo de un segundo.
- Utilizado el modelado dinámico cuántico ab initio.
- Estudio de las capas ferromagnéticas sometidas a pulsos láser ultrarrápidos.
Principales resultados:
- Logró la manipulación directa de las propiedades magnéticas por las oscilaciones del campo eléctrico de la luz.
- Reducido el tiempo de respuesta magnética en dos órdenes de magnitud.
- Se observa una transferencia sincronizada de impulso de giro/órbita con una reubicación de carga impulsada por el campo de luz.
Conclusiones:
- Control desvelado del campo de luz coherente de la dinámica de espín y los momentos magnéticos macroscópicos.
- Se ha demostrado el control simultáneo de las propiedades electrónicas y magnéticas para la espintrónica.
- Frecuencias ópticas establecidas como límite máximo de velocidad para aplicaciones espintrónicas coherentes.
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