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Firmas de control del magnetismo por el flujo del momento angular
L Chen1, Y Sun2, S Mankovsky3
1Department of Physics, Technical University of Munich, Munich, Germany. lin0.chen@tum.de.
Nature
|September 4, 2024
Resumen
La aplicación de una corriente eléctrica en las capas de platino puede alterar las propiedades magnéticas de las películas de hierro adyacentes. Este descubrimiento ofrece nuevas posibilidades para desarrollar dispositivos espintrónicos avanzados.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- La tecnología Spintronics
Sus antecedentes:
- El control eléctrico de los materiales magnéticos es crucial para el magnetismo y las aplicaciones fundamentales.
- Los métodos existentes a menudo implican voltajes de puerta para modular poblaciones de portadoras.
- Se necesitan nuevas estrategias para la manipulación eléctrica de los parámetros de orden magnético.
Objetivo del estudio:
- Investigar el efecto de la corriente de carga en el plano sobre las propiedades magnéticas de las películas de Fe en múltiples capas de Pt/Al/Fe/GaAs.
- Para entender el mecanismo detrás de las modificaciones magnéticas inducidas por la corriente.
- Para explorar aplicaciones potenciales en dispositivos espintrónicos.
Principales métodos:
- Fabricación de capas múltiples de Pt/Al/Fe/GaAs.
- Aplicación de la corriente de carga en el plano en las capas Pt.
- Mediciones de resonancia ferromagnética en frecuencias de microondas variables.
- Análisis de los cambios inducidos por la corriente en la anisotropía magnetocristalina.
Principales resultados:
- Una corriente de carga en el plano en Pt desplaza el campo de resonancia ferromagnética en películas finas de Fe.
- Este cambio se atribuye a una modificación inducida por la corriente de la anisotropía magnetocristalina (ΔHA) del Fe.
- ΔHA depende del grosor de la película de Fe, la polaridad de la corriente y la dirección de magnetización, consistente con los efectos de acumulación de espín / órbita.
- La corriente de espín de Pt juega un papel dominante en la modificación de las propiedades magnéticas.
Conclusiones:
- La corriente eléctrica puede ajustar efectivamente la anisotropía magnética de las películas de hierro.
- El fenómeno observado está relacionado con la generación de corriente de espín y su interacción con las capas magnéticas.
- Esto proporciona una nueva vía para desarrollar dispositivos espintrónicos avanzados con control eléctrico sobre el magnetismo.
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