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Imágenes de la histeresis térmica de las nanopartículas de espín único

Shasha Liu¹, Kai Zhou¹, Tinglian Yuan¹

¹State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.

Journal of the American Chemical Society

|August 27, 2020

Resumen

Las nanopartículas de espín cruzado único (SCO) exhiben histeresis magnética intrínseca, superando las limitaciones de las mediciones a granel. La microscopia de resonancia plasmónica de superficie revela propiedades estables y dependientes del tamaño que son cruciales para los dispositivos avanzados.

Área de la Ciencia:

Ciencias de los materiales
Nanotecnología
Química Física

Sus antecedentes:

Los materiales de espín cruzado (SCO) poseen histeresis magnética, prometedora para dispositivos electrónicos y ópticos.
Las mediciones masivas oscurecen las propiedades individuales de las nanopartículas debido a la heterogeneidad e interacciones.
Comprender el comportamiento de una sola partícula es clave para optimizar el rendimiento del material SCO.

Objetivo del estudio:

Para medir la histeresis térmica intrínseca de las nanopartículas individuales de SCO.
Investigar la influencia del tamaño y la morfología en las propiedades de las nanopartículas SCO.
Evaluar la estabilidad y la ciclabilidad de las nanopartículas individuales de SCO.

Principales métodos:

Se utilizó microscopía de resonancia de plasma de superficie (SPRM) para una lectura óptica no intrusiva y de alto rendimiento.
Las curvas de histeresis térmica medidas de las nanopartículas individuales de SCO.
Histeresis correlacionada con el tamaño y la morfología de las nanopartículas.

Principales resultados:

El SPRM rastreó cuantitativamente las transiciones de espín inducidas por calor a través de cambios de contraste óptico.
Las mediciones de nanopartículas individuales mostraron temperaturas de transición intrínsecas independientes de la velocidad de escaneo.
Se ha demostrado una estabilidad superior durante 11.000 ciclos para las nanopartículas individuales de SCO.
Reveló una heterogeneidad significativa de nanopartícula a nanopartícula en las propiedades de histeresis.

Conclusiones:

El análisis de una sola partícula con SPRM supera las limitaciones de medición a granel para los materiales SCO.
El tamaño y la morfología de las nanopartículas tienen un impacto significativo en la histeresis, lo que permite un diseño racional.
Las nanopartículas SCO ofrecen una histeresis intrínseca estable para aplicaciones avanzadas en electrónica de espín y almacenamiento de datos.

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