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Construir octaedros asimétricos con centro de Ni en estructuras orgánicas metálicas en capas para magnetoelectricidad
Kaihui Mao1, Jinlei Zhang1,2, Zijing Guo1
1National Laboratory of Solid State Microstructures and Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Nanjing University, Nanjing 210093, P. R. China.
Journal of the American Chemical Society
|July 1, 2020
Resumen
Los investigadores desarrollaron una nueva estructura metálico-orgánica en capas (LMOS) que exhibe propiedades multiferroicas magnetoeléctricas a temperatura ambiente. Este avance ofrece potencial para dispositivos nanoelectrónicos avanzados al permitir el control de los dominios magnéticos con campos eléctricos.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia condensada
- Nanotecnología
Sus antecedentes:
- Las estructuras metálicas orgánicas en capas (LMOS) son cruciales para el desarrollo de multiferroicos magnetoeléctricos (ME) en nanoelectrónica.
- Los desafíos para alcanzar la temperatura ambiente, los multiferroicos de EM de una sola fase incluyen bajas temperaturas de transición, mala polarización y un acoplamiento de EM débil.
Objetivo del estudio:
- Para construir un nuevo LMOS con cerca de la temperatura ambiente ferroelectricidad y ferromagnetismo.
- Investigar los efectos de acoplamiento magnetoeléctrico y las capacidades de manipulación de dominio del nuevo LMOS.
Principales métodos:
- Síntesis de una estructura metálico-orgánica en capas utilizando difenilalanina y Ni (II).
- Caracterización de las propiedades ferroeléctricas y ferromagnéticas cerca de la temperatura ambiente (283 K).
- Medición de la respuesta de polarización magnetoeléctrica a campos magnéticos variables (02 T) a 251 K.
Principales resultados:
- Ferroelectricidad e histerismo espontáneos observados cerca de la temperatura ambiente.
- Se demostró una fuerte polarización ME dependiente del campo magnético, con un control alcanzable en campos magnéticos bajos.
- Manipulación del campo eléctrico de los dominios magnéticos confirmados a 283 K.
- Distorsión octaédrica asimétrica identificada como clave para una mayor polarización y efecto EM.
Conclusiones:
- El LMOS desarrollado representa un avance significativo hacia los multiferroicos orgánicos monofásicos a temperatura ambiente.
- El mecanismo de distorsión asimétrica proporciona una vía para el diseño de futuros materiales multiferroicos con propiedades mejoradas.
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