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Comportamiento multiferroico inducido por la ordenación magnética en el marco metálico-orgánico [CH3NH3] [Co(HCOO) 3
L Claudia Gómez-Aguirre1, Breogán Pato-Doldán1, J Mira2
1Department of Fundamental Chemistry, Faculty of Sciences, University of A Coruña , 15071 A Coruña, Spain.
Journal of the American Chemical Society
|December 31, 2015
Resumen
Descubrimos el comportamiento multiferroico en un imán de estructura orgánica metálica. Este antiferromagnet inclinado exhibe propiedades magnéticas y eléctricas acopladas, mostrando efectos de memoria bajo campos magnéticos.
Área de la Ciencia:
- Ciencias de los materiales
- Física del estado sólido
- Química
Sus antecedentes:
- Las estructuras metal-orgánicas (MOF) ofrecen estructuras ajustables para propiedades novedosas.
- Los materiales multiferroicos exhiben un ordenamiento magnético y eléctrico acoplado.
- La investigación de las MOF para el comportamiento multiferroico es un área de investigación emergente.
Objetivo del estudio:
- Para reportar la primera instancia de comportamiento multiferroico inducido por ordenamiento magnético en un MOF.
- Caracterizar las propiedades magnéticas y eléctricas de [CH3NH3][Co(HCOO) 3).
- Para aclarar el mecanismo detrás del acoplamiento multiferroico observado.
Principales métodos:
- Síntesis y análisis estructural del compuesto [CH3NH3][Co(HCOO) ].
- Mediciones de la susceptibilidad magnética y de la magnetización.
- Mediciones de polarización eléctrica bajo campos magnéticos aplicados.
Principales resultados:
- El compuesto [CH3NH3] [Co(HCOO) 3 exhibe un comportamiento multiferroico por debajo de 15,9 K.
- El ordenamiento magnético es un antiferromagnético de espín con un componente ferromagnético débil debido a las interacciones Dzyaloshinskii-Moriya (DM).
- Comutación magnética y eléctrica acoplada observada a lo largo de direcciones cristalográficas específicas, con un efecto de memoria de polarización eléctrica inusual.
Conclusiones:
- El marco metálico-orgánico [CH3NH3] [Co(HCOO) ] es un nuevo material multiferroico.
- El comportamiento multiferroico observado se atribuye a un mecanismo de DM inverso.
- Los hallazgos abren nuevas vías para aplicaciones multiferroicas basadas en MOF.
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