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Colossal acoplamiento magnetoeléctrico a temperatura ambiente en películas de perovskita en capas con deficiencia de
Hongwei Wang1,2, Xiangfei Li3, Jun Miao1,2
1Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
Journal of the American Chemical Society
|July 3, 2025
Resumen
Los investigadores descubrieron un acoplamiento magnetoeléctrico colosal y una alta polarización ferroeléctrica en una nueva película de óxido de plomo y hierro. Este avance en los materiales de óxido en capas ofrece una nueva estrategia para aplicaciones multiferroicas a temperatura ambiente.
Área de la Ciencia:
- Ciencias de los materiales
- Física del estado sólido
- Física de la materia condensada
Sus antecedentes:
- Las perovskitas en capas deficientes en aniones como Pb2Fe2O5 son materiales multiferroicos potenciales debido a sus propiedades únicas de Pb y Fe.
- La exploración de las propiedades multiferroicas y el acoplamiento magnetoeléctrico en Pb2Fe2O5 está limitada debido a su estructura compleja.
Objetivo del estudio:
- Investigar las propiedades multiferroicas y el acoplamiento magnetoeléctrico en una película epitaxial Pb2Fe2O5.
- Explorar el efecto de la introducción excesiva de iones Pb en la estructura y las propiedades ferroeléctricas del material.
Principales métodos:
- Deposición epitaxial de película delgada de Pb2+0,48Fe2O5.
- Caracterización de las propiedades multiferroicas, incluido el coeficiente de acoplamiento magnetoeléctrico, la polarización ferroeléctrica y el momento magnético a temperatura ambiente.
Principales resultados:
- Se logró un colosal coeficiente de acoplamiento magnetoeléctrico de 5.19 × 10^5 mV cm^-1 Oe^-1.
- Se observa una alta polarización ferroeléctrica (2 μC/cm2) y un momento magnético (25 emu/cc) a temperatura ambiente.
- Demostró que el exceso de iones Pb mejora las propiedades ferroeléctricas al ordenar la estructura de la capa mixta.
Conclusiones:
- La película epitaxial Pb2+0,48Fe2O5 exhibe propiedades multiferroicas significativas a temperatura ambiente.
- El exceso de incorporación de iones Pb es una estrategia viable para mejorar el acoplamiento ferroeléctrico y magnetoeléctrico en óxidos en capas.
- Este estudio enriquece el panorama de los materiales de acoplamiento magnetoeléctrico y ofrece vías para aplicaciones avanzadas de dispositivos multiferroicos.
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