Polarización multiferroica inducida dinámicamente
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Updated: Sep 10, 2025
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
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Carolina Paiva1, Michael Fechner2, Dominik M Juraschek1,3
1Tel Aviv University, School of Physics and Astronomy, Tel Aviv 6997801, Israel.
Physical review letters
|August 27, 2025
Resumen
Los científicos ahora pueden crear polarización y magnetización ferroeléctrica en materiales no polares utilizando pulsos láser. Este descubrimiento permite un control ultrarrápido de las propiedades multiferroicas y magnetoeléctricas en nuevos materiales.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- La óptica cuántica
Sus antecedentes:
- La polarización y la magnetización ferroeléctricas se encuentran típicamente en materiales distintos.
- El logro de la multiferroicidad (coexistencia de ferroelectricidad y magnetismo) en materiales no polares y no magnéticos es un desafío significativo.
- El control de estas propiedades en escalas de tiempo ultrarrápidas sigue siendo un área activa de investigación.
Objetivo del estudio:
- Describir un nuevo mecanismo para inducir la polarización ferroeléctrica y la magnetización en materiales no polares y no magnéticos.
- Para demostrar la inducción transitoria de estas propiedades utilizando pulsos láser ultrarrápidos.
- Explorar el control de la polarización multiferroica a través de la quiralidad del pulso láser y los modos de fonón.
Principales métodos:
- Modelado fenomenológico
- Cálculos de los primeros principios
- Excitación láser ultrarrápida de los modos de fonón en el borato de litio gamma (γ-LiBO2)
Principales resultados:
- Se ha demostrado la inducción transitoria de la polarización ferroeléctrica, la magnetización o ambas simultáneamente en γ-LiBO2.
- Se demostró que la polarización y la magnetización inducidas dependen de la polarización (lineal, circular, elíptica) y la quiralidad del pulso láser.
- Se estableció que la dirección y la magnitud de la polarización multiferroica pueden ajustarse mediante la quiralidad del láser y los modos de fonón.
Conclusiones:
- Se ha establecido una nueva vía para crear y controlar la multiferroicidad y la magnetoelectricidad en materiales no polares.
- Los pulsos láser ultrarrápidos ofrecen un método prometedor para el control dinámico de la polarización magnética y eléctrica.
- Este trabajo abre caminos para el desarrollo de nuevos dispositivos multiferroicos con capacidades de conmutación ultrarrápida.
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