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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Medición de la carga y la corriente de los monopolos magnéticos en hielo de espín
S T Bramwell1, S R Giblin, S Calder
1London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, 17-19 Gordon Street, London WC1H 0AH, UK. s.t.bramwell@ucl.ac.uk
Nature
|October 16, 2009
Resumen
Los investigadores midieron experimentalmente las cargas y corrientes magnéticas, llamadas corrientes magnéticas.
Área de la Ciencia:
- Física de la materia condensada Física de la materia condensada
- El magnetismo es el magnetismo.
- Los fenómenos emergentes son fenómenos emergentes.
Sus antecedentes:
- El transporte de carga eléctrica es fundamental para la tecnología y la biología.
- El transporte de carga magnética se entiende mal debido a la falta de cuasipartículas magnéticas bien definidas.
- Las cargas magnéticas emergentes, análogas a los monopolos magnéticos, se han propuesto teóricamente en materiales específicos.
Objetivo del estudio:
- Para medir experimentalmente las cargas magnéticas y su dinámica ("magneticidad") directamente.
- Desarrollar un método independiente del material para la detección de cargas magnéticas.
- Para investigar las propiedades de las cargas magnéticas en los materiales de "hielo de espín".
Principales métodos:
- Adaptó la teoría de los electrolitos de Onsager para la medición de la carga magnética.
- Utilizó la espectroscopia de rotación de espín de muones como una sonda local.
- Se aplicó el método desarrollado a Dy(2)Ti(2)O(7) hielo de espín.
Principales resultados:
- Se ha confirmado la existencia de cargas magnéticas en Dy(2)Ti(2)O(7).
- Demostró que las cargas magnéticas interactúan a través de un potencial de Coulomb y exhiben corrientes medibles.
- Caracterizó las desviaciones de la ley de Ohm y determinó la unidad de carga magnética elemental.
- Estableció una simetría cuantitativa entre la electricidad y el magnetismo.
Conclusiones:
- Las cargas y corrientes magnéticas ("magneticidad") son fenómenos verificables experimentalmente.
- El método desarrollado proporciona una vía para el estudio de fenómenos magnéticos emergentes.
- Este trabajo revela una simetría fundamental entre el transporte de cargas eléctricas y magnéticas.
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