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Intercambio determinista del ferromagnetismo a temperatura ambiente mediante el uso de un campo eléctrico
1Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.
Nature
|December 19, 2014
Resumen
Los investigadores demostraron el control del magnetismo por el campo eléctrico a temperatura ambiente en BiFeO3. Este avance en multiferroics permite la conmutación determinista del vector Dzyaloshinskii-Moriya, allanando el camino para los dispositivos electrónicos de eficiencia energética.
Área de la Ciencia:
- Física de la materia condensada Física de la materia condensada
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los materiales multiferroicos ofrecen el control del magnetismo a través de campos eléctricos, cruciales para las aplicaciones de dispositivos.
- La ferrita de bismuto (BiFeO3) es el único multiferroico monofásico con acoplamiento magnetoeléctrico a temperatura ambiente.
- Su magnetismo se origina en la interacción Dzyaloshinskii-Moriya (DM), con teorías anteriores que prohibían el cambio directo de polarización del vector DM.
Objetivo del estudio:
- Para investigar la cinética del proceso de conmutación en BiFeO3.3.
- Para demostrar el control determinista del campo eléctrico del vector DM y la magnetización a temperatura ambiente.
- Explorar el potencial de la conmutación magnetoeléctrica energéticamente eficiente en los dispositivos.
Principales métodos:
- Cálculos basados en los primeros principios para analizar la cinética de conmutación.
- Observación experimental de la inversión de la magnetización determinista.
- Demostración del control del dispositivo de válvula de giro utilizando el mecanismo de conmutación observado.
Principales resultados:
- Identificó un proceso de conmutación de dos pasos regido por la cinética, que permite la inversión determinista del vector DM y el momento inclinado.
- Logró una conmutación determinista de 180 grados de la magnetización utilizando un campo eléctrico a temperatura ambiente.
- Se ha demostrado el control energéticamente eficiente de un dispositivo de válvula de giro, que requiere significativamente menos energía que la conmutación de par de transferencia de giro.
Conclusiones:
- La cinética de la conmutación, no solo la simetría del estado fundamental, es clave para comprender y lograr la conmutación magnetoeléctrica determinista en BiFeO3.3.
- Este trabajo proporciona una vía para la ingeniería de conmutación magnetoeléctrica para electrónica de baja energía, no volátil a escala nanométrica.
- Los hallazgos tienen amplias implicaciones para el diseño de futuros dispositivos multiferroicos y magnetoeléctricos.
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