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Antiferromagnetos sintéticos a base de todos los óxidos que exhiben una inversión de la magnetización en capas
Binbin Chen1,2, Haoran Xu1, Chao Ma1
1Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China.
Science (New York, N.Y.)
|July 15, 2017
Resumen
Los investigadores diseñaron el acoplamiento de intercambio antiferromagnético (AF-IEC) en capas de óxido ferromagnético ultrafinas. Este avance permite la conmutación magnética controlada en nuevas interfaces de óxido para dispositivos electrónicos avanzados.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia condensada
- Electrónica de óxido
Sus antecedentes:
- La síntesis de antiferromagnetos con óxidos correlacionados es difícil debido al ferromagnetismo degradado en capas magnéticas a nanoescala.
- Lograr un acoplamiento magnético controlado en las interfaces de óxido es crucial para los dispositivos electrónicos de próxima generación.
Objetivo del estudio:
- Diseñar el acoplamiento de intercambio antiferromagnético (AF-IEC) entre capas de óxido ferromagnético ultrafinas.
- Para demostrar la conmutación magnética en capas y los bucles de histeresis controlables.
- Explorar el uso de materiales magnéticos alternativos con temperaturas de Curie más altas.
Principales métodos:
- Fabricación de heteroestructuras con capas ultradelgadas de La2/3Ca1/3MnO3 separadas por un aislante de CaRu1/2Ti1/2O3.
- Investigación de las propiedades magnéticas mediante mediciones de conmutación magnética con resolución en capas.
- Caracterización de los bucles de histeresis y las mesetas de magnetización.
Principales resultados:
- Ingeniería exitosa de AF-IEC entre capas ultradelgadas de La2/3Ca1/3MnO3.
- Observación de bucles de histeresis agudos y escalonados con mesetas de magnetización dependientes de la repetición en dos capas.
- Demostración de la conmutación magnética en campos moderados (cientos de oersted).
- Realización de AF-IEC utilizando La2 / 3Sr1 / 3MnO3, un material con una temperatura de Curie cercana a la temperatura ambiente.
Conclusiones:
- El AF-IEC diseñado proporciona una vía para controlar el magnetismo en las heteroestructuras de óxido.
- Los circuitos de conmutación magnética y histeresis agudos observados ofrecen nuevas funcionalidades para dispositivos basados en óxidos.
- Este trabajo amplía las posibilidades de utilización de óxidos correlacionados en aplicaciones electrónicas avanzadas.
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