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Conmutación de la magnetización por torsión mediada por magnon a través de un aislante antiferromagnético
Yi Wang1,2, Dapeng Zhu1, Yumeng Yang1
1Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
Science (New York, N.Y.)
|November 30, 2019
Resumen
Los investigadores demostraron la conmutación de magnetización de eficiencia energética utilizando corrientes de magnon, ofreciendo una alternativa prometedora al par de transferencia de espín basado en electrones para dispositivos espintrónicos.
Área de la Ciencia:
- La tecnología Spintronics
- Física de la materia condensada
- Ciencias de los materiales
Sus antecedentes:
- La manipulación eficiente de la magnetización local es crucial para los dispositivos magnéticos.
- El par de transferencia de giro eléctrico (STT) es un método común, pero sufre una gran disipación de energía debido al calentamiento de Joule.
- El desarrollo de alternativas energéticamente eficientes para el control de la magnetización es un área activa de investigación.
Objetivo del estudio:
- Para demostrar experimentalmente un enfoque alternativo para la conmutación de magnetización utilizando corrientes de magnon.
- Investigar la viabilidad de la conmutación de la magnetización inducida por magnon-torque a temperatura ambiente.
- Evaluar la eficiencia de las corrientes de magnon en la transferencia del momento angular de giro.
Principales métodos:
- Fabricación de estructuras heterogéneas de NiO y Bi2Se3/antiferromagnético aislante.
- Utilizando las corrientes de magnon para inducir la transferencia de espín.
- Demostración experimental de la conmutación de la magnetización a través del par de magnon.
Principales resultados:
- Se ha logrado la conmutación de magnetización inducida por magnon-torque en dispositivos de Bi2Se3/NiO/ferromagnet a temperatura ambiente.
- Las corrientes de Magnon transportan eficientemente el momento angular de espín a través de una capa de NiO de 25 nm sin la participación de electrones.
- La eficiencia del par Magnon fue comparable a las relaciones de par eléctrico de giro informadas anteriormente.
Conclusiones:
- Las corrientes de Magnon ofrecen un mecanismo energéticamente eficiente para controlar la magnetización, superando las limitaciones de la STT eléctrica.
- Esta investigación allana el camino para el desarrollo de dispositivos avanzados de memoria y lógica espintrónica de baja disipación.
- Los hallazgos dinamizan el campo de la espintrónica basada en magnon y las aplicaciones de dispositivos.
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