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Resonancia inducida por corriente y determinación de la masa de una sola pared de dominio magnético
Eiji Saitoh1, Hideki Miyajima, Takehiro Yamaoka
1Department of Physics, Keio University, Yokohama, 223-8522, Japan. eizi@phys.keio.ac.jp
Nature
|November 13, 2004
Resumen
Los investigadores midieron la masa de las paredes del dominio magnético (DW), que se comportan como partículas. Este hallazgo es crucial para desarrollar memorias magnéticas más rápidas y de alta densidad utilizando corrientes eléctricas.
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:
- Las paredes de dominio magnético (DW) son defectos topológicos en los imanes.
- Se predice que los DW se comportarán como partículas masivas, que interactúan con las corrientes eléctricas.
- Comprender la masa DW es clave para las aplicaciones de memoria magnética de alta densidad.
Objetivo del estudio:
- Para determinar experimentalmente la masa de una pared de dominio magnético.
- Para investigar la dinámica y la manipulación de DWs en nanocables ferromagnéticos.
Principales métodos:
- Preparado un potencial sintonizable para un solo DW en un nanocable ferromagnético.
- Movimiento de resonancia detectado del DW inducido por una corriente oscilante.
Principales resultados:
- Dinámica de DW observada directamente, revelando una masa finita de 6.6 x 10 ^ 23 kg.
- Se logra una operación de baja corriente con un desplazamiento DW de 10 micrómetros a una densidad de corriente de 10^10 A m^-2.
Conclusiones:
- La determinación experimental de la masa DW proporciona datos críticos para la velocidad del dispositivo.
- Manipulación demostrada de baja corriente de DWs, crucial para las aplicaciones prácticas de memoria magnética.
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