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Visualización a escala atómica de las texturas de espín topológico en el imán quiral MnGe
Jacob Repicky1, Po-Kuan Wu1, Tao Liu1,2
1Department of Physics, The Ohio State University, Columbus, OH 43210, USA.
Science (New York, N.Y.)
|December 16, 2021
Resumen
Los investigadores visualizan las texturas de espín topológico en películas delgadas de germanuro de manganeso (MnGe). Estas texturas, incluidos los dominios de franjas helicoidales, se pueden manipular, allanando el camino para el almacenamiento y la computación magnéticos avanzados.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- Nanotecnología
Sus antecedentes:
- Los imanes quirales como el germanuro de manganeso (MnGe) exhiben complejas texturas de espín topológicas.
- Estas texturas de espín son cruciales para la comprensión científica fundamental y las posibles aplicaciones tecnológicas en el almacenamiento magnético y la computación.
Objetivo del estudio:
- Investigar y caracterizar las texturas topológicas del espín en películas delgadas de germanuro de manganeso (MnGe).
- Para correlacionar las texturas de espín observadas con la estructura subyacente a escala atómica.
- Explorar el potencial de manipulación de estas texturas para aplicaciones tecnológicas.
Principales métodos:
- Se utilizó el microscopio de túnel de barrido polarizado por espín (SP-STM) para obtener imágenes de películas delgadas de MnGe.
- Modelado micromagnético empleado para analizar y deducir la orientación tridimensional (3D) de los vectores de onda helicoidales.
- Investigó la manipulación de texturas de espín utilizando pulsaciones de corriente / tensión y campos magnéticos aplicados.
Principales resultados:
- Reveló una variedad de texturas de espín topológicas en películas delgadas de MnGe, incluidos dominios de franjas helicoidales y paredes de dominios heliomagnéticos.
- Se identificaron dos configuraciones distintas para la reunión de tres dominios helicoidales: texturas "similares al objetivo" y "similares a π".
- Se ha demostrado la manipulación reversible de la textura "similar a un objetivo" mediante estímulos eléctricos o magnéticos.
Conclusiones:
- La estructura atómica de las películas delgadas de MnGe dicta las texturas de espín topológicas observadas.
- La textura de giro "similar a un objetivo" exhibe propiedades controlables, lo que es prometedor para futuros dispositivos espintrónicos.
- Este trabajo representa un avance significativo hacia la realización de almacenamiento magnético y tecnologías de computación basadas en imanes quirales.
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