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Coercividad gigante y efecto Hall anómalo intrínseco mejorado al desaparecer la magnetización en un ferrimagnet de
Jonathan M DeStefano1, Elliott Rosenberg1, Guodong Ren2
1Department of Physics, University of Washington, Seattle, WA 98112, USA.
Science advances
|August 29, 2025
Resumen
El dopaje de cromo del ferrimagnético kagome logra una compensación magnética, lo que lleva a un efecto Hall anómalo gigante y una alta coercitividad. Esto aumenta el potencial para dispositivos espintrónicos avanzados.
Área de la Ciencia:
- Física de la materia condensada
- Ciencias de los materiales
- La tecnología Spintronics
Sus antecedentes:
- Los ferrimagnetos cerca de la compensación magnética ofrecen propiedades espintrónicas únicas, incluido un efecto Hall anómalo significativo (AHE) sin un gran momento magnético.
- Un AHE grande y una alta coercitividad son deseables para los dispositivos espintrónicos, lo que permite funciones fáciles de leer y difíciles de borrar.
Objetivo del estudio:
- Para investigar los efectos del dopaje de cromo (Cr) en el kagome ferrimagnet TbMn_{6}$Sn_{6}$.
- Explorar el potencial para lograr la compensación magnética y mejorar el efecto Hall anómalo a través del dopaje químico.
Principales métodos:
- El dopaje químico de los sitios de manganeso (Mn) en TbMn6 con cromo (Cr).
- Caracterización magnética a bajas temperaturas para observar campos coercitivos.
- Análisis del efecto Hall anómalo en relación con los desplazamientos de nivel de Fermi.
Principales resultados:
- El Cr doping impulsa el sistema TbMn hacia la compensación magnética.
- Se observaron campos coercitivos gigantes de más de 14 T en composiciones casi compensadas a bajas temperaturas.
- El dopaje de Cr aumenta significativamente el efecto Hall anómalo intrínseco, vinculado a las modificaciones del nivel de Fermi.
Conclusiones:
- El dopaje químico es una estrategia efectiva para ajustar los estados magnéticos en los materiales kagome.
- TbMn_{6}$Sn_{6}$ dopado con cromo exhibe una AHE mejorada y una alta coercitividad, lo que lo convierte en un candidato prometedor para aplicaciones espintrónicas.
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