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Bias de intercambio intrínseco cercano a la temperatura ambiente en un vidrio de espín ZrSe intercalado

Zhizhi Kong¹, Corey J Kaminsky², Catherine K Groschner¹

¹Department of Chemistry, University of California, Berkeley, California 94720, United States.

Journal of the American Chemical Society

|August 30, 2023

Resumen

Descubrimos que el trastorno magnético y la frustración de giro en Fe intercalado ZrSe2 crean un efecto de sesgo de intercambio robusto. Este hallazgo ofrece nuevas estrategias para diseñar dispositivos espintrónicos avanzados.

Área de la Ciencia:

Física de la materia condensada
Ciencias de los materiales
La tecnología Spintronics

Sus antecedentes:

El sesgo de intercambio, un cambio en los bucles de histeresis magnética, es crucial para los dispositivos espintrónicos, pero carece de una comprensión mecánica completa.
La frustración de giro inducida por el trastorno es un factor clave propuesto recientemente que influye en el sesgo de intercambio.
El desarrollo de nuevos materiales para la espintrónica requiere entender cómo aprovechar este efecto.

Objetivo del estudio:

Diseñar e investigar un vidrio de espín que exhiba una fuerte frustración de espín.
Explorar el papel del desorden magnético en el logro del sesgo de intercambio.
Evaluar el potencial de los dicalcogenuros de metales de transición intercalados (TMD) para aplicaciones espintrónicas.

Principales métodos:

Cristales simples de Fe intercalados ZrSe2 con un desorden magnético introducido intencionalmente.
Se utilizó el análisis estructural para confirmar la ocupación de Fe (II) de los sitios intersticiales y la falta de orden de largo alcance.
Realizó mediciones magnéticas para caracterizar el estado básico frustrado y el comportamiento de sesgo de intercambio.

Principales resultados:

Se observó un estado de base magnéticamente frustrado y multidegenerado en cristales simples Fe0.17ZrSe2, que persiste por encima de la temperatura ambiente.
Demostró un efecto de sesgo de intercambio robusto y ajustable hasta 250 K, impulsado por la frustración magnética.
Se confirmó que el sesgo de intercambio significativo puede surgir de la inhomogeneidad microscópica sin orden magnético de largo alcance.

Conclusiones:

El desorden magnético y la frustración son clave para lograr un sesgo de intercambio robusto, ofreciendo una nueva estrategia de diseño de materiales.
El ZrSe2 intercalado con Fe presenta propiedades prometedoras para las tecnologías espintrónicas, lo que potencialmente permite aplicaciones a temperatura ambiente.
Este trabajo proporciona información fundamental sobre el desorden magnético y la frustración en los materiales magnéticos.

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