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Histeresis magnética hasta 80 grados Kelvin en un imán de una sola molécula de disprosio metaloceno
Fu-Sheng Guo1, Benjamin M Day1,2, Yan-Cong Chen3
1Department of Chemistry, School of Life Sciences, University of Sussex, Falmer BN1 9QJ, UK.
Science (New York, N.Y.)
|October 20, 2018
Resumen
Los investigadores desarrollaron un catión metaloceno disprosio que exhibe efectos de memoria magnética por encima de las temperaturas de nitrógeno líquido. Este avance en el almacenamiento magnético basado en moléculas hacia aplicaciones prácticas.
Área de la Ciencia:
- Ciencias de los materiales
- Química
- La física
Sus antecedentes:
- Los imanes de una sola molécula (SMM) son clave para el almacenamiento magnético basado en moléculas.
- Los SMM actuales requieren un frío extremo (helio líquido) para la memoria magnética.
Objetivo del estudio:
- Para diseñar SMM que operan a temperaturas más altas.
- Para superar la limitación de refrigeración de helio líquido para la memoria magnética.
Principales métodos:
- Sintetizó un catión metaloceno de disprosio: [(CpPr5) Dy ((Cp*) ].
- Histeresis magnética medida y barrera de energía para la reversión de la magnetización.
Principales resultados:
- El catión disprosio muestra histeresis magnética por encima de las temperaturas de nitrógeno líquido (80 K).
- Se determinó una barrera de energía efectiva (Ueff) de 1541 cm−1.
- Se ha alcanzado una temperatura de bloqueo (TB) de 80 K.
Conclusiones:
- Este SMM funciona a temperaturas prácticas, superando un obstáculo importante.
- Permite el desarrollo de dispositivos nanomagnéticos para el almacenamiento de información.
- Representa un paso significativo hacia el magnetismo molecular de alta temperatura.
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