Nanostructured magnetic metamaterials based on metal-filled carbon nanotubes. (January 2016)

• Record Type: Journal Article
• Authors: Rossella, F.; Mozzati, M.C.; Bordonali, L.; Lascialfari, A.; Soldano, C.; Ortolani, L.; Bellani, V.
• Is Part Of: Carbon. Volume 96(2016)
• Page Start: 720
• Page End: 728
• Publication Date: 2016-01
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2015.09.094
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Hybrid systems formed by carbon nanotubes filled with metal represent a class of nanomaterials with manifold functionality that can find applications in different fields as, for example, magnetic storage and spintronics. Here a detailed and comprehensive study is reported on the magnetic properties of template grown cobalt cluster-filled multiwall carbon nanotube arrays. The temperature and magnetic field dependence of the samples magnetization are investigated in the range 5–760 K and from −50 kOe to +50 kOe, respectively. Hysteresis cycles are slightly open and transmission electron microscopy reveals that the cobalt clusters inside the nanotubes exhibit a crystalline nature. The zero-field cooling/field-cooling magnetization temperature dependence, analyzed in the framework of a "two-state" progressive crossover model, reveals spin disorder and suggests a spin glass-like scenario. These findings show that cobalt-filled nanotube arrays represent a unique system of magnetically coupled nanostructures, allowing to envision a new class of nanoscale carbon-based magnetic metamaterials, ideal platforms for novel magneto-electronic devices.