LAUSR

We report the structure and magnetotransport properties of buckypaper films comprising multiwall carbon nanotubes with a Bernal-like concentric shell structure and mixed Russian doll and jellyroll structure filled along the capillary core with micrometer-long ferromagnetic Fe-based nanowires. Our results show a not previously reported dependence of the magnetoconductance (MC) on the concentration of carbon nanotube (CNT) defects, which can be tuned experimentally by modifying the quantity of dichlorobenzene precursor and interpreted by a weak localization mechanism. Surprisingly, no MC contribution arising from the encapsulated ferromagnetic nanocrystals could be probed, despite the high filling ratio (above 39%) of the CNTs. Such an unusual result suggests that the presence of highly resistive Fe/C interfacial regions prevents the interaction between transport electrons and encapsulated ferromagnetic crystals. Our results may have important implications in electronics and data storage systems where separate engineering of conductance by defects and ferromagnetism by filled crystals could result in multifunctional applications.We report the structure and magnetotransport properties of buckypaper films comprising multiwall carbon nanotubes with a Bernal-like concentric shell structure and mixed Russian doll and jellyroll structure filled along the capillary core with micrometer-long ferromagnetic Fe-based nanowires. Our results show a not previously reported dependence of the magnetoconductance (MC) on the concentration of carbon nanotube (CNT) defects, which can be tuned experimentally by modifying the quantity of dichlorobenzene precursor and interpreted by a weak localization mechanism. Surprisingly, no MC contribution arising from the encapsulated ferromagnetic nanocrystals could be probed, despite the high filling ratio (above 39%) of the CNTs. Such an unusual result suggests that the presence of highly resistive Fe/C interfacial regions prevents the interaction between transport electrons and encapsulated ferromagnetic crystals. Our results may have important implications in electronics and data storage systems where separ...