We review the current status of the use of focused electron beam induced deposition (FEBID) for the growth of magnetic nanostructures. This technique relies on the local dissociation of a precursor gas by means of an electron beam. The most promising results have been obtained using the Co 2 (CO) 8 precursor, where the Co content in the grown nanodeposited material can be tailored up to more than 95%. Functional behaviour of these Co nanodeposits has been observed in applications such as arrays of magnetic dots for information storage and catalytic growth, magnetic tips for scanning probe microscopes, nano-Hall sensors for bead detection, nano-actuated magnetomechanical systems and nanowires for domain-wall manipulation. The review also covers interesting results observed in Fe-based and alloyed nanodeposits. Advantages and disadvantages of FEBID for the growth of magnetic nanostructures are discussed in the article as well as possible future directions in this field.

Large-scale production of graphene and reduced-graphene oxide (rGO) requires low-cost and ecofriendly synthesis methods. We employed a new, simple, cost-effective pyrolytic method to synthetize oxidized-graphenic nanoplatelets (OGNP) using bamboo pyroligneous acid (BPA) as source. Thorough analyses via high-resolution transmission electron microscopy and electron energy-loss spectroscopy provides a complete structural and chemical description at the local scale of these samples. In particular, we found that at the highest carbonization temperature the OGNP-BPA are mainly in sp 2 bonding configuration (sp 2 fraction of 87%). To determine the electrical properties of single nanoplatelets, these were contacted by Pt nanowires deposited through focused-ion-beam-induced deposition techniques.Increased conductivity by two orders of magnitude is observed as oxygen content decreases from 17 to 5%, reaching a value of 2.3x10 3 S/m at the lowest oxygen content. Temperature-dependent conductivity reveals a semiconductor transport behavior, described by the Mott three-dimensional variable range hopping mechanism. From the localization length, we estimate a band-gap value of 0.2(2) eV for an oxygen content of 5%. This investigation demonstrates the great potential of the OGNP-BPA for technological applications, given that their structural and electrical behavior is similar to the highlyreduced rGO sheets obtained by more sophisticated conventional synthesis methods.

We report Hall-effect measurements of epitaxial Fe ͑001͒ thin films grown on MgO ͑001͒. We have focused on the dependence of the anomalous Hall effect ͑AHE͒ in heteroepitaxial structures MgO ͑001͒ / /Fe͑t͒ / MgO with t = 10, 2.5, 2, 1.8, and 1.3 nm. Our results have been interpreted in terms of a recent unified theory of the AHE. We have demonstrated that the thickness and roughness of the Fe layer are control parameters to tune both the longitudinal conductivity xx and anomalous Hall conductivity xy . In this way, we report a crossover from the intrinsic moderately dirty region of conductivities where xy = const to the dirty region of poorly conducting materials ͑ xx Ͻ 10 4 S / cm͒ where we have found that the relation xy ϰ xx n with n = 1.66͑4͒ holds, in good agreement, with the expected universal scaling relationship reported in other ferromagnetic compounds.