Magnetic thin films of cobalt nanocrystals encapsulated in graphite-like carbon

Magnetic nanodot arrays produced by direct laser interference lithography

“…Co-C films are chosen in this exploratory study because they form a simple system containing immiscible magnetic ͑Co͒ and nonmagnetic ͑C͒ phases and the metastable Co carbides decompose easily into Co and C upon annealing. [7][8][9][10] Magnetic properties have been studied in laterally homogenous films in both the as-deposited and annealed states. 7,8 One can therefore anticipate that the behavior of laser quenched alloys is similar to that of thermally treated Co-C films.…”

“…[7][8][9][10] Magnetic properties have been studied in laterally homogenous films in both the as-deposited and annealed states. 7,8 One can therefore anticipate that the behavior of laser quenched alloys is similar to that of thermally treated Co-C films. The Co dot arrays are formed by phase separation of Co or Corich clusters under the influence of laser intensity maxima which provide local annealing.…”

“…The pattern formation is attributed to the phase separation or precipitation of Co under local heating at the laser intensity maxima. [7][8][9][10] The as-sputtered Co-C film contains some Corich nanoclusters that are superparamagnetic at room temperature. After laser patterning, there are local atomic rearrangements that form more strongly interacting magnetic Co or Co-rich clusters and yield the observed magnetic phase at room temperature.…”

Magnetization of carbon-coated ferromagnetic nanoclusters determined by electron holography

“…Samples of different composition, structure, and morphology were prepared, their sizes and composition characterized by electron microscopy and spectroscopy, and their integral magnetic properties measured, as a function of temperature. 4,7,11,12 It was confirmed that the encapsulated particles were indeed ferromagnets which makes them interesting from a technological point of view. Although several explanations could be cited for the interpretation of the results, a decision among them was complicated by a lack of information on the magnetic properties of individual particles because only integral magnetic measurements were performed up to now on the samples.…”

Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules

“…On the other hand, the graphite shells are outstanding microwave absorption materials due to their dielectric properties, which play an important role in improving the disperse properties of nanocapsules 9,10 . Actually, Cu nanoparticles possess many good properties such as electric, optical, thermal and lubricating, etc [11][12][13][14][15] . A broad arena in engineering applications is also attributed to these particles and is attracting an increasing number of scientists.Carbon-coated Cu nanocapsules for sensor applications had been produced using a modified flame spray synthesis unit under highly reducing conditions 13 .…”