Shell-core structures of Fe(C), Co(C) and Fe-Co(C) nanocapsules,
prepared by an arc discharge process in a mixture of methane and
helium, have been demonstrated by means of high-resolution
transmission electron microscopy (HRTEM). These nanoscale magnetic
cores are protected by graphite shells. It has been found that the
zero-field-cooled (ZFC) magnetization of Fe-Co(C) nanocapsules that
display different characteristics in three temperature ranges can be
well interpreted in terms of the unblocking of magnetization of
small single-domain particles and the depinning of large multidomain
particles. The saturation magnetization of these nanocapsules
decreases monotonically, while the coercivity decreases
significantly with increasing temperature.
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