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(a) TEM image of the nanoparticles. (b) HRTEM image of four particles with a central carbon coated Cu grid.
(a) Temperature dependent ZFC and FC magnetizations under . The inset shows an enlarged view of the ZFC peaks under , 0.05, and 0.1 T. (b) Cooling field dependent (open circle) and (open square) at 200 K. Inset shows vs plot at 5 K. (c) vs plot under (closed circles) and vs plot under (crosses). The solid lines are a guide for the eye.
(a) Field dependent TRM and IRM. The TRM data at 5 K are fitted (solid line) using the power law, , while the dotted line joining the IRM data is a guide for the eye. [(b) and (c)] Schematic diagrams to explain the sign reversal of magnetization and . The darker and lighter parts represent the shell and core of the nanoparticles, respectively. Presence of and (from the core) at the interface is shown in (b) and (c), respectively.
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