(a) TEM image of nickel particles deposited from a toluene dispersion, (b) HRTEM image showing lattice fringes of a single particle, and (c) electron-diffraction pattern from a selected area on the TEM grid.
(Color online) AFM picture of Ni particles drop cast from a pyridine dispersion onto a silicon wafer.
XRD pattern of nickel nanoparticle powder. No phases other than metallic nickel are apparent from the diffractogram.
EDS spectrum of nickel powder.
Magnetization of nickel nanoparticles: (a) low-temperature results showing magnetic hysteresis, (b) higher-temperature results showing superparamagnetic behavior above 200 K, and (c) Langevin function fit of the magnetization curve at 300 K. The normalized plot in (b) shows the expected scaling behavior.
ZFC and FC magnetization curves for nickel nanoparticles. The onset of divergence occurs at indicating spin blocking.
Shifting of the broad maximum in the blocking curve with the applied field magnitude.
The coercive field approximately scales as at low temperatures.
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