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We report on the synthesis of ferromagnetic cobalt nanocubes of various sizesusing thermal pyrolysis method and the effect of shape anisotropy on the staticand dynamic magnetic properties were studied. Shape anisotropy of approximately10 % was introduced in nanocubes by making nanodiscs using a linear chain aminesurfactant during synthesis process. It has been observed that, ferromagnetismpersisted above room temperature and a sharp drop in magnetic moment at lowtemperatures in zero-field cooled magnetization may be associated with the spindisorder due to the effective anisotropy present in the system. Dynamicmagnetic properties were studied using RF transverse susceptibilitymeasurements at different temperatures and the singularities due to anisotropyfields were probed at low temperatures. Symmetrically located broad peaks areobserved in the frozen state at the effective anisotropy fields and the peakstructure is strongly affected by shape anisotropy and temperature.Irrespective of size the shape anisotropy gave rise to higher coercive fieldsand larger transverse susceptibility ratio at all temperatures. The role ofshape anisotropy and the size of the particles on the observed magneticbehaviour were discussed.

Effect of induced shape anisotropy on magnetic properties of ferromagnetic cobalt nanocubes