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Static magnetization of polycrystalline nickel spheres (diameter about 0.3 cm) has been studied in detail as a function of the magnetic field above and below the Curie point, T , , using a vibrating sample magnetometer. Above T, the initial magnetic susceptibility is

Magnetic coercivity and squareness of various Fe3O4 particle systems have been investigated as a function of particle size and packing density. It has been found that these particle systems, exhibiting considerable deviations from spherical symmetry, have magnetic coercivities and squareness which are almost independent of packing density.