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Criterion of the Relative Length of the Disperse Magnet when Determining its Potential Magnetic Properties

Both types of magnets – homogeneous (solid) and inhomogeneous, particular dispersed, as backfills of ferromagnetic granules – are useful in various electromagnetic systems. Attention is drawn to the physically substantiated interconnections of the key magnetic parameters of "short" (having a demagnetizing factor) samples of magnets, such as magnetic induction, permeability, susceptibility, magnetization. It is noted that for calculating the susceptibility and magnetization of such samples, in addition to the data of their magnetic permeability required here, the data of the magnetic permeability of the sample material (obtained, for example, when studying the same in composition, but "long", sample) are mandatory. Using the corresponding calculated expressions, the data of these parameters are analyzed for dispersed samples (polyspherical, similar to quasisolid materials) in a magnetizing field with an intensity of up to 163 kA/m at different ratios of the length of the cylindrical sample to its diameter. It is shown that these samples become already sufficiently "long" when length to diameter is more than 10-12, while there are no signs of their magnetic saturation (including "long" samples). Dependences of the demagnetizing factor of such "short" samples on length to diameter are given for different intensity and corresponding values of the magnetic permeability of their quasisolid material – with the approximation of these dependences by functions of exponential form.