Abstract

Measurements of the transverse susceptibility of particulate media with different strengths of magnetostatic interaction show that the determination of the magnetic anisotropy field strength according to the location of the peak in the transverse susceptibility curve works only in a weakly interacting particle system. On the other hand, the related torsion pendulum method is fully applicable to all particle systems. In strongly interacting particle systems the peak in the measured transverse susceptibility curve, which contains the information about the magnetic anisotropy, vanishes. Furthermore, the susceptibility method detects hysteresis effects in a field range where no hysteresis is expected, which is not understood at present.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

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