In the case of perpendicular media, it is hard to measure the magnetic viscosity S (from the relaxation curve) because the internal field (H{sub}i) is continuously changing with time due to the change in the demagnetizing field. Correction for this effect using an analytical formula [1] falls in principle to provide accurate results in case S varies largely with field. In this paper, we introduce a new method that allows to measure directly the intrinsic viscosity (S{sub}i) using a VSM.
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