Abstract
Dynamics of magnetization relaxation of the MnSb clusters under applied magnetic field has been studied in the 8–300 K temperature range. The lognormal distribution of ferromagnetic MnSb cluster sizes f(D) has been extracted from the field and temperature dependences of magnetic viscosity S(T, H) in GaMnSb thin films. An average cluster diameter D = 55 nm is in agreement with the magnetic force microscopy data. Magnetic anisotropy constant ∼3.2 × 104 erg/cm3 has been determined. The fluctuation field HF = 7 Oe and the activation volume VA = 1.7 × 10−16 cm3 have been calculated from the magnetic viscosity data. Stepped sweeping of the magnetic field expands the windows of experimentally detectable fluctuations. The change in the reversal magnetic field provides the scanning of the MnSb clusters sorting them by fluctuation time (or frequency).
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