Influence of the demagnetizing factor on the magnetization of an ensemble of Stoner-Wohlfarth particles |
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Authors: | V M Kalita A A Timopheev S M Ryabchenko |
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Institution: | 1.Institute of Physics,National Academy of Sciences of Ukraine,Kiev,Ukraine |
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Abstract: | The influence of the demagnetizing factor on the coercivity of a sample of oriented uniaxial Stoner-Wohlfarth particles is
investigated in the approximation of a relaxation model with a self-consistent determination of the demagnetization field.
The demagnetizing field is shown to change the particle magnetization reversal conditions and to reduce the blocking temperature
and coercivity, for which, despite allowance for the demagnetizing field, the Neel-Brown relation holds. It is also shown
that under the demagnetizing field, the internal magnetic field in which the particles are located is not stationary but varies
with time concordantly with the time sweep of the temperature during magnetization in a constant external field after zero-field
cooling (ZFC). Nonstationarity of the internal field in the ZFC regime causes the interval of transition temperatures of the
ensemble particles from a blocked state to a state with equilibrium magnetization to increase. |
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Keywords: | |
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