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Relaxation parameters to simulate the changes in magnetostriction in amorphous magnetic alloys

Authors
Journal
Materials Science and Engineering
0025-5416
Publisher
Elsevier
Publication Date
Volume
97
Identifiers
DOI: 10.1016/0025-5416(88)90101-2
Disciplines
  • Physics

Abstract

Abstract We propose a method for deducing the parameters of the non-linear relaxation distribution model from isothermal measurements. Following this thermodynamic theory, isothermal relaxations can be described as isokinetic processes over a reduced time scale, taking into account non-linear effects, i.e. integrating the sample history. The proposed method leads to the definition of three characteristic parameters of this new time scale. In addition, the model predicts a universal shape of relaxation spectrum for frozen-in fluctuations. Applying this method to magnetostriction changes in VitrovacĀ® 6025 (Co 67Fe 4Mo 1.5Si 16.5B 11), we are able to simulate various thermal histories starting from high temperature equilibrium in the liquid state. We found good agreement with experiments. Free-energy spectra are determined.

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