The influence of fine structures on the remanence of multidomain particles of magnetite and titanomagnetite

Physics

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Scientific paper

The magnetization of large magnetite particles contains components which resist demagnetizing treatments. The coercive force of the residual magnetization is comparable in size to that for finely divided magnetite irrespective of whether it has survived field or cooling demagnetization. Anhysteretic magnetization (ARM) has been used to examine these properties, even though it is not completely analogous to the geophysically more important thermoremanence, because the chemical composition remains constant at the temperatures employed and also it is possible to perform measurements under conditions where the magnetocrystalline anisotropy effects are small. For titanomagnetites it is also of interest to investigate ARM at lower temperature in order to examine the variations found in the coercive force. The properties of large, immobilized particles at low concentrations have been measured particularly over the temperature range 80-300 K.

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