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      https://www.ias.ac.in/article/fulltext/pram/035/04/0377-0381

    • Keywords

       

      Titanomagnetites; magnetic susceptibility; anisotropy constant; isotropic point

    • Abstract

       

      The temperature dependence of magnetic susceptibility,x, of titanomagnetites (Fe3−xTixO4, 0⩽x⩽0.2) at different frequencies in the range of 13 Hz to 117 kHz is reported. Whereas the position of thex-peak of Fe3O4 at 120 K shows no significant shift over this frequency range, that of Fe2.8Ti0.2O4 shifts from 70 K at 13 Hz to 115 K at 117 kHz. This seems to be the first observation of such large shift in the position of ax-peak observed at low-temperatures is attributed to the occurrence of an isotropic point (temperature at which first order anisotropy constantK1=0) associated with change in crystal structure. In such a case a shift inx-peak with frequency is not expected normally. Thus, the observed large shift in the position ofx-peak with frequency is an unusual phenomenon and some of its repercussions are discussed.

    • Author Affiliations

       

      C Radhakrishnamurty1 S D Likhite1 R Nagarajan1

      1. Tata Institute of Fundamental Research, Bombay - 400 005, India
    • Dates

       
  • Pramana – Journal of Physics | News

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