• N G Nanadikar

      Articles written in Pramana – Journal of Physics

    • Inhibition of domain wall formation and its effects on the bulk magnetic properties of certain spinels

      C Radhakrishnamurty N G Nanadikar

      More Details Abstract Fulltext PDF

      It is shown that hysteresis and susceptibility studies at various temperatures could provide an idea whether a magnetic sample contains multidomain, single-domain or superparamagnetic particles. Our results on titanomagnetites with those of others on cobalt substituted magnesium ferrites suggest that domain wall formation is inhibited in some of them whereby only single-domain or superparamagnetic particles occur irrespective of the physical grain size of such materials. At high concentration of titanium in titanomagnetites, the magnetic behaviour is similar to a spin glass, which we interpret as a transition of optimum single-domains going over to superparamagnetic state.

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