Abstract
A zero-field-cooled (ZFC) electron spin resonance (ESR) study of ${\mathrm{Mn}}_{0.5}{\mathrm{Zn}}_{0.5}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ nanoparticle-dispersed magnetic fluid exhibits an isotropic shift in resonance field below 50 K. Below this temperature the field-cooled ESR spectra (textured magnetic fluid) exhibits an angle-dependent hysteresis behavior in resonance field. The hysteresis effect diminishes above 60 K. In both the cases---i.e., ZFC and FC, the linewidth increases rapidly below 50 K. The results has been analyzed in light of random field exchange anisotropy model proposed by Martinez et al. Using this model the surface spin-glass layer thickness has been calculated. The value (3.8 \AA{}) agrees well with that obtained from small-angle neutron scattering experiments (3 \AA{}).
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