Abstract
The magnetic properties of a (CoFe2O4)20Ag80 nanocomposite packed into a cylindrical sample holder were investigated. The nanoparticle system becomes superferromagnetic (SFM) below 223 K. The SFM state was investigated by measuring the temperature dependence of the zero-field-cooled (ZFC) and field-cooled (FC) magnetizations and by recording hysteresis loops. For magnetic field ( $H$ ) applied along the axis of the sample holder, the ZFC and FC magnetizations and the hysteresis loops showed typical behaviors of a SFM phase yielding a remanence of 49.2 emu/cm3 and a coercivity of 9.65 kOe at 10 K. The demagnetizing field for $H$ applied transverse to the axis of the sample holder induced an instability that reduced the magnitude of the remanence to 12.7 emu/cm3 and reduced the coercivity to 31 Oe at 10 K. The overall results are explained in terms of macroscopic demagnetizing fields.
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