Abstract:
Experimentally obtained magnetic signals for a Fe–O nanocrystalline press compact were fitted using a phenomenological approach.
This method considers the individual properties of microvolumes and their statistics. It also helps avoiding complex calculations
while focusing on local fundamental magnetic characteristics without considering internal processes. Currently, the precise estimation
of internal processes in local areas is nearly impossible. They depend on fluctuations in the anisotropy field, texture degree, and
phase ratio. A cubic compact (103 mm3 volume) was fabricated by pressing magnetite particles mixed with 20% iron by weight in a
high-energy milling machine. After characterizing the compacts by X-ray diffraction (XRD), their magnetic signals were measured
to obtain the saturation magnetization (Ms = 0.97 T), residual magnetization (Mr = 0.456 T), and coercivity (Hc = 0.685 kOe). The
results suggest that the particle anisotropy fields relate to the effective anisotropy constants from the interaction between iron and
magnetite particles. It is also found that single domains formed by iron particles contribute to high coercive states. This confirms
that increasing the degree of texture results in an increment of the relative remanence and coercivity.
