Nanocomposite of CeO₂ and High-Coercivity Magnetic Carrier with Large Specific Surface Area

Table 2

Magnetic parameters of the samples: temperature of the maximum of the ZFC curve, (range of error ~10 K for nanocomposite samples due to the broad maximum); mean blocking temperature, , obtained from the fit of the ZFC curve with distribution of blocking temperatures (range of error ~2 K); saturation magnetization at 10 and 400 K, and (range of error ~1 Am²/kg); coercivity at 10 K, (range of error ~0.05 T); and effective anisotropy constant, obtained using (1) (range of error ~0.06 × 10⁶ J/m³). Results of the refinement of the curves: mean magnetic moments, , and corresponding mean magnetic particle diameters, .

Sample	(K)	(K)	(Am^2/kg)	(Am^2/kg)	(T)	()	(nm)	(J/m^3)
CoFe_free	~274	180	67.0	45.0	1.12	3.05 ± 0.31	4.4 ± 0.1	1.40
CoFe_mod	~288	211	69.0	47.0	1.08	2.78 ± 0.28	4.3 ± 0.1	1.75
v02	~300	227	7.5	4.6	0.92	2.18 ± 0.22	4.0 ± 0.1	2.33
v03	~310	230	7.8	4.4	0.83	1.83 ± 0.18	3.7 ± 0.1	2.99
v04	~320	228	5.3	3.3	0.84	1.78 ± 0.18	3.7 ± 0.1	2.96
v05	~306	224	8.1	4.1	0.81	2.37 ± 0.24	4.1 ± 0.1	2.14
v06	~308	222	6.8	3.3	0.83	2.56 ± 0.26	4.2 ± 0.1	1.97