Table 3.

The values of coercive field (H_c) and remnant magnetization (${\sigma }_R$) of M1, M2 and magnetite sample.

Sample	${\sigma }_S$ (emu/g)	HC (kOe)	${\sigma }_R$ (emu/g)	${\sigma }_R/{\sigma }_S$
M2	14.06	0.081	1.19	0.084
M1	15.12	0.078	1.30	0.086
Magnetite	71.61	0.125	14.72	0.205