## 3 Results and Discussion
### The Influence of Different Cu and Ni Contents on Magnetic Properties
\begin{table}
\begin{tabular}{l c c c c c} \hline \hline  & **Properties Magnetic** & **Hc** & **Ms** & **Mr** & **B** \\
**Composition** & & **(Oe)** & **(emu/g)** & **(emu/g)** & **(gauss/g)** \\ \hline \multirow{4}{*}{Cu-Zn system} & Cu\({}_{0.5}\)Zn\({}_{0.5}\) & \(-6.05\) & \(15.30\) & \(-0.03\) & \(186.12\) \\  & Cu\({}_{0.6}\)Zn\({}_{0.4}\) & \(-12.48\) & \(18.41\) & \(-0.09\) & \(218.75\) \\  & Cu\({}_{0.7}\)Zn\({}_{0.3}\) & \(-6.23\) & \(24.89\) & \(-0.15\) & \(306.39\) \\  & Cu\({}_{0.8}\)Zn\({}_{0.2}\) & \(-5.87\) & \(22.42\) & \(-0.12\) & \(275.74\) \\  & Cu\({}_{0.9}\)Zn\({}_{0.1}\) & \(-4.25\) & \(1.62\) & \(-0.01\) & \(16.05\) \\  & Cu\({}_{1}\)Fe\({}_{2}\)O\({}_{4}\) & \(0.35\) & \(1.20\) & \(0.00\) & \(15.47\) \\ \hline \multirow{4}{*}{Ni-Zn system} & Ni\({}_{0.2}\)Zn\({}_{0.8}\) & \(-17.14\) & \(6.24\) & \(-0.01\) & \(61.18\) \\  & Ni\({}_{0.3}\)Zn\({}_{0.7}\) & \(-9.35\) & \(1.86\) & \(-0.00\) & \(14.00\) \\ \cline{1-1}  & Ni\({}_{0.36}\)Zn\({}_{0.64}\) & \(-6.91\) & \(11.54\) & \(-0.04\) & \(108.04\) \\ \cline{1-1}  & Ni\({}_{0.5}\)Zn\({}_{0.5}\) & \(-7.16\) & \(50.29\) & \(-0.34\) & \(624.48\) \\ \cline{1-1}  & Ni\({}_{0.64}\)Zn\({}_{0.36}\) & \(-11.23\) & \(34.02\) & \(-0.32\) & \(416.06\) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The hysteresis curve for [M\({}_{x}\)Zn\({}_{1-x}\)] Fe\({}_{2}\)O\({}_{4}\) at different compositions and proportions; Hc: Coercive force; Ms: Saturated magnetization; Mr: Residual magnetization; B: Magnetic flux. The Effect of Sintering Temperature on the Magnetism of [Cu\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\), [Ni\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\) Ferrite  
Figure 5a shows the hysteresis curve of Cu\({}_{0.7}\)Zn\({}_{0.3}\)Fe\({}_{2}\)O\({}_{4}\) at different temperatures, sintered in an air atmosphere at 5 \({}^{\circ}\)C/min, held at a constant temperature for 2 h, and finally furnace-cooled. It can be seen that the worst saturated magnetization occurred at 500 \({}^{\circ}\)C, only 44.56 emu/g. However, as sintering temperature increased, the saturated magnetization also increased. When the sintering temperature reached 900 \({}^{\circ}\)C, the saturated magnetization reached a peak of 58.40 emu/g. For Cu\({}_{0.7}\)Zn\({}_{0.3}\)Fe\({}_{2}\)O\({}_{4}\), the change of the saturated magnetization with the temperature was not as large as that observed for [Mn\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\) and [Ni\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\). Figure 5b shows the hysteresis curve for Ni\({}_{0.5}\)Zn\({}_{0.5}\)Fe\({}_{2}\)O\({}_{4}\) ferrite at different sintering temperatures. It can be seen that the saturated magnetization was worse at 500 \({}^{\circ}\)C: 63.70 M(emu/g). As the sintering temperature increased, the saturated magnetization also increased, and when the sintering temperature reached 900 \({}^{\circ}\)C, the saturated magnetization reached a peak of 91.40 M(emu/g). Above 900 \({}^{\circ}\)C, the saturated magnetization started to decay, and when the sintering temperature reached 1200 \({}^{\circ}\)C, the saturated magnetization was only 69.92 M(emu/g). Table 2 shows the coercive force (Hc), saturated magnetization(Ms), and remanent magnetization (Mr) at different sintering temperatures for [Cu\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\). For Cu\({}_{0.7}\)Zn\({}_{0.3}\)Fe\({}_{2}\)O\({}_{4}\), it can be seen that at different temperatures, the magnetic characteristic and Hc value did not exceed 200 Oe and the Mr value approached zero (soft ferrite had lower remanent magnetization). Therefore, we can be sure that this series of ferrite was composed of soft ferrites. For the magnetic flux of [Cu\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\) at different sintering temperatures, further calculations showed that the magnetic flux (B) increased from 562.99 gauss/g at 500 \({}^{\circ}\)C to 773.41 gauss/g at 700 \({}^{\circ}\)C as the temperature increased.