Influence of <i>Fe</i>@<i>MnAl</i><sub>2</sub><i>O</i><sub>4</sub> and Synthesis of novel Compound <i>Mn</i><sub>0.83</sub><i>Fe</i><sub>0.21</sub><i>Al</i><sub>1.96</sub><i>O</i><sub>4</sub>