Magnetic Properties and Thermomagnetic Effect in Mn_(0.8)Zn_(0.2)Fe_2O_4/MgAl-LDHs Composite

A magnetic layered inorganic-inorganic composite involving manganese zinc ferrite (Mno.s- Zn_(0.2)Fe_2O_4) and Mg-A1 layered double hydroxides (MgA1-LDHs) was assembled by coprecipitation method.The products were characterized by TEM,FTIR,DTA,XRD and VSM.The results indi- cate that the composite has core-shell structure,the introduction of ferrite particles does not change the typical layered-structure of MgA1-LDHs phase.MgAI-LDHs has infinitely small magnetic shielding effect on ferrite particles,the saturation magnetization values of the composite increase linearly with the ferrite content,however,is the MgA1-LDHs content increasing,the ceorcivity values of the composite de- crease first,then increase subsequently,but these changes are small on the whole.In addition,the LDHs layer also has infinitely small effect on the thermomagnetic effect of ferrite particles.It is obvious that the ferrite content in the composite plays a decisive role on magnetic properties and thermomagnetic effect.