Using　the　auto　combustion　flash　method,　Ni1-x+2Mgx+2Fe2+3O4　(x　=　0,　0.2,　0.6,　0.8　and　1)　nano-ferrites　were　synthesized.　All　samples　were　thermally　treated　at　973　K　for　3　h.　The　structural　analysis　for　the　synthesized　samples　was　performed　using　XRD,　high-resolution　transmission　electron　microscopy　(HRTEM),　and　FTIR.　Scanning　electron　microscopy　(SEM)　was　undertaken　to　explore　the　surface　morphology　of　all　the　samples.　The　thermal　stability　of　these　samples　was　investigated　using　thermogravimetric　analysis　(TGA).　XRD　data　show　the　presence　of　a　single　spinel　phase　for　all　the　prepared　samples.　The　intensity　of　the　principal　peak　of　the　spinel　phase　decreases　as　Mg　content　increases,　showing　that　Mg　delays　crystallinity.　The　Mg　content　raised　the　average　grain　size　(D)　from　0.084　mu　m　to　0.1365　mu　m.　TGA　shows　two　stages　of　weight　loss　variation.　The　vibrating　sample　magnetometer　(VSM)　measurement　shows　that　magnetic　parameters,　such　as　initial　permeability　(mu(i))　and　saturation　magnetization　(M-s),　decay　with　rising　Mg　content.　The　permeability　and　magnetic　anisotropy　at　different　frequencies　and　temperatures　were　studied　to　show　the　samples＇　magnetic　behavior　and　determine　the　Curie　temperature　(T-C),　which　depends　on　the　internal　structure.　The　electrical　resistivity　behavior　shows　the　semi-conductivity　trend　of　the　samples.　Finally,　the　dielectric　constant　increases　sharply　at　high　temperatures,　explained　by　the　increased　mobility　of　charge　carriers,　and　decreases　with　increasing　frequency.