1 23 Journal of Materials Science: Materials in Electronics ISSN 0957-4522 Volume 26 Number 4 J Mater Sci: Mater Electron (2015) 26:2343-2356 DOI 10.1007/s10854-015-2690-3 Size effect on electrical and magnetic properties of mechanically alloyed CoFe 2 O 4 nanoferrite C. Behera, R. N. P. Choudhary & Piyush R. Das