1 23 Journal of Superconductivity and Novel Magnetism Incorporating Novel Magnetism ISSN 1557-1939 J Supercond Nov Magn DOI 10.1007/s10948-011-1247-9 Structural, Dielectric, and Magnetic Characterization of Nanocrystalline Ni– Co Ferrites Kishwar Khan, Asghari Maqsood, M. Anis-ur-Rehman, Muhammad Ali Malik & M. Akram