Majid Niaz Akhtar
COMSATS Institute of Information Technology, Pakistan
Majid Niaz Akhtar completed his PhD studies in the field of nanotechnology from Universiti Teknologi PETRONAS (UTP), Malaysia. He has expertise in the field of electromagnetics, material science (Adanced magnetic materials) and RF microwave devices (EM Antenna, Nanodevices). He completed his Masters of Philosophy and Masters of Science in (Applied Physics specialization with industrial Electronics) from Bahauddin Zakariya University, Multan, Pakistan. He has got gold medal awards in his M.Phil and Masters from Bahauddin Zakariya University, Multan. On completion of his Masters studies he has worked as a lecturer in Army Public Degree College, Multan. During his M.Phil studies, he worked as visiting lecturer in Govt. College of Technology, Multan and Bahauddin Zakariya University (BZU), Multan. Working at Bahauddin Zakariya University, he has been involved in conducting basic research in the fields of advanced material science for micrwave absorption and memory storage devices. Currently, he is working in Comsats institute of Technology (CIIT), Lahore as Assistant Professor in Department of Physics.
The influence of Cu-Zn substitution on the structural and morphological characteristics of Ni nanocrystalline ferrites have been discussed in this work. The detailed and systematic magnetic characterizations were also done for Cu-Zn substituted Ni nanoferrites. The nanocrystalline ferrites of Cu-Zn with different compositions were synthesized using sol gel self combustion hybrid method. X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscope (TEM) and Vibrating sample magnetometer (VSM) were used to find out the properties of CuZn substituted nanocrystalline ferrites. Single phase structure of CuZn substituted in Ni nanocrystalline ferrites were investigated for all the samples. Crystallite size, lattice constant and volume of the cell were found to be increased by increasing Cu contents in spinel structure. The better morphology with well organized nanocrystals of CuZn ferrites at x=0 and 1.0 were observed from both FESEM and TEM analysis. The average grain size was 35-46 nm for all prepared nanocrystalline samples. Magnetic properties such as coercivity, saturation, remanence, magnetic squareness, magneto crystalline anisotropy constant (K) and Bohr magneton were measured from the recorded hysterises MH loops. The magnetic saturation and remanence were increased as Cu contents increased. However, coercivity follow the Stoner-Wolforth model except for x=0.6 which may be due to the site occupancy and replacement of Cu contents from octahedral site. The squareness ratio confirms the superparamgentic behaviour of the CuZn substituted in Ni nanocrystalline ferrites. Furthermore, CuZn substituted Ni nanocrystalline ferrites may be suitable for many industrial and domestic applications such as component of transformers, core, switching, and MLCI's due to variety of the soft magnetic characteristics.