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Murtaza Saleem,Shahid Atiq,Shahzad Naseem,Saadat A. Siddiqi 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
Synthesis techniques strongly influence the various properties of diluted magnetic semiconductor materials. Auto-combustion and co-precipitation techniques were employed to prepare Zn0.95Ni0.05O samples. X-ray diffraction studies exhibited a phase with a pure wurtzite-type crystal structure in both samples. However, traces of nickel oxide were detected in the sample synthesized with the coprecipitation technique. The structural morphology was studied with scanning electron microscopy. Energy dispersive X-ray analysis confirmed the incorporation of Ni content into the zinc-oxide matrix. The decrease in resistivity with increasing temperature demonstrated a typical semiconducting behavior. Room-temperature ferromagnetism was detected only in the sample synthesized with the auto-combustion technique.
Enhanced Magnetic Moment of Epitaxial Υ´-Fe<sub>4</sub>N Films at Low Temperature
Shahid Atiq,Murtaza Saleem,Shahid M. Ramay,Saadat A. Siddiqi,M. Sabieh Anwar,신성철 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
Ferromagnetic iron nitride has fascinated the researchers owing to its amazing magnetic properties for spintronic applications. We have prepared single phase epitaxial thin films of Υ´-Fe<sub>4</sub>N on single crystal MgO(100) substrates using dc magnetron sputtering. X-ray diffraction revealed that substrate temperature and annealing time were most important parameters for single phase epitaxial growth of the films. Atomic force microscopy and scanning electron microscopy were utilized to investigate the surface morphology of the films. Angle dependent magnetic anisotropy was observed in epitaxial thin films of Υ´-Fe<sub>4</sub>N. A superconducting interference device was utilized to explore the magnetic and electrical behavior of Υ´-Fe<sub>4</sub>N films at low temperatures.