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        Static and Dynamic Magnetic Domains of Epitaxial 0-Fe4N Thin Films

        Shahid Atiq,Saadat Anwar Siddiqi,고현석,신성철 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3

        Highly-ordered single-phase thin films of r'-Fe4N were deposited by dc magnetron sputtering directly on single-crystal MgO(100) substrates at different temperatures. The surface morphology showed that a very regular nano-sized grain structure gradually turned into a smooth layered growth with increasing temperature up to 450 ˚C. The minimum root-mean-square value of the surface roughness was achieved after 30 minutes in-situ annealing at 450 ˚C. The epitaxial texture of the films was revealed by X-ray diffractometry Bi-axial in-plane magnetic anisotropy, characteristic of strong ferromagnetism, was observed from the quite squarish M-H loops obtained with the help of a vibrating sample magnetometer Bow-tieshaped static domain patterns and a very dense domain structure were direct evidence of strong exchange coupling among magnetic domains. Time-resolved dynamic magnetic domain patterns were observed in r'-Fe4N thin films by using a magneto-optic microscope magnetometer. Highly-ordered single-phase thin films of r'-Fe4N were deposited by dc magnetron sputtering directly on single-crystal MgO(100) substrates at different temperatures. The surface morphology showed that a very regular nano-sized grain structure gradually turned into a smooth layered growth with increasing temperature up to 450 ˚C. The minimum root-mean-square value of the surface roughness was achieved after 30 minutes in-situ annealing at 450 ˚C. The epitaxial texture of the films was revealed by X-ray diffractometry Bi-axial in-plane magnetic anisotropy, characteristic of strong ferromagnetism, was observed from the quite squarish M-H loops obtained with the help of a vibrating sample magnetometer Bow-tieshaped static domain patterns and a very dense domain structure were direct evidence of strong exchange coupling among magnetic domains. Time-resolved dynamic magnetic domain patterns were observed in r'-Fe4N thin films by using a magneto-optic microscope magnetometer.

      • KCI등재

        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.

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