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  • Küçük Resim
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    Magnetic and structural characterization of Ni(1-x)Gex thin film
    (Journal of Magnetism and Magnetic Materials, 2015-01-01) kazan, sinan; Kocaman, Bayram; parabaş, adem; yıldız, fikret; aktaş, Bekir
    In this study, the growth and magnetic properties of Ni(1-x)Gex thin films on naturally oxidized Si(100) substrate by a molecular beam epitaxy (MBE) technique were investigated. The surface morphology and structural properties of the thin films were investigated by scanning electron microscopy (SEM) and X-ray diffraction techniques. The magnetic properties of the films were measured by ferromagnetic resonance (FMR) and vibrating sample magnetometer (VSM) techniques. SEM images show that the morphology of the films depends on chemical composition of the films. The analysis of FMR spectra and VSM results shows that the saturation magnetization, coercive field and effective magnetization of Ni(1-x)Gex film decrease with the increase of Ge content up to a certain value (atomic percent of Ge at 9%) which is called critical Ge concentration. The magnetization dynamics and agglomeration of NiGe thin film with varying Ge concentration have been presented for potential application like helical magnetic properties as in FeGe.
  • Küçük Resim
    Öğe
    Synthesis and characterization of Mn and Co codoped ZnO nanoparticles
    (Superlattices and Microstructures, 2015-07-01) Abdullahi, Sabiu Said; Köseoğlu, Yüksel; Güner, Sadık; kazan, sinan; Kocaman, Bayram; Ndikilar, Chifu E.
    MnxCo0.1Zn0.9-xO nanoparticles with different doping concentration (x = 0.0, 0.05, 0.1, 0.15, and 0.2) has been successfully synthesized by microwave assisted combustion synthesis method using urea as a fuel. The structural, morphological, compositional, magnetic and optical properties of these nanoparticles were investigated by X-ray diffraction (XRD), Scanning electron microscopes (FE-SEM JEOL-7001), Energy-dispersive X-ray spectroscopy (EDX), Quantum Design Physical Property Measurement System (PPMS) and UV–visible spectroscopy, respectively. The structural properties showed the formation of single phase Wurtzite structure of ZnO, with the strong diffraction peaks appear in (1 0 0), (0 0 2) and (1 0 1) respectively. The average size of the nanoparticles decreases from 32.65 to 23.69 nm as dopant concentration is increase. Scanning electron microscope (SEM) pictures showed that smaller crystallites have sizes smaller than 100 nm, no phase separation and agglomeration was observed. Moreover, Energy-dispersive X-ray spectroscopy (EDX) confirmed the synthesis results. The magnetic characterization of the samples reveals that the samples showed paramagnetic and ferromagnetic behavior, meanwhile there is no linear variation of magnetic moment with concentration of Mn ion whereby at x = 0.15 the samples show room temperature ferromagnetic behavior with coercive field and remanent magnetization of 47.70 Oe and 1.8 × 10-1 emu/g, respectively. UV–vis spectroscopy results show that the optical band gap of the nanoparticles varies between 3.24 eV and 3.02 eV.