Browsing by Author "Baykul, Mevlana Celalettin"

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    Comparison of Ni-Cu alloy films electrodeposited at low and high pH levels
    (Elsevier Science, 2008-04-03) Koçkar, Hakan; Baykul, Mevlana Celalettin; Alper, Mürsel; Şafak, Mürside; Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Fizik Bölümü.; AAG-8795-2021; 7005719283; 13613646100
    Ni-Cu alloy films were potentiostatically electrodeposited from the electrolytes with low pH (2.0) and high pH (3.3) levels. The structural analysis of the films was carried out using the X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The XRD data showed that the crystal texture degree was different for the films grown at high pH and low pH. At high pH, the films have a strong (100) texture of the face-centred cubic (fcc) structure, while for the films at low pH the crystal planes are randomly oriented, as in a powder pattern of Cu (or Ni). The SEM studies revealed that the surface morphology of the films strongly depend on the electrolyte pH. Furthermore, the magnetic characteristics studied by a vibrating sample magnetometer (VSM) and magnetotransport properties were observed to be affected by the electrolyte pH. The differences observed in the magnetic and magnetotransport properties were attributed to the structural changes caused by the electrolyte pH.
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    Contribution of electrolyte pH and deposition potentials to the magnetic anisotropy of electrodeposited nickel films
    (Elsevier, 2010) Koçkar, Hakan; Karaağaç, Öznur; Nakiboğlu, Nuri; Baykul, Mevlana Celalettin; Alper, Mürsel; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; AAG-8795-2021; 7005719283
    The influence of electrolyte pH and cathode potential on the magnetic properties of single layer Nickel films electrodeposited on polycrystalline titanium substrates was studied. The films were deposited at the electrolyte pH=3.5 +/- 0.1, 2.5 +/- 0.1 and 2.1 +/- 0.1 by varying the deposition potentials (-1.2, -1.5 and -1.8 V vs saturated calomel electrode, SCE) applied in continuous waveform. The structural analysis by X-ray diffraction revealed that the films have face-centred cubic structure. Results of the magnetic measurements obtained by vibrating sample magnetometer (VSM) indicated that the magnetic properties were affected by the electrolyte pH and the cathode potentials in terms of magnetic anisotropy. At the highest pH the films deposited at the lowest potential had in-plane magnetic anisotropy. As the electrolyte pH decreased from the high (pH=3.570.1) to low (pH=2.5 +/- 0.1), which is aided by increasing the potentials, resulted in an almost magnetic isotropy in the films. However, isotropic magnetic behaviour was observed for the film deposited at the low pH combined with the high potential (-1.8 V vs SCE). Magnetic thickness profile of the samples obtained by VSM revealed that the isotropic films have a smoother magnetic variation across the film from one edge than the anisotropic ones. This is also verified with a microscopic observation by an optical microscope and the surface of the isotropic films is observed to be smoother than that of the anisotropic ones. Furthermore, all films were found to have planar magnetic anisotropy irrespective of the pH's and the potentials