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    Effect of pH on the magnetoimpedance properties of electrodeposited CoNiFe microtubes
    (Elsevier Science Bv, 2006) Atalay, FE; Kaya, H; Atalay, S
    Cobalt/nickel/iron (CoNiFe) magnetic samples were prepared by electrodeposition onto copper wires with a diameter of 50 pin. The magnetic properties of CoNiFe microtubes were systematically investigated at pH 2-3.5. It was observed that the composition, surface quality and magnetic and magnetoimpedance (MI) properties of the CoNiFe magnetic tubes were strongly affected by the pH of the electrochemical bath. The MI ratio of 123.2% at 160 kHz and a coercivity of 51.5 A/m were obtained for the sample that was produced in the pH 2.4 solution. The energy dispersive X-ray spectrum was also evaluated; this film had a composition of 22.14% Co. 59.94% Ni and 17.92% Fe, with no impurities. (c) 2005 Published by Elsevier B.V.
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    Magnetoimpedance effect in electrochemically etched CoFeSiB amorphous wires
    (Elsevier Science Bv, 2005) Atalay, FE; Atalay, S; Kaya, H; Bahadir, AR
    As-received CoFeSiB amorphous wires with 128 mu m diameter were electrochemically etched at constant voltage to obtain micro magnetoimpedance (MI) sensor. Wires with different diameters from 13 to 100 mu m were obtained at various constant voltage and pH conditions. The diameters and surface properties of the wires were studied by scanning electron microscopy. It was found that the magnitude of the magnetoimpedance effect was first increased and then decreased with decreasing wire diameter. The thinnest wire obtained at pH 4 and 0.4 V, has a diameter of 13 mu m and this wire shows a 4.95% variation in the magnitude of (Delta Z/Z)(%). The results were discussed On the basis of internal stress distribution and a simple magnetic moment rotational model. (c) 2005 Elsevier B.V. All rights reserved.
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    Magnetoimpedance effect in electroplated NiFeRu/Cu wire
    (Iop Publishing Ltd, 2006) Atalay, FE; Kaya, H; Atalay, S
    Magnetoimpedance (MI) and hysteresis loops were studied in electroplated Ni-79.1 Fe-20.9/Cu, Ni75.64Fe24.26Ru0.10/Cu, Ni79.51Fe20.31Ru0.18/Cu and Ni75.99Fe23.66Ru0.34/Cu wires. Scanning electron micrographs showed that crack-free electroplated wires were obtained with a smooth surface. The average grain size varied between 3 and 10 mu m for all samples. It was found that circumferential anisotropy was induced in all samples during the electroplating process. The maximum MI response was 459 % at a frequency of 90 kHz, 361 % at 110 kHz, 157 % at 100 kHz and 114 % at 340 kHz for Ni79.1Fe20.9/Cu, Ni75.64Fe24.26Ru0.10/Cu, Ni79.51Fe20.31Ru0.18/Cu and Ni75.99Fe23.66Ru0.34/Cu wires, respectively.