Investigation of Magnetic Field Response Features of Multilayer CoFe on Kapton Tape

Multilayer magneto-response cells (MMRC) fabricated on a non-magnetic layer among ferromagnetic [Fe65Co35]5/Cu/[Fe65Co35]5 on a flexible substrate (Kapton tape) have been studied by using electron microscopy, X-ray diffraction, magnetic and magnetoimpedance measurements. In a similar cell, these layers have shown previously to have an outstanding magnetoimpedance (MI) effect performance when the selected growth substrate is a rigid one. Here, this MMRC produces on the Kapton tape and evaluate during the using as a magnetic field sensor and the magnetoimpedance characteristics are analyzed in terms of preparation conditions. For future sensing applications, this material is a promising candidate for giant magnetoimpedance effect with the range of low price and relatively high sensitivity features. In order to observe MI effect, the frequency dependence of impedance measurements has performed as a function of the applied low magnetic field. The impedance value of the cells has characterized by using constant 20 mA AC current source at low frequencies ranges. Double (out of plane measurement) peak responses have obtained, showing MI ratios up to % 140 and % 55, their sensitivities are around 30 %/Oe and 17 %/Oe  in the film on Si and Kapton tape, respectively

Unraveling energy consumption by using low-cost and reevaluated thermoelectric Thin Films

WOS: 000585330600003Energy is undoubtedly one of our most important demands whose consumption is constantly increasing and will continue to increase soon. One of the most important factors in attaining the required energy is to provide high efficiency at a low cost with the help of new technological improvements by evaluating wastes. Energy demand could be achieved for a relatively large thermoelectric power value by recycling the Peltier modules from waste ones and adjusting their properties with nanotechnology. For this aim, thermoelectric thin film modules were grown on silicon (Si), glass, and Kapton substrates with thermal evaporation method by using two different BiTeSb/BiTeSe alloy materials which are placed in industrial Peltiers as the p- and n-type semiconductor. the thin films structural and morphological characterizations were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) experiments reveal fine surface with uniformly distributed continuous structure. Seebeck coefficiency (vertical bar S vertical bar) of the substantial modules were investigated by forming certain temperature gradients on them making serial connections using a homemade measurement setup. vertical bar S vertical bar = 143.86 mu V/K is obtained for the thermoelectric module on Si substrate and 44.96 mu V/K and 24.98 mu V/K are calculated for glass and Kapton, respectively.Scientific and Technological Research Council of Turkey-TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [2209-A]This work is supported by the Scientific and Technological Research Council of Turkey-TUBITAK, 2209-A - Research Project Support Program for Undergraduate Students. We would like to thank Remziye Altuntas and Guzin Sevencan for their helpful contribution

Investigation of Magnetic Field Response Features of Multilayer CoFe onKapton Tape

Esnek bir alttaş (Kapton bant) üzerinde manyetik olmayan bir ara katman üzerinde üretilen ferromanyetik [Fe65Co35]5/Cu/[Fe65Co35]5 çok katmanlı manyeto-tepki hücreleri elektron mikroskobu, Xışını kırınımı, manyetik ve magneto empedans ölçümleri alınarak incelenmiştir. Benzer bir hücrede, bu katmanlar, seçilen büyüme altlığı sert bir yapıda olduğu zaman, olağanüstü bir magneto-empedans etki performansına sahip olduklarını göstermiştir. Burada, bu hücreler Kapton bant üzerinde büyütülerek, manyetik alan sensörü olarak kullanımı değerlendirilip ve magneto empedans özellikleri hazırlama koşulları açısından analiz edilmiştir. Gelecekteki algılama uygulamaları için bu malzeme, düşük fiyat aralığı ve nispeten yüksek hassasiyet özellikleri ile dev manyeto-empedans etkisi için umut verici bir adaydır. Manyeto empedans etkisini gözlemlemek için empedans ölçümlerinin frekans bağımlılığı, uygulanan düşük manyetik alanın bir fonksiyonu olarak gerçekleştirilmiştir. Hücrelerin empedans değeri, düşük frekans aralıklarında sabit 20 mA AC akım kaynağı ile karakterize edilmiştir. Si ve Kapton kaplamadaki filmde, duyarlılıkları, sırasıyla,% 30 / Oe ve% 17 / Oe civarında olan, manyeto empedans oranlarını % 140'a ve% 55'e kadar gösteren pik tepkileri elde edilmiştirMultilayer magneto-response cells (MMRC) fabricated on a non-magnetic layer among ferromagnetic [Fe65electron microscopy, X-ray diffraction, magnetic and magnetoimpedance measurements. In a similar cell, these layers have shown previously to have an outstanding magnetoimpedance (MI) effect performance when the selected growth substrate is a rigid one. Here, this MMRC produces on the Kapton tape and evaluate during the using as a magnetic field sensor and the magnetoimpedance characteristics are analyzed in terms of preparation conditions. For future sensing applications, this material is a promising candidate for giant magnetoimpedance effect with the range of low price and relatively high sensitivity features. In order to observe MI effect, the frequency dependence of impedance measurements has performed as a function of the applied low magnetic field. The impedance value of the cells has characterized by using constant 20 mA AC current source at low frequencies ranges. Double (out of plane measurement) peak responses have obtained, showing MI ratios up to % 140 and % 55, their sensitivities are around 30 %/Oe and 17 %/Oe in the film on Si and Kapton tape, respectivel

Role of low substrate temperature deposition on Co-Fe thin films

WOS: 000494821900001This paper presents the role of the conventional and Soliton wave model deposition at low substrate temperature (300-100 K) on the structural, electric and magnetic properties of Co35Fe65 thin films deposited by thermal evaporation using bulk polycrystalline Co35Fe65 alloy. on account of obtaining superior quality magnetic thin films without any high temperature growth processes or heat treatment, the Soliton wave growth model at suitable low temperature range is used. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques are employed to investigate the various structural properties. Morphological and structural analyses of entire 30 nm Co35Fe65 thin films deposited on Si (100) substrate reveal that the stoichiometry is preserved over the whole temperature deposition and BCC crystalline formed with (110) texture. To attain the electrical and magnetic properties, resistivity and vibrating-sample magnetometer (VSM) measurements are evaluated. Soliton wave model deposition significantly increased magnetic anisotropy constant K-1 = 0.105 Merg/cm(3), M-R/M-S = 0.83 and coercivity H-C = 272 Oe at 300 K when the compared to conventional deposition range in this work (K-1 = 0.014 Merg/cm(3), M-R/M-S = 0.6 and H-C = 50 Oe). Growth with novel approach of Co35Fe65 thin films highlights the reasonable low coercivity, the high saturation magnetization, the high magnetic anisotropy and the low electrical resistivity values, with tailored grain size, make them feasible to use in magnetic sensor technology in the near future.Scientific and Technological Research Council of Turkey (TUBITAK) BIDEB-2218-The National Postdoctoral Research Scholarship ProgramTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)G.D.Y. would like to thank the Scientific and Technological Research Council of Turkey (TUBITAK) BIDEB-2218-The National Postdoctoral Research Scholarship Program