Browsing by Author "Farle, Michael"

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    Narrow transitional hysteresis in (Mn -Cr-Co) 2 Sb pnictides for room-temperature magnetic refrigeration
    (Publishing, 2019-04-10) Tekgül, Atakan; Acet, Mehmet; Scheibel, Franziska; Farle, Michael; Tekgül, Atakan; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; 0000-0001-6737-3838; P-2124-2016
    Mn1.96-xCrxCo0.04Sb with x = 0.05 and 0.09 has been investigated for its magnetocaloric properties using structural, magnetization and calorimetric methods. These compounds exhibit an antiferromagnetic-ferrimagnetic transition of which the temperature can be adjusted by the Cr concentration. The transition temperature is at room temperature for x = 0.09. Magnetocaloric properties are presented as entropy-change and direct temperature-change. We show that these compounds have a narrow transitional hysteresis and exhibit the inverse magnetocaloric effect. We find a nearly hysteresis-free transition with a 2.6 K temperature-change around 287 K making it attractive for magnetic-cooling.
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    The production of Cu nanoparticles on large area graphene by sputtering and in-flight sintering
    (Wiley-V C H, 2017-11) Ünlü, C. Gökhan; Acet, Mehmet; Farle, Michael; Atakan, Şaban; Lindner, Jürgen; Tekgül, Atakan; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0001-6737-3838; P-2124-2016; 37462175100
    We have developed a simple method to synthesize Cu nanoparticles on graphene, which is a composite that is currently investigated for use as biosensors. Firstly, large area graphene (2 x 2 cm(2)) was prepared by chemical vapor deposition on Cu foils and then transferred onto SiO2 substrates by a transfer process. The Cu nanoparticles were collected on graphene/SiO2 by magnetron sputtering. The presence of graphene was verified by optical microscopy and Raman spectroscopy. The structure of graphene decorated with Cu nanoparticles was determined by scanning and transmission electron microscopy. The results show that the Cu nanoparticles acquire a cubic structure on graphene