Correlation between magnetotransport properties and the microstructure of the Co20Cu80 granular alloy |
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| Institution: | 1. LPM, Faculté des Sciences, B.P. 1014, Rabat, Maroc;2. IPCMS-GEMM, CNRS CR 7504, ULP-ECPM, 23 Rue de Loess, F-67037 Strasbourg, France;1. Dipartimento di Ingegneria Industriale, Università degli Sudi di Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy;2. Centro de Ciências Computacionais, Universidade Federal do Rio Grande, Cx.P. 474, Rio Grande, RS 96201-900, Brazil;3. School of Engineering, Universidade Federal do Rio Grande, Cx.P. 474, Rio Grande, RS 96201-900, Brazil;4. Departamento de Engenharia Mecânica, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 425, Porto Alegre, RS 90.050-170, Brazil;1. Department of Physics, NIT Meghalaya, Bijni Campus, Laitumkhrah, Shillong, 793003, Meghalaya, India;2. Department of Physics, IIT Delhi, Hauzkhas, Delhi, 110016, India;1. Institute for High Energy Physics of National Research Center “Kurchatov Institute”, Protvino, Moscow Region, 142281, Russia;2. Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region, 141701, Russia;1. Department of General Thoracic Surgery, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan;2. Department of Radiology, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan;1. Department of Physics, The Pennsylvania State University, University Park, PA 16802, United States;2. H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland |
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| Abstract: | We report on the structural, transport and magnetic properties of Co20Cu80 metallic granular films. The granular films are prepared by ion-beam sputtering at room temperature on glass substrates. The structural properties have been investigated using X-ray diffraction and transmission electron microscopy. Structural characterisation confirmed that the samples consist of fine magnetic particles embedded in the non-magnetic Cu matrix. Giant magnetoresistance (GMR) of 3% is observed at room temperature after annealing at 250°C for 30 min. Detailed structural analysis is performed to understand the origin of the small GMR signal. It is confirmed that this result is directly correlated to the small size, density, and non-uniform distribution of Co particles. |
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