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Magnetic Properties and Magnetocaloric Effect in Gd100-xCox Thin Films

Laboratoire de Matière Condensée et Sciences Interdisciplinaires (LaMCScI), B.P. 1014, Faculty of Science-Mohammed V University, 11000 Rabat, Morocco
Materials and Nanomaterials Centre, Moroccan Foundation for Advanced Science, Innovation and Reserarch, MAScIR, 11000 Rabat, Morocco
Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine, 54000 Nancy, France
Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
Center for Memory and Recording Research, University of California San Diego, La Jolla, CA 92093-0401, USA
Author to whom correspondence should be addressed.
Crystals 2019, 9(6), 278;
Received: 22 March 2019 / Revised: 10 May 2019 / Accepted: 16 May 2019 / Published: 28 May 2019
(This article belongs to the Special Issue Advances in Caloric Materials)
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We investigated the magnetic and magnetocaloric properties of Gd100-xCox ( x = 40 to 56) thin films fabricated by the sputtering technique. Under an applied field change Δ H = 20 kOe , the magnetic entropy change ( Δ S m ) decreases from 2.64 Jkg−1K−1 for x = 44 to about 1.27 Jkg−1K−1 for x = 56. Increasing the Co concentration from x = 40 to 56 shifts the Curie temperature of Gd100-xCox ( x = 40 to 56) thin films from 180 K toward 337 K. Moreover, we extracted the values of critical parameters Tc, β, γ, and δ by using the modified Arrott plot methods. The results indicate the presence of a long-range ferromagnetic order. More importantly, we showed that the relative cooling power (RCP), which is a key parameter in magnetic refrigeration applications, is strongly enhanced by changing the Co concentration in the Gd100-xCox thin films. Our findings help pave the way toward the enhancement of the magnetocaloric effect in magnetic thin films. View Full-Text
Keywords: magnetocaloric effects (MCE); thin films; universal scaling analysis; critical exponents magnetocaloric effects (MCE); thin films; universal scaling analysis; critical exponents

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Tadout, M.; Lambert, C.-H.; El Hadri, M.S.; Benyoussef, A.; Hamedoun, M.; Benaissa, M.; Mounkachi, O.; Mangin, S. Magnetic Properties and Magnetocaloric Effect in Gd100-xCox Thin Films. Crystals 2019, 9, 278.

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