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Open AccessArticle

Magnetic Properties and Magnetocaloric Effect in Gd100-xCox Thin Films

1
Laboratoire de Matière Condensée et Sciences Interdisciplinaires (LaMCScI), B.P. 1014, Faculty of Science-Mohammed V University, 11000 Rabat, Morocco
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Materials and Nanomaterials Centre, Moroccan Foundation for Advanced Science, Innovation and Reserarch, MAScIR, 11000 Rabat, Morocco
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Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine, 54000 Nancy, France
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Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
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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; https://doi.org/10.3390/cryst9060278
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)
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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MDPI and ACS Style

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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