Magnetic Properties and Magnetocaloric Effect in Gd100-xCox Thin Films
Résumé
We investigated the magnetic and magnetocaloric properties of Gd 100-x Co x (x = 40 to 56) thin films fabricated by the sputtering technique. Under an applied field change ∆H = 20 kOe , the magnetic entropy change (∆S m) decreases from 2.64 Jkg −1 K −1 for x = 44 to about 1.27 Jkg −1 K −1 for x = 56. Increasing the Co concentration from x = 40 to 56 shifts the Curie temperature of Gd 100-x Co x (x = 40 to 56) thin films from 180 K toward 337 K. Moreover, we extracted the values of critical parameters T c , 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 Gd 100-x Co x thin films. Our findings help pave the way toward the enhancement of the magnetocaloric effect in magnetic thin films.
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