Title :
Magnetic Properties and Magnetic Entropy Change in Gd/Ti Multilayers
Author :
Svalov, A.V. ; Vas´kovskiy, V.V. ; Balymov, K.G. ; Alonso, J. ; Fdez-Gubieda, M.L. ; Kurlyandskaya, G.V.
Author_Institution :
Dept. de Electr. y Electron., Univ. del Pais Vasco, Bilbao, Spain
Abstract :
[Gd/Ti]n multilayers with different thicknesses of Gd layers (LGd) have been prepared by magnetron sputtering. These multilayers exhibit second-order phase transitions at different temperatures, which are determined by LGd. The peak value of magnetic entropy change in Gd(300 nm) film is nearly two times smaller than the one of bulk Gd. The decrease of the LGd in the thin film samples leads to a reduction of the maximum value of the magnetic entropy change. Simultaneously, the corresponding full-width at half-maximum increases with LGd decrease. The practical utility of the magnetic layer thickness as control parameter to tune the magnetocaloric properties of materials has been demonstrated.
Keywords :
entropy; gadolinium; magnetic multilayers; magnetic thin films; magnetocaloric effects; metallic thin films; nanofabrication; nanomagnetics; nanostructured materials; solid-state phase transformations; sputter deposition; titanium; Gd layer thicknesses; [Gd-Ti]n; full-width-at-half-maximum; magnetic entropy change; magnetic layer thickness; magnetic properties; magnetocaloric properties; magnetron sputtering; multilayers; second-order phase transitions; size 300 nm; thin film; Entropy; Magnetic multilayers; Magnetization; Nonhomogeneous media; Temperature distribution; Temperature measurement; Magnetic entropy change; magnetic multilayers; nanocrystalline structure; rare earth metals;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2326915
