Tuning the magnetocaloric effect by optimizing thickness-induced three-dimensional strain states

The effect of 3-dimensional strain state on the magnetocaloric properties epitaxial La0.8Ca0.2MnO3 (LCMO) thin films grown two types substrates, SrTiO3 (001) (STO) and LaAlO3 (LAO) has been studied as a function film thickness within range 25 to 300 nm. STO substrate imposes an in-plane tensile biaxial while LAO compressive strain. LCMO by gets relaxed more rapidly than that but both LCMO/STO LCMO/LAO show maximum entropy change 12.1 J/Kg-K 3.2 J/Kg-K, respectively at critical 75 nm (at 6 T applied magnetic field). is found exhibit wider transition temperature region with full width half maxima (FWHM) 40 K dM/dT vs curve compared FWHM 33 curve. This broadening indicates Table like (MCE) attainable changing type. Relative Cooling Power, 361 J/Kg 339 also observed Curie varies exploring variation ferromagnetic interaction strength due relaxation. induced lattice are proved be significant parameters for controlling MCE. highest MCE response particular shows possibility tuning in other devices optimizing thickness.