(Color online) Schematic of the two epitaxial samples under investigation. The La0.56Sr0.44MnO3 alloy sample was grown with the La and Sr simultaneously deposited (left). The [(SMO/LMO)4/LMO]9 digital superlattice (right) has discrete layers containing La and Sr. This layer sequence is repeated 9 times. The total thickness of each sample is 31 nm (81 perovskite unit cells).
(Color online) Samples of isothermal magnetization data of (a) the alloy film and (b) the superlattice between the noted temperatures. The temperature step between each isotherm is 10 K. For clarity, only a fraction of the measured isotherms are shown.
(Color online) Magnetic entropy change results for (a) the alloy film and (b) the superlattice for field changes ranging from 1 T to 6 T in 1 T steps. (c) A comparison of the alloy (open triangles) and superlattice (filled squares) showing that the entropy change responses collapse onto a single curve when analyzed via the universal curve method.
(Color online) Magnetocaloric parameters for the alloy film (triangles) and superlattice (squares). (a) The scaling analysis ΔSm max αHn discussed in the text leads to the noted exponents, n. (b) The relative cooling power for the alloy well behaved, while that of the superlattice is nonlinear.
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