Figure 1

Schematic view of the layered AMR (a) with 16 layers entropy changes with temperature (b). (c) represents the variation of the flow rate (solid line) and the magnetic field (dashed line) during the four steps of the AMR refrigeration cycle, in which τ ₁ = τ ₃ = 0.1τ,and τ ₂ = τ ₄ = 0.4τ. The ramp of the magnetic field lasts 0.5τ _1.