Thermal energy harvesting system based on magnetocaloric materials★ Smail Ahmim, Morgan Almanza, Alexandre Pasko, Frédéric Mazaleyrat and Martino LoBue Eur. Phys. J. Appl. Phys., 85 1 (2019) 10902 Published online: 08 February 2019 DOI: 10.1051/epjap/2019180284