MAGNETIC REFRIGERATION MATERIAL AND MAGNETIC REFRIGERATION DEVICE

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Provided is a magnetic refrigeration material which has a Curie temperature of not lower than 250 K, and provides refrigeration performance well over that of conventional materials when subjected to a field change up to 2 Tesla, which is assumed to be achievable with a permanent magnet. The magnetic refrigeration material is of a composition represented by the formula La 1-f RE f (Fe 1-a-b-c-d-e Si a Co b X c Y d Z e ) 13 (RE : at least one of rare earth elements including Sc and Y and excluding La; X : Ga and/or Al; Y : at least one of Ge, Sn, B, and C; Z : at least one of Ti, V, Cr, Mn, Ni, Cu, Zn, and Zr; 0.03 ‰¤ a ‰¤ 0.17, 0.003 ‰¤ b ‰¤ 0.06, 0.02 0.03 ‰¤ c ‰¤ 0.10, 0 ‰¤ d ‰¤ 0.04, 0.03 ‰¤ e ‰¤ 0.04, 0 ‰¤ f ‰¤ 0.50), and has an average crystal grain size of not smaller than 0.01 µm and not larger than 3 µm, a Curie temperature of not lower than 250 K, and the maximum (-”S max ) of magnetic entropy change (-”S M ) when subjected to a field change up to 2 Tesla is not less than 5 J/kgK.