MAGNETIC REFRIGERATION MATERIAL AND MAGNETIC REFRIGERATION DEVICE

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Provided is a magnetic refrigeration material that has a Curie temperature equal to or higher than 250K and that drastically exceeds conventional refrigeration performance in a range of up to almost 2 Tesla at which a magnetic field is considered changeable with a permanent magnet. The magnetic refrigeration material is expressed by the formula La1-fREf (Fe1-a-b-c-d-eSiaCobXcYdZe)13 (RE : at least one element among rare earth elements such as Sc and Y, excluding La; X : Ga and/or Al; Y : at least one element selected from among Ge, Sn, B, and C; Z : at least one element selected from among Ti, V, Cr, Mn, Ni, Cu, Zn, and Zr; and 0.03≤a≤0.17, 0.003≤b≤0.06, 0.02≤c≤0.10, 0≤d≤0.04, 0≤e≤0.04, and 0≤f≤0.50). The magnetic refrigeration material exhibits physical properties such as an average crystal grain size between 0.01µm and 3µm, a Curie temperature equal to or higher than 250K, and a maximum value (-∆Smax) of magnetic entropy change (-∆SM) that is equal to or greater than 5J/kgK in response to a change of magnetic field up to 2 Tesla.