Magnetically refrigerating magnetic material, magnetic refrigeration apparatus, and magnetic refrigeration system

A magnetic refrigeration system comprising:

• a magnetic refrigeration apparatus having an AMR bed filled with a magnetic material, magnetic field generation device configured to apply and remove a magnetic field to and from the magnetic material, a low temperature side heat exchanging unit, a high temperature side heat exchanging unit, and a heat transfer fluid path formed by connecting the AMR bed, the low temperature side heat exchanging unit, and the high temperature side heat exchanging unit for circulating a heat transfer fluid, wherein at least a part of the magnetic material is formed of a magnetic material shown by a composition formula of Gd100-x-yZrxYy, wherein 0<x<3.4 and 0≦y≦13.5;
• a cooling unit thermally connected to the low temperature side heat exchanging unit;
• and
• a heat discharge unit thermally connected to the high temperature side heat exchanging unit,
• wherein the low temperature side heat exchanging unit is composed of a low temperature bath for storing a low temperature refrigerant and a low temperature side heat exchanger disposed in the low temperature side bath so as to be in contact with the refrigerant.

A magnetic refrigeration apparatus comprising:

• an AMR bed filled with a first magnetic material;
• a magnetic field generation device configured to apply and remove a magnetic field to and from the first magnetic material;
• a low temperature side heat exchanging unit configured to receive coldness from the AMR bed;
• a high temperature side heat exchanging unit configured to receive heat from the AMR bed;
• and
• a heat transfer fluid path formed by connecting the AMR bed, the low temperature side heat exchanging unit, and the high temperature side heat exchanging unit for circulating a heat transfer fluid,
• wherein at least a part of the first magnetic material is formed of a magnetic material shown by a composition formula of Gd100-x-yZrxYy, wherein 0<x<3.4 and 0≦y≦13.5,
• and wherein the AMR bed is filled with the first magnetic material and a second magnetic material having composition different from the first magnetic material after they are mixed with each other.