FIELD: refrigeration equipment. SUBSTANCE: working fluid of magnetic refrigerating machine operating in temperature range lower than 30K represents superparamagnetic material on base of magnetic polynuclear complexes of transition metals. Such material features high change value of magnetic part of entropy by action of magnetic field. It provides high efficiency operation of magnetic refrigeration machines in temperature range lower than 30K. EFFECT: enhanced efficiency of refrigerating machines with such working fluid. 4 cl, 1 dwg
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