Applied Physics Letters · 2009 · 113 citations · 25 references
Natural SciencesMaterials SciencePhysicsEnergy MaterialsMagnetic MaterialsPhase TransformationsFerromagnetic MaterialsFerromagnetismMagnetic Properties Of SolidsMagnetic ThermodynamicsMagnetization ProcessesMagnetocaloric MaterialsHysteresisMagnetic EntropyMagnetic Entropy ChangeMagnetic RefrigerationMagnetocaloric EffectRefrigerant CapacitySpin ReorientationSpin Reorientation Transitions
Intermetallic compound ErGa exhibits two successive magnetic transitions: spin-reorientation transition at TSR=15 K and ferromagnetic-paramagnetic transition at TC=30 K. Both transitions contribute greatly to the magnetic entropy change (ΔSM), each yielding a significant peak on their ΔSM-T curve and thus a considerable value of refrigerant capacity (RC) without hysteresis loss. For a magnetic field change of 5 T, the maximal values of −ΔSM are 21.3 J/kg K at TC and 16.5 J/kg K at TSR, with an RC value of 494 J/kg. Large reversible magnetocaloric effect and RC indicate the potentiality of ErGa as a candidate magnetic refrigerant at low temperatures.
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