Abstract
Thermal-hysteresis affects adversely the reversibility of the magnetocaloric effect around a first order magnetostructural transition. In Mn3GaC, a first order antiferromagnetic-ferromagnetic transition is accompanied by a volume-change and a 5 K thermal-hysteresis. We study the reversibility of the magnetocaloric effect in the transition region by direct adiabatic temperature-change measurements. The magnetic field is cycled between 0 and 3 T, and the temperature-change is observed. We find that the system exhibits a temperature-change of 3.1 K in the virgin state, and all subsequent cycling leads to a 2.8 K warming and cooling when the field is decreased and increased, respectively.
Keywords
Magnetic refrigeration
Adiabatic process
Antiferromagnetism
Ferromagnetism
Materials science
Condensed matter physics
Hysteresis
Magnetic field
Magnetic hysteresis
Temperature cycling
Thermodynamics
Thermal
Magnetization
Physics
Subject Areas
Thermal Expansion and Ionic Conductivity
·Materials Chemistry ·Physical Sciences
Magnetic and transport properties of perovskites and related materials
·Electronic, Optical and Magnetic Materials ·Physical Sciences
Ferroelectric and Piezoelectric Materials
·Materials Chemistry ·Physical Sciences
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