Mastering hysteresis in magnetocaloric materials

Abstract

Hysteresis is more than just an interesting oddity, which occurs in materials with a first-order transition. It is a real obstacle on the path from existing lab-scale prototypes of magnetic refrigerators towards commercialization of this potentially disruptive cooling technology. Indeed, the reversibility of the magnetocaloric effect, being essential for magnetic heat pumps, strongly depends on the width of the thermal hysteresis and therefore it is necessary to understand the mechanisms causing hysteresis and to find solutions how to minimize losses associated with thermal hysteresis in order to maximize the efficiency of magnetic cooling devices. In this work, we discuss fundamental aspects, which can contribute to thermal hysteresis and we are developing strategies for at least partially overcoming the hysteresis problem in some selected classes of magnetocaloric materials with large application potential. Doing so, we refer to the most relevant classes of magnetic refrigerants La-Fe-Si-, Heusler- and Fe2P-type compounds.

article submitted to Philosophical Transactions A

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• Comparison of adjustable permanent magnetic field sources
• Microstructural control and tuning of thermal conductivity in La0.67Ca0.33MnO3+/-δ

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• A study on rare-earth Laves phases for magnetocaloric liquefaction of hydrogen
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• Half-metallic Ferromagnets, Spin Gapless Semiconductors, and Topological Semimetals Based on Heusler Alloys
• Designing magnetocaloric materials for hydrogen liquefaction with light rare-earth Laves phases
• The mechanocaloric potential of spin crossover compounds
• Dissipation losses limiting first-order phase transition materials in cryogenic caloric cooling: A case study on all-d-metal Ni(-Co)-Mn-Ti Heusler alloys
• Influence of microstructure on the application of Ni-Mn-In Heusler compounds for multicaloric cooling using magnetic field and uniaxial stress
• High-throughput direct measurement of magnetocaloric effect based on lock-in thermography technique
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• Experimentally correlating thermal hysteresis and phase compatibility in multifunctional Heusler alloys
• Unusual kinetic properties of usual Heusler alloys
• Phase-field modeling of paramagnetic austenite-ferromagnetic martensite transformation coupled with mechanics and micromagnetics
• Moment-volume coupling in La(Fe${}_{1-x}$Si${}_x$)${}_{13}$
• Strain and voltage control of magnetic and electric properties of FeRh films
• Dynamics of the magnetoelastic phase transition and adiabatic temperature change in Mn1.3Fe0.7P0.5Si0.55
• The impact of hysteresis on the electrocaloric effect at first-order phase transitions
• Influence of Gd-rich precipitates on the martensitic transformation, magnetocaloric effect and mechanical properties of Ni-Mn-In Heusler alloys -- A comparative study
• Influence of the martensitic transformation kinetics on the magnetocaloric effect in Ni-Mn-In
• Reactive single-step hot-pressing and magnetocaloric performance of polycrystalline Fe${}_2$Al${}_{1.15-x}$B${}_2$Ge${}_x$Ga${}_x$ ($x=0,0.05$) MAB phases
• Generation and detection of dissipationless spin current in MgO/Si bilayer
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• The role of Debye temperature in achieving large adiabatic temperature changes at cryogenic temperatures: a case study on $P{r}_{2}In$
• Emergence of a hidden magnetic phase in LaFe11.8Si1.2 investigated by inelastic neutron scattering as a function of field and temperature
• Design of thermal hysteresis in nonstoichiometric alloys with giant magnetocaloric effect
• Electric field direction dependence of the electrocaloric effect in BaTiO3
• Mastering disorder in a first-order transition by ion irradiation