Magnetocalorics: current situation and future challenges

#magnetic #spin

ABSTRACT

Based on the well-known magnetocaloric effect (MCE), magnetic cooling has attracted worldwide interest due to its efficiency and eco-friendly features [1-5]. By employing magnetocaloric materials, this emergent technology would enable us to fully meet the objectives of several international treaties which aim to eliminate the hazardous fluorinated fluids usually present in conventional refrigerators [1-5]. Additionally, its potential higher thermodynamic efficiency [5] would help to significantly reduce green-house-gas (GHC) emissions and electricity consumption [1-5]. Currently, the expensive and chemically instable gadolinium (Gd)-based alloys are used in the vast majority of magnetocaloric devices [1-5]. To deal with these drawbacks, worldwide investigations were conducted over the last decades leading to the discovery of the so-called giant MCE in numerous materials including particularly Gd₅Ge₂Si₂, MnFe (P, Ge, Si), and La (Fe, Co, Mn)_13-xSi_x(H, C)_y-based compounds [1-4]. Their direct implementation in room-temperature magnetocaloric devices has unveiled encouraging results when compared to the reference Gd metal [1]. However, the mechanical brittleness as well as the chemical instability of these “giant” MCE materials remain serious obstacles behind their industrial implementation since they are expected to experience billions of magnetothermal cycles during the working life of commercial devices. Additionally, the exhibited MCE by above families, particularly in terms of adiabatic temperature change is not sufficient to build competitive magnetic cooling systems. In this context, the research activities on magnetocalorics need to be revolutionized by adopting new approaches and introducing unusual designs for both materials and devices.

In this talk, I will review recent advances in magnetocaloric materials and magnetic cooling. The driving mechanisms behind the magnetocaloric features of materials will be explained. Also, the important challenges faced by magnetocaloric refrigeration will be underlined while presenting some interesting solutions for boosting the research activities on magnetocalorics.

References

[1] Balli, M., Jandl, S., Fournier, P., Kedous-Lebouc, A., Appl. Phys. Rev. 4, 021305 (2017).

[2] V. Franco, J. S. Blazquez, J. J. Ipus, J. Y. Law, L. M. Moreno-Ramirez, and A. Conde, Prog. Mater. Sci. 93, 112 (2018).

[3] Moya, M., Kar-Narayan, S., and Mathur, N. D., Nat. Mater. 13, 439 (2014).

[4] Sandeman, K. G., Scr. Mater. 67, 566 (2012).

[5] Zimm, C. et al. Adv. Cryog. Eng. 43, 1759 (1998)

• Date: 03 Jun 2025
• Time: 12:00 PM UTC to 01:00 PM UTC
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• Campus Artem,
• 2 allée André Guinier,
• Nancy , Lorraine
• France 54011
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• Room Number: Alnot 4-A014,

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• Starts 01 June 2025 10:00 PM UTC
• Ends 02 June 2025 10:00 PM UTC
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