Optimization of the Magnetothermal Properties of LGSMO–MXene–Based Nanocomposite for Magnetic Refrigeration Applications

Kagramanian, Artemy Igorevich; Kanareykin, Egor Alexandrovich; Spichkin, Yury Ivanovich; Ehsani, Mohammad Hossein; Tishin, Alexander Mettalinovich

doi:10.22075/ppam.2026.41822.1245

Optimization of the Magnetothermal Properties of LGSMO–MXene–Based Nanocomposite for Magnetic Refrigeration Applications

Document Type : Original Article

Authors

Artemy Igorevich Kagramanian ¹

Egor Alexandrovich Kanareykin ¹

Yury Ivanovich Spichkin ¹^{, 2}

Mohammad Hossein Ehsani ³

Alexander Mettalinovich Tishin ¹^{, 2}

¹ Moscow Institute of Physics and Technology (MIPT), Institutskiy per. 9, Dolgoprudny, 141701, Moscow Region, Russia

² Lomonosov Moscow State University (MSU), Faculty of Physics, Leninskie Gory, 1, Moscow, 119991, Russia

³ Faculty of Physics, Semnan University, Semnan 35195-363, Iran

10.22075/ppam.2026.41822.1245

Abstract

The optimization of magnetocaloric heat transfer efficiency in a La0.5Gd0.1Sr0.4MnO3 (LGSMO)/Ti3С2Tx MXene composite for solid-state magnetic refrigeration was performed. The effect of the orientation angle α of ellipsoidal LGSMO inclusions relative to the anisotropic MXene matrix and the inclusion aspect ratio λ on the heat removal rate, characterized by the target function J=∆T_ad/τ, where ∆T_ad is the adiabatic temperature rise and τ is the thermal relaxation time, was investigated using the finite element method. For a single grain, the optimal orientation was found at α = 90°, with the major axis aligned in the high-conductivity plane of MXene, and β = 0°, where β is the angle between the major axis and the external magnetic field direction, minimizing the demagnetization factor and maximizing the internal field H_{int}. The analysis was further extended to a fractal hexagonal packing of ellipsoidal grains by introducing an effective target function J_eff = J⋅η, which accounts for the volume fraction η of LGSMO in the composite. The optimal aspect ratio for the packed system was found at λ ≈ 5, balancing the competing effects of improved single-grain heat transfer and reduced packing density at higher λ. The model was further augmented by introducing cylindrical isothermal channels aligned along the high-conductivity direction of the MXene matrix as distributed heat sinks, which shifted the optimal aspect ratio to λ* ≈ 2.3, reflecting the dominant role of grain-to-channel thermal resistance in determining the heat removal efficiency of the active composite.

Keywords

magnetocaloric effect

magnetic refrigration

LGSMO

MXene

ellipsoidal inclusion

aspect ratio optimization

damanetization factor

finite element method

Gaussian process regression

fractal packing

Subjects

Magnetic Materials

© 2026 The Author(s). Progress in Physics of Applied Materials published by Semnan University Press. This is an open access article under the CC-BY 4.0 license. (https://creativecommons.org/licenses/by/4.0/)

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