Semnan University Press Progress in Physics of Applied Materials 2783-4794 7 2 2027 07 01 Optimization of the Magnetothermal Properties of LGSMO–MXene–Based Nanocomposite for Magnetic Refrigeration Applications 9 15 10954 10.22075/ppam.2026.41822.1245 EN Artemy Igorevich Kagramanian Moscow Institute of Physics and Technology (MIPT), Institutskiy per. 9, Dolgoprudny, 141701, Moscow Region, Russia Egor Alexandrovich Kanareykin Moscow Institute of Physics and Technology (MIPT), Institutskiy per. 9, Dolgoprudny, 141701, Moscow Region, Russia Yury Ivanovich Spichkin Moscow Institute of Physics and Technology (MIPT), Institutskiy per. 9, Dolgoprudny, 141701, Moscow Region, Russia Lomonosov Moscow State University (MSU), Faculty of Physics, Leninskie Gory, 1, Moscow, 119991, Russia Mohammad Hossein Ehsani Faculty of Physics, Semnan University, Semnan 35195-363, Iran 0000-0002-7169-7496 Alexander Mettalinovich Tishin Moscow Institute of Physics and Technology (MIPT), Institutskiy per. 9, Dolgoprudny, 141701, Moscow Region, Russia Lomonosov Moscow State University (MSU), Faculty of Physics, Leninskie Gory, 1, Moscow, 119991, Russia Journal Article 2026 06 30 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. https://ppam.semnan.ac.ir/article_10954_19ae449792fac7866a7d551fc38c08ed.pdf