The paper discusses the inverse magnetocaloric effect (ICE) in ferromagnetic Ni-Mn-Sn alloys, where applying a magnetic field adiabatically causes cooling. This phenomenon is opposite to the conventional magnetocaloric effect, where a magnetic field applied isothermally leads to cooling. The ICE in these alloys is attributed to a martensitic phase transformation that modifies the magnetic exchange interactions due to changes in lattice parameters. The study focuses on alloys with compositions \( x = 0.13 \) and \( x = 0.15 \), where the inverse MCE is observed to be at least three times larger than in other systems. The authors measure the temperature and field dependences of magnetization to analyze the entropy changes induced by the magnetic field. They find that the entropy change \( \Delta S \) is positive in the temperature range \( M_f < T < M_s \) for both samples, with values of about 15 J K\(^{-1}\) kg\(^{-1}\) for \( x = 0.15 \) and 18 J K\(^{-1}\) kg\(^{-1}\) for \( x = 0.13 \). The magnitude of the inverse MCE is comparable to that in giant magnetocaloric materials, suggesting potential applications in room-temperature refrigeration and heat management.The paper discusses the inverse magnetocaloric effect (ICE) in ferromagnetic Ni-Mn-Sn alloys, where applying a magnetic field adiabatically causes cooling. This phenomenon is opposite to the conventional magnetocaloric effect, where a magnetic field applied isothermally leads to cooling. The ICE in these alloys is attributed to a martensitic phase transformation that modifies the magnetic exchange interactions due to changes in lattice parameters. The study focuses on alloys with compositions \( x = 0.13 \) and \( x = 0.15 \), where the inverse MCE is observed to be at least three times larger than in other systems. The authors measure the temperature and field dependences of magnetization to analyze the entropy changes induced by the magnetic field. They find that the entropy change \( \Delta S \) is positive in the temperature range \( M_f < T < M_s \) for both samples, with values of about 15 J K\(^{-1}\) kg\(^{-1}\) for \( x = 0.15 \) and 18 J K\(^{-1}\) kg\(^{-1}\) for \( x = 0.13 \). The magnitude of the inverse MCE is comparable to that in giant magnetocaloric materials, suggesting potential applications in room-temperature refrigeration and heat management.