Unstable antiferromagnetism and large reversible magnetocaloric effect in TmNi2Si2

Based on experimental and theoretical results, the magnetic properties, magnetic phase transitions, and magnetocaloric effect (MCE) of TmNi2Si2 were studied. In this study, we confirmed that unstable antiferromagnetic interaction underwent a field-induced phase transition from meta-magnetic to ferromagnetic under magnetic fields exceeding 0.2 T in TmNi2Si2. Moreover, a large reversible cryogenic MCE was observed. The maximum magnetic entropy change (-?S-M(max)) and refrigeration capacity were found to be 15.4 J kg(-1) K-1 and 68.0 J kg(-1), respectively, when changing the magnetic field from 0 to 2 T. The large reversible MCE observed under the low magnetic field change indicates the potential application of TmNi2Si2 in cryogenic magnetic refrigerators.

Automated summary

Based on experimental and theoretical results, the magnetic properties, magnetic phase transitions, and magnetocaloric effect (MCE) of TmNi2Si2 were studied. It was confirmed that TmNi2Si2 undergoes a field-induced phase transition from meta-magnetic to ferromagnetic under magnetic fields exceeding 0.2 T. A large reversible cryogenic MCE was observed, with a maximum magnetic entropy change (-?S-M(max)) of 15.4 J kg(-1) K-1 and a refrigeration capacity of 68.0 J kg(-1) when changing the magnetic field from 0 to 2 T. The observed reversible MCE under low magnetic field change indicates the potential application of TmNi2Si2 in cryogenic magnetic refrigerators.