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Measurement protocols dependent giant magnetocaloric effect in MnNiSi-based system
S. Ghosh, S. Samanta, , K. Mandal
Published in American Institute of Physics Inc.
2021
Volume: 119
   
Issue: 18
Abstract
MnNiSi-based compounds exhibit giant isothermal magnetic entropy change (ΔSM) across their induced first-order coupled magnetostructural transition (MST) in the vicinity of room temperature, though in most of the cases, the use of Maxwell relation from a very frequently used but incorrect measurement protocol provides a nonphysical spike to the calculated ΔSM. Herein, to realize the accurate measurement protocol, we explore magnetocaloric properties of a (FeCoGa)x doped (MnNiSi)1-x compound with x = 0.165 rigorously. Several methods, including the estimation of ΔSM using Maxwell relation, Clausius-Clapeyron equation, and also from the calorimetry measurement, are discussed explicitly. The studied material is observed to show a MST at 265 K and a giant ΔSM as large as about -29.3 J kg-1 K-1 due to a magnetic field change of 5 T following the Maxwell equation during discontinuous cooling and field increasing mode, which enables the material as a promising candidate for magnetic refrigeration. © 2021 Author(s).
About the journal
JournalApplied Physics Letters
PublisherAmerican Institute of Physics Inc.
ISSN00036951