Most literatures for magnetocaloric effect, shows magnetic entropy change measured during heating cycle. For NiMnGa system, there is magnetic entropy change during heating (austenite-Martensite) and also during cooling (martensite -austenite). For application point of view, is it the heating cycle important or both.
It is to understand integrity of the material while cycling. From application point of view both the cycles are important.
What system of equations is this system described?
Perhaps this will help you.
It is well known that the entropy depends on the source temperature as in the equation [Delta S= Q/T], the temperature here is the source temperature. Thus even the heat flows from hot receiver to cold body receives are equals, the entropy received by cold receiver is more than that lost from the hot one.
Entropy: A concept that is not a physical quantity
https://www.researchgate.net/publication/230554936_Entropy_A_concept_that_is_not_a_physical_quantity
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