  We present here the improved crystallographic/geometric compatibility and
magnetocaloric reversibility by measurement of magnetic entropy change using
different protocols in 10% Pt substituted Ni2Mn1.4In0.6 magnetic shape memory
alloy. The substitution of Pt reduces the thermal hysteresis about 50% to the
Ni2Mn1.4In0.6. The origin of the reduced thermal hysteresis is investigated by
the crystallographic compatibility of the austenite and martensite phases. The
calculated middle eigenvalue of the transformation matrix turned out to be
0.9982, which is very close to 1 (deviation is only 0.18%) suggests for the
crystallographic compatibility between the austenite and martensite phases in
Ni1.9Pt0.1Mn1.4In0.6. A very small thermal hysteresis and crystallographic
compatibility between two phases in this alloy system indicate a stress-free
transition layer (i.e. perfect habit plane) between the austenite and
martensite phase, which is expected to give reversible martensite phase
transition and therefore reversible magnetocaloric effect (MCE) as well. The
calculated value of the isothermal entropy change ({\Delta}Siso) using the
magnetization curve under three different measurement protocols (i.e.
isothermal, loop, and isofield measurement protocol) is found to be nearly same
indicating a reversible MCE in the present alloy system. Our work provides a
path to design new magnetic shape memory Heusler alloys for magnetic
refrigeration and also suggest that any of the above measurement protocol can
be used for the calculation of {\Delta}Siso for materials satisfying
geometrical compatibility condition.
