In this Brief Report, we report on the observation of a giant positive (inverse) magnetic entropy change (about $28.6\mathrm{J}{\mathrm{K}}^{-1}{\mathrm{kg}}^{-1}$ at $5\mathrm{T}$ magnetic field) below $300\mathrm{K}$ and a modest negative (normal) entropy change (about $6.6\mathrm{J}{\mathrm{K}}^{-1}{\mathrm{kg}}^{-1}$ at $5\mathrm{T}$) above $300\mathrm{K}$ in a ${\mathrm{Ni}}_{50}{\mathrm{Mn}}_{33.13}{\mathrm{In}}_{13.90}$ single crystal. This temperature-dependent entropy change may suggest that both the magnetizing and demagnetizing processes can be employed for cooling.

• Received 7 June 2007

DOI:https://doi.org/10.1103/PhysRevB.76.132403