The researchers of our project published a theoretical investigation of Ni-Mn-Ga alloys doped by Co and Cu in ferromagnetic and paramagnetic states. This work also shows that obtained energy difference between both states can be use for simple prediction of changes in Curie temperature if doping element is added into the alloy.
http://ieeexplore.ieee.org/document/7933255/?arnumber=7933255
A paper about magnetic ordering of Ni–Mn–Ga(–Co–Cu) alloys was published in IEEE Transaction on Magnetics