Simulating a Magneto-caloric effect in Comsol

I have a problem in which i have a permanent magnet. In regards to theory of Magneto-caloric effect, if i pass the magnetic field to the gadolinium(rare earth, lanthanide group in periodic table), there will be an increase of temperature(in Gd) due to magneto-caloric effect and when i remove the magnetic field from the Gadolinium, the temperature decreases and drop below the room temperature. My questions are:
1) I can able to create a block of Gd using the Gd's physical property but how to create a block of permanent magnet in Comsol?
2) Do i need to use a step/ramp function when i want to increase or decrease the temperature in the Gd, due to MCE?

Please advise and thanks in advance.