Eigenfrequency and Temperature in a Cantilever

Hello,

I'm using COMSOL for some months. I'm simulating the eigenfrequency of a clamped-free beam (cantilever MEMS).
The value of the eigenfrequency at room temperautre is correct (about 6.4MHz) but the increase in temperature produces an increase in the frequency.
Theorically and experimentally, if the temperature rises on the structure, the eigenfrequency decreases.

I tried to solve it including a HT module but there was no change. What is wrong?


Thanks. Kind Regards.
-Francisco

PS I simulated a clamped-clamped beam (bridge) and it worked correctly.