Where did you define frequency parameter? Please do not define “Frequency Sweep” in the setup of the eddy current model.
We could try:
1). Define a parameter for adaptive frequency in solve tab, like Freq_e and do not use Freq that is intrinsic variable.
2). In calculation, we might define max(Temp1) and Freq(All)
We will use Freq_e as input parameter and max(Temp1) as output parameter. We only have one value for Freq(All), so max(Temp1) is just for one frequency that is Freq_e that you specify.