HFSS15: Delta H

Delta H is the full resonance line width at half-maximum, which is measured during a ferromagnetic resonance measurement. It relates to how rapidly a precessional mode in the biased ferrite will damp out when the excitation is removed. The factor DH doesn’t appear in the permeability tensor; instead, the factor a appears. The factor a is computed from

The factor a changes the k and c terms in the permeability tensor from real to complex, which makes the tensor complex non-symmetric (where it had been hermitian for lossless ferrites).

Enter the full resonance line width at half maximum in the Delta H value box. Delta H is measured at a specific frequency. That frequency needs to be entered by the user at the interface. 9.4 GHz is the frequency where Delta H is typically measured.