Different Excitation Signal

[Manjushree Maity Res. Scholar, Physics, IIT(BHU)]

  Hello everyone,

 I have a question regarding FMR simulations. If I use different types of RF excitation signals—such as a sinc pulse or a Gaussian pulse—while keeping all other simulation parameters (material, geometry, external field, etc.) the same, will the FMR spectrum be different? Specifically, how does the choice of RF excitation affect the number or nature of resonance modes observed in the spectrum?  

Thank You in advance.

Best regards,

Manju

[Josh Lauzier]

Hi,

Yes, it can affect the spectrum. I don't really know a good source that goes into full detail. Mike Donahue talks a bit about it here: https://youtu.be/_ONM6f_IW-c?t=729

Depending on your excitation, you need to worry about things like aliasing, or normalizing depending on where the excitation delivers the power. (One benefit of a sinc pulse is that it is flat in fourier-space. ie, it excites all modes equally. Other types of excitations might preferentially excite particular frequencies/modes, etc, that you need to worry about).

Best,
Josh L.