I want to know that what is the basic difference in VNA based FMR(Frequency Swept FMR) and Field Modulation Based FMR (Field Swept FMR) Or in another words Which one is better ?
If you apply this with FMR (or in other words: a YIG filter) both methods work; we use them since >25 years here at cern when I introduced that method for particle accelerator magnets then .You can find related papers via the CERN library (CDS CERN) or just send me an e-mail ([email protected])
As written above, both methods are equivalents. You will get the same characteristics. Here a nice reference which compare all FMR methods (including sweeping field or frequency and their relationship) Article Ferromagnetic resonance linewidth in metallic thin films: Co...