Millimeter-Wave Ferromagnetic Resonance of a Saturated Magnetic Transmission Line

Saturated ferrites exhibit microwave and millimeter-wave absorption because they consist of nanomagnetic harmonic oscillators. The absorption frequency and linewidth are dictated by the strength and range of interactions between the magnetic dipoles. The forced orientation of magnetic dipoles along the magnetic bias results in Zeeman splitting in the energy levels. The incoming electromagnetic wave can excite dipoles to transition between these energy levels. In order to investigate the effects of input frequency and Gilbert damping constant on the electromagnetic properties, a magnetic transmission line model is presented for a saturated ferrite. The enhanced power loss during ferromagnetic resonance is contributed to the strong spike of longitudinal magnetic admittance and transverse magnetic impedance.