542
E. Kamenetskii
Fig. 19.5 Electric field distributions on the upper plane of a ferrite disc for the first MDM resonance
at different time phases
Fig. 19.6 The helicity density distributions above and below a ferrite disk at the MDM resonance
at two opposite directions of a bias magnetic field. The electric and magnetic fields outside a
ferrite disk are rotating fields which are not mutually perpendicular. The helicity parameter F is
a pseudoscalar: to come back to the initial stage, one has to combine a reflection in a ferrite-disk
plane and an opposite (time-reversal) rotation about an axis perpendicular to that plane. In a green
region F = 0: the angle between the electric and magnetic fields is 90 ◦
disk. The regions of localization of the active and reactive power flows are different.
While the active power flow is localized at the disk periphery, the reactive power
flow is localized at a central part of the disk. It was shown [69] that above and below
a quasi-2D ferrite disk, the real part of the helicity density (defined by (19.34)) is
related to an imaginary part of the complex power-flow density:
E. Kamenetskii
Fig. 19.5 Electric field distributions on the upper plane of a ferrite disc for the first MDM resonance
at different time phases
Fig. 19.6 The helicity density distributions above and below a ferrite disk at the MDM resonance
at two opposite directions of a bias magnetic field. The electric and magnetic fields outside a
ferrite disk are rotating fields which are not mutually perpendicular. The helicity parameter F is
a pseudoscalar: to come back to the initial stage, one has to combine a reflection in a ferrite-disk
plane and an opposite (time-reversal) rotation about an axis perpendicular to that plane. In a green
region F = 0: the angle between the electric and magnetic fields is 90 ◦
disk. The regions of localization of the active and reactive power flows are different.
While the active power flow is localized at the disk periphery, the reactive power
flow is localized at a central part of the disk. It was shown [69] that above and below
a quasi-2D ferrite disk, the real part of the helicity density (defined by (19.34)) is
related to an imaginary part of the complex power-flow density: