1,302 research outputs found
Eigen electric moments of magnetic-dipolar modes in quasi-2D ferrite disk particles
A property associated with a vortex structure becomes evident from an
analysis of confinement phenomena of magnetic oscillations in a quasi-2D
ferrite disk with a dominating role of magnetic-dipolar
(non-exchange-interaction) spectra. The vortices are guaranteed by the chiral
edge states of magnetic-dipolar modes which result in appearance of eigen
electric moments oriented normally to the disk plane. Due to the
eigen-electric-moment properties, a ferrite disk placed in a microwave cavity
is strongly affected by the cavity RF electric field with a clear evidence for
multi-resonance oscillations. For different cavity parameters, one may observe
the "resonance absorption" and "resonance repulsion" behaviors
Handedness of magnetic-dipolar modes in ferrite disks
For magnetic-dipolar modes in a ferrite, components of the magnetic flux
density in a helical coordinate system are dependent on both an orientation of
a gyration vector and a sign of a pitch. It gives four types of helical
harmonics for magnetostatic-potential wave functions in a ferrite disk. Because
of the reflection symmetry breaking, coupling between certain types of helical
harmonics takes place in the reflection points. The reflection feature leads to
exhibition of two types of resonances: the "right" and "left" resonances. These
resonances become coupled for a ferrite disk placed in a homogeneous tangential
RF magnetic field. One also observes such resonance coupling for a ferrite disk
with a symmetrically oriented linear surface electrode, when this ferrite
particle is placed in a homogeneous tangential RF electric field. In a
cylindrical coordinate system handedness of magnetic-dipolar modes in a ferrite
disk is described by spinor wave functions
- …